# Diseases of the nervous system (G00-G99)Diseases of the nervous system (G00-G99)

    Excludes2: certain conditions originating in the perinatal period (P04-P96)
       certain infectious and parasitic diseases (A00-B99)
       complications of pregnancy, childbirth and the puerperium (O00-O99)
       congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
       endocrine, nutritional and metabolic diseases (E00-E90)
       injury, poisoning and certain other consequences of external causes (S00-T98)
       neoplasms (C00-D48)
       symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    This chapter contains the following blocks:
    G00-G09 Inflammatory diseases of the central nervous system
    G10-G14 Systemic atrophies primarily affecting the central nervous system
    G20-G26 Extrapyramidal and movement disorders
    G30-G32 Other degenerative diseases of the nervous system
    G35-G37 Demyelinating diseases of the central nervous system
    G40-G47 Episodic and paroxysmal disorders
    G50-G59 Nerve, nerve root and plexus disorders
    G60-G64 Polyneuropathies and other disorders of the peripheral nervous system
    G70-G73 Diseases of myoneural junction and muscle
    G80-G83 Cerebral palsy and other paralytic syndromes
    G89-G99 Other disorders of the nervous system
​=Inflammatory diseases of the central nervous system (G00-G09) =

## G00 Bacterial meningitis, not elsewhere classifiedG00 Bacterial meningitis, not elsewhere classified

    Includes bacterial arachnoiditis
       bacterial leptomeningitis
       bacterial meningitis
       bacterial pachymeningitis
    Excludes1: bacterial:
       meningoencephalitis (G04.2)
       meningomyelitis (G04.2)
    G00.0 Hemophilus meningitis
       Meningitis due to Hemophilus influenzae
    G00.1 Pneumococcal meningitis
    G00.2 Streptococcal meningitis
       Use additional code to further identify organism (B95.0-B95.5)
    G00.3 Staphylococcal meningitis
       Use additional code to further identify organism (B95.6-B95.8)
    G00.8 Other bacterial meningitis
       Meningitis due to Escherichia coli
       Meningitis due to Friedl?nder bacillus
       Meningitis due to Klebsiella
       Use additional code to further identify organism (B96.-)
    G00.9 Bacterial meningitis, unspecified
       Meningitis due to gram-negative bacteria, unspecified
       Purulent meningitis NOS
       Pyogenic meningitis NOS
       Suppurative meningitis NOS

## G01 Meningitis in bacterial diseases classified elsewhereG01 Meningitis in bacterial diseases classified elsewhere

    Code first underlying disease
    Excludes1: meningitis (in):
       gonococcal (A54.81)
       leptospirosis (A27.81)
       listeriosis (A32.11)
       Lyme disease (A69.21)
       meningococcal (A39.0)
       neurosyphilis (A52.13)
       tuberculosis (A17.0)
       meningoencephalitis and meningomyelitis in bacterial diseases classified elsewhere (G05)

## G02 Meningitis in other infectious and parasitic diseases classified elsewhereG02 Meningitis in other infectious and parasitic diseases classified elsewhere

    Code first underlying disease, such as:
       poliovirus infection (A80.-)
    Excludes1: ​meningitis (due to):
       candidal (B37.5)
       coccidioidomycosis (B38.4)
       cryptococcal meningitis (B45.1)
       herpesviral [herpes simplex] (B00.3)
       infectious mononucleosis (B27.-2)
       measles (B05.1)
       mumps (B26.1)
       rubella (B06.02)
       varicella [chickenpox] (B01.0)
       zoster (B02.1)
       meningoencephalitis and meningomyelitis in other infectious and parasitic diseases classified elsewhere (G05)

## G03 Meningitis due to other and unspecified causesG03 Meningitis due to other and unspecified causes

    Includes arachnoiditis NOS
       leptomeningitis NOS
       meningitis NOS
       pachymeningitis NOS
    Excludes1: meningoencephalitis (G04.-)
       meningomyelitis (G04.-)
    G03.0 Nonpyogenic meningitis
       Aseptic meningitis
       Nonbacterial meningitis
    G03.1 Chronic meningitis
    G03.2 Benign recurrent meningitis [Mollaret]
    G03.8 Meningitis due to other specified causes
    G03.9 Meningitis, unspecified
       Arachnoiditis (spinal) NOS

## G04 Encephalitis, myelitis and encephalomyelitisG04 Encephalitis, myelitis and encephalomyelitis

    Includes acute ascending myelitis
       meningoencephalitis
       meningomyelitis
    Excludes1: encephalopathy NOS (G93.40)
    Excludes2: acute transverse myelitis (G37.3-)
       alcoholic encephalopathy (G31.2)
       benign myalgic encephalomyelitis (G93.3)
       multiple sclerosis (G35)
       subacute necrotizing myelitis (G37.4)
       toxic encephalitis (G92)
       toxic encephalopathy (G92)
    G04.0 Acute disseminated encephalitis and encephalomyelitis (ADEM)
       Excludes1: acute necrotizing hemorrhagic encephalopathy (G04.3-)
       G04. ​00 Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)
          Acute disseminated encephalitis and encephalomyelitis NOS
          Excludes1: noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81)
             postchickenpox encephalitis (B01.1)
             postmeasles encephalitis (B05.0)
             postmeasles myelitis (B05.1)
       G04.01 Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis
          Encephalitis, postimmunization
          Encephalomyelitis, postimmunization
          Use additional code to identify the vaccine (T50.A-, T50.B-, T50.Z-)
    G04.1 Tropical spastic paraplegia
    G04.2 Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified
    G04.3 Acute necrotizing hemorrhagic encephalopathy
       Excludes1: acute disseminated encephalitis and encephalomyelitis (G04.0-)
       G04.30 Postinfectious acute necrotizing hemorrhagic encephalopathy
          Acute necrotizing hemorrhagic encephalopathy NOS
       G04.31 Postimmunization acute necrotizing hemorrhagic encephalopathy
          Use additional code to identify the vaccine (T50.A-, T50.B-, T50.Z-)
    G04.8 Other encephalitis, myelitis and encephalomyelitis
       G04.81 Other encephalitis and encephalomyelitis
          Noninfectious acute disseminated encephalomyelitis (noninfectious ADEM)
       G04.89 Other myelitis
    G04.9 Encephalitis, myelitis and encephalomyelitis, unspecified
       G04.90 Encephalitis and encephalomyelitis, unspecified
          Ventriculitis (cerebral) NOS
    G04.91 Myelitis, unspecified

## G05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhereG05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere

    Code first underlying disease, such as:
       poliovirus (A80.-)
       suppurative otitis media (H66.01-H66.4)
       trichinellosis (B75)
    Excludes1: encephalitis, myelitis and encephalomyelitis (in):
       adenoviral ( ​A85.1)
       cytomegaloviral (B25.8)
       enteroviral (A85.0)
       herpesviral [herpes simplex] (B00.4)
       listerial (A32.12)
       measles (B05.0)
       meningococcal (A39.81)
       mumps (B26.2)
       postchickenpox (B01.1)
       rubella (B06.01)
       systemic lupus erythematosus (M32.19)
       toxoplasmosis (B58.2)
       congenital (P37.1)
       zoster (B02.0)
       eosinophilic meningoencephalitis (B83.2)
    G05.3 Encephalitis and encephalomyelitis in diseases classified elsewhere
       Meningoencephalitis in diseases classified elsewhere
    G05.4 Myelitis in diseases classified elsewhere
       Meningomyelitis in diseases classified elsewhere
    G06 Intracranial and intraspinal abscess and granuloma
       Use additional code (B95-B97) to identify infectious agent.

## G06.0 Intracranial abscess and granulomaG06.0 Intracranial abscess and granuloma

    Brain [any part] abscess (embolic)
    Cerebellar abscess (embolic)
    Cerebral abscess (embolic)
    Intracranial epidural abscess or granuloma
    Intracranial extradural abscess or granuloma
    Intracranial subdural abscess or granuloma
    Otogenic abscess (embolic)
    Excludes1: tuberculous intracranial abscess and granuloma (A17.81)
    G06.1 Intraspinal abscess and granuloma
       Abscess (embolic) of spinal cord [any part]
       Intraspinal epidural abscess or granuloma
       Intraspinal extradural abscess or granuloma
       Intraspinal subdural abscess or granuloma
       Excludes1: tuberculous intraspinal abscess and granuloma (A17.81)
    G06.2 Extradural and subdural abscess, unspecified

## G07 Intracranial and intraspinal abscess and granuloma in diseases classified elsewhereG07 Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere

    Code first, underlying disease, such as:
       schistosomiasis granuloma of brain (B65.-)
    Excludes1: abscess of brain:
       amebic (A06.6)
       chromomycotic (B43.1)
       gonococcal (A54.82)
       tuberculous ( ​A17.81)
       tuberculoma of meninges (A17.1)

## G08 Intracranial and intraspinal phlebitis and thrombophlebitisG08 Intracranial and intraspinal phlebitis and thrombophlebitis

    Includes septic embolism of intracranial or intraspinal venous sinuses and veins
       septic endophlebitis of intracranial or intraspinal venous sinuses and veins
       septic phlebitis of intracranial or intraspinal venous sinuses and veins
       septic thrombophlebitis of intracranial or intraspinal venous sinuses and veins
       septic thrombosis of intracranial or intraspinal venous sinuses and veins
    Excludes1: intracranial phlebitis and thrombophlebitis complicating:
       abortion, ectopic or molar pregnancy (O00-O07, O08.7)
       pregnancy, childbirth and the puerperium (O22.5, O87.3)
       nonpyogenic intracranial phlebitis and thrombophlebitis (I67.6)
       nonpyogenic intraspinal phlebitis and thrombophlebitis (G95.1)

## G09 Sequelae of inflammatory diseases of central nervous systemG09 Sequelae of inflammatory diseases of central nervous system

    Note: Category G09 is to be used to indicate conditions whose primary classification is to G00-G08 as the cause of sequelae, themselves classifiable elsewhere. The "sequelae" include conditions specified as residuals.
    Code first condition resulting from (sequela) of inflammatory diseases of central nervous system

# Systemic atrophies primarily affecting the central nervous system (G10-G14)Systemic atrophies primarily affecting the central nervous system (G10-G14)
## G10 Huntington's diseaseG10 Huntington's disease

    Includes Huntington's chorea
       Huntington's dementia

## G11 Hereditary ataxiaG11 Hereditary ataxia

    Excludes2: cerebral palsy (G80.-)
       hereditary and idiopathic neuropathy (G60.-)
       metabolic disorders (E70-E90)
    G11.0 Congenital nonprogressive ataxia
    G11.1 Early-onset cerebellar ataxia
       Early-onset cerebellar ataxia with essential tremor
       Early-onset cerebellar ataxia with myoclonus [Hunt's ataxia]
       Early-onset cerebellar ataxia with retained tendon reflexes
       Friedreich's ataxia (autosomal recessive)
       X-linked recessive spinocerebellar ataxia
    G11. ​2 Late-onset cerebellar ataxia
    G11.3 Cerebellar ataxia with defective DNA repair
       Ataxia telangiectasia [Louis-Bar]
       Excludes2: Cockayne's syndrome (Q87.1)
          other disorders of purine and pyrimidine metabolism (E79.-)
          xeroderma pigmentosum (Q82.1)
    G11.4 Hereditary spastic paraplegia
    G11.8 Other hereditary ataxias
    G11.9 Hereditary ataxia, unspecified
       Hereditary cerebellar ataxia NOS
       Hereditary cerebellar degeneration
       Hereditary cerebellar disease
       Hereditary cerebellar syndrome

## G12 Spinal muscular atrophy and related syndromesG12 Spinal muscular atrophy and related syndromes

    G12.0 Infantile spinal muscular atrophy, type I [Werdnig-Hoffman]
    G12.1 Other inherited spinal muscular atrophy
       Adult form spinal muscular atrophy
       Childhood form, type II spinal muscular atrophy
       Distal spinal muscular atrophy
       Juvenile form, type III spinal muscular atrophy [Kugelberg-Welander]
       Progressive bulbar palsy of childhood [Fazio-Londe]
       Scapuloperoneal form spinal muscular atrophy
    G12.2 Motor neuron disease
       G12.20 Motor neuron disease, unspecified
       G12.21 Amyotrophic lateral sclerosis
          Progressive spinal muscle atrophy
       G12.22 Progressive bulbar palsy
       G12.29 Other motor neuron disease
          Familial motor neuron disease
          Primary lateral sclerosis
    G12.8 Other spinal muscular atrophies and related syndromes
    G12.9 Spinal muscular atrophy, unspecified

## G13 Systemic atrophies primarily affecting central nervous system in diseases classified elsewhereG13 Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere

    G13.0 Paraneoplastic neuromyopathy and neuropathy
       Carcinomatous neuromyopathy
       Sensorial paraneoplastic neuropathy [Denny Brown]
       Code first underlying neoplasm (C00-D48)
    G13.1 Other systemic atrophy primarily affecting central nervous system in neoplastic disease
       Paraneoplastic limbic encephalopathy
       Code first underlying neoplasm (C00-D48)
    G13.8 Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere
       Code first underlying disease, such as:
          cerebellar ​ataxia (in):
          hypothyroidism (E03.-)
          myxedematous congenital iodine deficiency (E00.1)

## G14 Postpolio syndromeG14 Postpolio syndrome

    Postpolio myelitic syndrome
    Excludes1: sequelae of poliomyelitis (B91)

# Extrapyramidal and movement disorders (G20-G26)Extrapyramidal and movement disorders (G20-G26)
## G20 Parkinson's diseaseG20 Parkinson's disease

    Includes hemiparkinsonism
       idiopathic Parkinsonism or Parkinson's disease
       paralysis agitans
       Parkinsonism or Parkinson's disease NOS
       primary Parkinsonism or Parkinson's disease
    Excludes1: dementia with Parkinsonism (G31.83)

## G21 Secondary parkinsonismG21 Secondary parkinsonism

    Excludes1: dementia with Parkinsonism (G31.83)
       Huntington's disease (G10)
       Shy-Drager syndrome (G90.3)
       syphilitic Parkinsonism (A52.19)
    G21.0 Malignant neuroleptic syndrome
       Code first (T43.3-T43.5) to identify drug
       Excludes1: neuroleptic induced parkinsonism (G21.11)
    G21.1 Other drug-induced secondary parkinsonism
       G21.11 Neuroleptic induced parkinsonism
          Code first (T43.3-T43.5) to identify drug
          Excludes1: malignant neuroleptic syndrome (G21.0)
       G21.19 Other drug induced secondary parkinsonism
          Code first (T36-T50) to identify drug
    G21.2 Secondary parkinsonism due to other external agents
       Code first (T51-T65) to identify external agent
    G21.3 Postencephalitic parkinsonism
    G21.4 Vascular parkinsonism
    G21.8 Other secondary parkinsonism
    G21.9 Secondary parkinsonism, unspecified

## G23 Other degenerative diseases of basal gangliaG23 Other degenerative diseases of basal ganglia

    Excludes2: multi-system degeneration of the autonomic nervous system (G90.3)
    G23.0 Hallervorden-Spatz disease
       Pigmentary pallidal degeneration
    G23.1 Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
    G23.2 Striatonigral degeneration
    G23. ​8 Other specified degenerative diseases of basal ganglia
       Calcification of basal ganglia
    G23.9 Degenerative disease of basal ganglia, unspecified

## G24 DystoniaG24 Dystonia

    Includes dyskinesia
    Excludes2: athetoid cerebral palsy (G80.3)
    G24.0 Drug induced dystonia
       Code first (T36-T50) to identify drug
       G24.01 Drug induced subacute dyskinesia
          Drug induced blepharospasm
          Drug induced orofacial dyskinesia
          Neuroleptic induced tardive dyskinesia
          Tardive dyskinesia
       G24.02 Drug induced acute dystonia
          Acute dystonic reaction to drugs
          Neuroleptic induced acute dystonia
       G24.09 Other drug induced dystonia
    G24.1 Genetic torsion dystonia
       Dystonia deformans progressiva
       Dystonia musculorum deformans
       Familial torsion dystonia
       Idiopathic familial dystonia
       Idiopathic (torsion) dystonia NOS
       (Schwalbe-) Ziehen-Oppenheim disease
    G24.2 Idiopathic nonfamilial dystonia
    G24.3 Spasmodic torticollis
       Excludes1: congenital torticollis (Q68.0)
          hysterical torticollis (F44.4)
          ocular torticollis (R29.891)
          psychogenic torticollis (F45.8)
          torticollis NOS (M43.6)
          traumatic recurrent torticollis (S13.4)
    G24.4 Idiopathic orofacial dystonia
       Orofacial dyskinesia
       Excludes1: drug induced orofacial dyskinesia (G24.01)
    G24.5 Blepharospasm
       Excludes1: drug induced blepharospasm (G24.01)
    G24.8 Other dystonia
       Acquired torsion dystonia NOS
    G24.9 Dystonia, unspecified
       Dyskinesia NOS

## G25 Other extrapyramidal and movement disordersG25 Other extrapyramidal and movement disorders

    Excludes2: sleep related movement disorders (G47.6-)
    G25.0 Essential tremor
       Familial tremor
       Excludes1: ​tremor NOS (R25.1)
    G25.1 Drug-induced tremor
       Code first (T36-T50) to identify drug
    G25.2 Other specified forms of tremor
       Intention tremor
    G25.3 Myoclonus
       Drug-induced myoclonus
       Palatal myoclonus
       Code first (T36-T50) to identify drug, if drug-induced
       Excludes1: facial myokymia (G51.4)
          myoclonic epilepsy (G40.-)
    G25.4 Drug-induced chorea
       Code first (T36-T50) to identify drug
    G25.5 Other chorea
       Chorea NOS
       Excludes1: chorea NOS with heart involvement (I02.0)
          Huntington's chorea (G10)
          rheumatic chorea (I02.-)
          Sydenham's chorea (I02.-)
    G25.6 Drug induced tics and other tics of organic origin
       G25.61 Drug induced tics
          Code first (T36-T50) to identify drug
       G25.69 Other tics of organic origin
          Excludes1: habit spasm (F95.9)
             tic NOS (F95.9)
             Tourette?s syndrome (F95.2)
    G25.7 Other and unspecified drug induced movement disorders
       Code first (T36-T50) to identify drug
       G25.70 Drug induced movement disorder, unspecified
       G25.71 Drug induced akathisia
          Drug induced acathisia
          Neuroleptic induced acute akathisia
       G25.79 Other drug induced movement disorders
    G25.8 Other specified extrapyramidal and movement disorders
       G25.81 Restless legs syndrome
       G25.82 Stiff-man syndrome
       G25.89 Other specified extrapyramidal and movement disorders
    G25.9 Extrapyramidal and movement disorder, unspecified

## G26 Extrapyramidal and movement disorders in diseases classified elsewhereG26 Extrapyramidal and movement disorders in diseases classified elsewhere

    Code first underlying disease

# Other ​degenerative diseases of the nervous system (G30-G32)
## G30 Alzheimer's diseaseG30 Alzheimer's disease

    Includes Alzheimer's dementia senile and presenile forms
    Use additional code to identify:
       delirium, if applicable (F05)
       dementia with behavioral disturbance (F02.81)
       dementia without behavioral disturbance (F02.80)
       Excludes1: senile degeneration of brain NEC (G31.1)
          senile dementia NOS (F03)
          senility NOS (R41.81)
    G30.0 Alzheimer's disease with early onset
    G30.1 Alzheimer's disease with late onset
    G30.8 Other Alzheimer's disease
    G30.9 Alzheimer's disease, unspecified

## G31 Other degenerative diseases of nervous system, not elsewhere classifiedG31 Other degenerative diseases of nervous system, not elsewhere classified

    Use additional code to identify:
       dementia with behavioral disturbance (F02.81)
       dementia without behavioral disturbance (F02.80)
       Excludes2: Reye's syndrome (G93.7)
    G31.0 Frontotemporal dementia
       G31.01 Pick's disease
          Circumscribed brain atrophy
          Progressive isolated aphasia
       G31.09 Other frontotemporal dementia
          Frontal dementia
    G31.1 Senile degeneration of brain, not elsewhere classified
       Excludes1: Alzheimer's disease (G30.-)
          senility NOS (R41.81)
    G31.2 Degeneration of nervous system due to alcohol
       Alcoholic cerebellar ataxia
       Alcoholic cerebellar degeneration
       Alcoholic cerebral degeneration
       Alcoholic encephalopathy
       Dysfunction of the autonomic nervous system due to alcohol
       Code also associated alcoholism (F10.-)
    G31.8 Other specified degenerative diseases of nervous system
       G31.81 Alpers disease
          Grey-matter degeneration
       G31.82 Leigh's disease
          Subacute necrotizing encephalopathy
       G31.83 Dementia with Lewy bodies
          Dementia ​with Parkinsonism
          Lewy body dementia
          Lewy body disease
       G31.84 Mild cognitive impairment, so stated
          Excludes1: age related cognitive decline (R41.81)
             altered mental status (R41.82)
             cerebral degeneration (G31.9)
             change in mental status (R41.82)
             cognitive deficits following (sequelae of) cerebral hemorrhage or infarction (I69.01, I69.11, I69.21, I69.31, I69.81, I69.91)
             cognitive impairment due to intracranial or head injury (S06.-)
             dementia (F01.-, F02.-, F03)
             mild memory disturbance (F06.8)
             neurologic neglect syndrome (R41.4)
             personality change, nonpsychotic (F68.8)
       G31.89 Other specified degenerative diseases of nervous system
    G31.9 Degenerative disease of nervous system, unspecified

## G32 Other degenerative disorders of nervous system in diseases classified elsewhereG32 Other degenerative disorders of nervous system in diseases classified elsewhere

    G32.0 Subacute combined degeneration of spinal cord in diseases classified elsewhere
       Dana-Putnam syndrome
       Sclerosis of spinal cord (combined) (dorsolateral) (posterolateral)
       Code first underlying disease, such as:
          vitamin B12 deficiency (E53.8)
          anemia (D51.9)
          dietary (D51.3)
          pernicious (D51.0)
       Excludes1: syphilitic combined degeneration of spinal cord (A52.11)
    G32.8 Other specified degenerative disorders of nervous system in diseases classified elsewhere
       Degenerative encephalopathy in diseases classified elsewhere
       Code first underlying disease, such as:
          cerebral degeneration (due to):
          amyloid (E85.-)
          hypothyroidism (E00.-, E03.-)
          neoplasm (C00-D48)
          vitamin B deficiency, except thiamine (E52-E53.-)
       Excludes1: superior hemorrhagic polioencephalitis [Wernicke's encephalopathy] (E51.2)

# Demyelinating ​diseases of the central nervous system (G35-G37)
## G35 Multiple sclerosisG35 Multiple sclerosis

       Includes disseminated multiple sclerosis
          generalized multiple sclerosis
          multiple sclerosis NOS
          multiple sclerosis of brain stem
          multiple sclerosis of cord

## G36 Other acute disseminated demyelinationG36 Other acute disseminated demyelination

    Excludes1: postinfectious encephalitis and encephalomyelitis NOS (G04.020)
    G36.0 Neuromyelitis optica [Devic]
       Demyelination in optic neuritis
       Excludes1: optic neuritis NOS (H46)
    G36.1 Acute and subacute hemorrhagic leukoencephalitis [Hurst]
    G36.8 Other specified acute disseminated demyelination
    G36.9 Acute disseminated demyelination, unspecified

## G37 Other demyelinating diseases of central nervous systemG37 Other demyelinating diseases of central nervous system

    G37.0 Diffuse sclerosis of central nervous system
       Periaxial encephalitis
       Schilder's disease
       Excludes1: X linked adrenoleukodystrophy (E71.42-)
    G37.1 Central demyelination of corpus callosum
    G37.2 Central pontine myelinolysis
    G37.3 Acute transverse myelitis in demyelinating disease of central nervous system
       Acute transverse myelitis NOS
       Acute transverse myelopathy
       Excludes1: multiple sclerosis (G35)
          neuromyelitis optica [Devic] (G36.0)
    G37.4 Subacute necrotizing myelitis of central nervous system
    G37.5 Concentric sclerosis [Balo] of central nervous system
    G37.8 Other specified demyelinating diseases of central nervous system
    G37.9 Demyelinating disease of central nervous system, unspecified

# Episodic and paroxysmal disorders (G40-G47)Episodic and paroxysmal disorders (G40-G47)
## G40 Epilepsy and recurrent seizuresG40 Epilepsy and recurrent seizures

    Note: the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
    Excludes1: ​conversion disorder with seizures (F44.5)
       convulsions NOS (R56.9)
       hippocampal sclerosis (G93.81)
       Landau-Kleffner syndrome (F80.3)
       mesial temporal sclerosis (G93.81)
       seizure (convulsive) NOS (R56.9)
       seizure of newborn (P90)
       temporal sclerosis (G93.81)
       Todd's paralysis (G83.8)
    G40.0 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset
       Benign childhood epilepsy with centrotemporal EEG spikes
       Childhood epilepsy with occipital EEG paroxysms
       Excludes1: adult onset localization-related epilepsy (G40.1-, G40.2-)
       G40.00 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable
          Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset without intractability
          G40.001 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus
          G40.009 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, without status epilepticus
             Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset NOS
       G40.01 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable
          G40.011 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus
          G40.019 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus
    G40.1 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures
       Attacks without alteration of consciousness
       Simple ​partial seizures developing into secondarily generalized seizures
       G40.10 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable
          Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures without intractability
          G40.101 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, with status epilepticus
          G40.109 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, without status epilepticus
             Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures NOS
       G40.11 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable
          G40.111 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, with status epilepticus
          G40.119 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, without status epilepticus
    G40.2 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures
       Attacks with alteration of consciousness, often with automatisms
       Complex partial seizures developing into secondarily generalized seizures
       G40.20 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable
          Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures without intractability
          G40.201 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, with status epilepticus
          G40.209 Localization-related (focal) (partial) symptomatic epilepsy and epileptic
             syndromes ​with complex partial seizures, not intractable, without status epilepticus
             Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures NOS
       G40.21 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable
          G40.211 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, with status epilepticus
          G40.219 Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, without status epilepticus
    G40.3 Generalized idiopathic epilepsy and epileptic syndromes
       Benign myoclonic epilepsy in infancy
       Benign neonatal convulsions (familial)
       Childhood absence epilepsy [pyknolepsy]
       Epilepsy with grand mal seizures on awakening
       Grand mal seizure NOS
       Juvenile absence epilepsy
       Juvenile myoclonic epilepsy [impulsive petit mal]
       Nonspecific atonic epileptic seizures
       Nonspecific clonic epileptic seizures
       Nonspecific myoclonic epileptic seizures
       Nonspecific tonic epileptic seizures
       Nonspecific tonic-clonic epileptic seizures
       Petit mal seizure NOS
       Code also: MERRF syndrome, if applicable, (M88.32)
       G40.30 Generalized idiopathic epilepsy and epileptic syndromes, not intractable
          Generalized idiopathic epilepsy and epileptic syndromes without intractability
          G40.301 Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus
          G40.309 Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus
             Generalized idiopathic epilepsy and epileptic syndromes NOS
       G40.31 Generalized idiopathic epilepsy and epileptic syndromes, intractable
          G40. ​311 Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus
          G40.319 Generalized idiopathic epilepsy and epileptic syndromes, intractable, without status epilepticus
    G40.4 Other generalized epilepsy and epileptic syndromes
       Epilepsy with myoclonic absences
       Epilepsy with myoclonic-astatic seizures
       Infantile spasms
       Lennox-Gastaut syndrome
       Salaam attacks
       Symptomatic early myoclonic encephalopathy
       West's syndrome
       G40.40 Other generalized epilepsy and epileptic syndromes, not intractable
          Other generalized epilepsy and epileptic syndromes without intractability
          Other generalized epilepsy and epileptic syndromes NOS
          G40.401 Other generalized epilepsy and epileptic syndromes, not intractable, with status epilepticus
          G40.409 Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus
       G40.41 Other generalized epilepsy and epileptic syndromes, intractable
          G40.411 Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus
          G40.419 Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus
    G40.5 Special epileptic syndromes
       Epilepsia partialis continua [Kozhevnikof]
       Epileptic seizures related to alcohol
       Epileptic seizures related to drugs
       Epileptic seizures related to hormonal changes
       Epileptic seizures related to sleep deprivation
       Epileptic seizures related to stress
       G40.50 Special epileptic syndromes, not intractable
          Special epileptic syndromes without intractability
          G40.501 Special epileptic syndromes, not intractable, with status epilepticus
          G40. ​509 Special epileptic syndromes, not intractable, without status epilepticus
             Special epileptic syndromes NOS
       G40.51 Special epileptic syndromes, intractable
          G40.511 Special epileptic syndromes, intractable, with status epilepticus
          G40.519 Special epileptic syndromes, intractable, without status epilepticus
    G40.8 Other epilepsy and seizures
       Epilepsies and epileptic syndromes undetermined as to whether they are focal or generalized
       G40.80 Other epilepsy, not intractable
          Other epilepsy without intractability
          G40.801 Other epilepsy, not intractable, with status epilepticus
          G40.809 Other epilepsy, not intractable, without status epilepticus
             Other epilepsy NOS
       G40.81 Other epilepsy, intractable
          G40.811 Other epilepsy, intractable, with status epilepticus
          G40.819 Other epilepsy, intractable, without status epilepticus
       G40.89 Other seizures
          Excludes1: recurrent seizures NOS (G40.909)
             seizure NOS (R56.9)
    G40.9 Epilepsy, unspecified
       G40.90 Epilepsy, unspecified, not intractable
          Epilepsy, unspecified, without intractability
          G40.901 Epilepsy, unspecified, not intractable, with status epilepticus
          G40.909 Epilepsy, unspecified, not intractable, without status epilepticus
             Epilepsy NOS
             Epileptic convulsions NOS
             Epileptic fits NOS
             Epileptic seizures NOS
             Recurrent seizures NOS
       G40.91 Epilepsy, unspecified, intractable
          Intractable seizure disorder NOS
          G40.911 Epilepsy, unspecified, intractable, with status epilepticus
          G40.919 Epilepsy, unspecified, intractable, without status epilepticus

## G43 MigraineG43 Migraine

    Note: ​the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
    Excludes1: headache NOS (R51)
       headache syndromes (G44.-)
       lower half migraine (G44.00)
    G43.0 Migraine without aura
       Common migraine
       Excludes1: chronic migraine without aura (G43.7)
       G43.00 Migraine without aura, not intractable
          G43.001 Migraine without aura, not intractable, with status migrainosus
          G43.009 Migraine without aura, not intractable, without status migrainosus
             Migraine without aura NOS
       G43.01 Migraine without aura, intractable
          G43.011 Migraine without aura, intractable, with status migrainosus
          G43.019 Migraine without aura, intractable, without status migrainosus
    G43.1 Migraine with aura
       Basilar migraine
       Classical migraine
       Migraine equivalents
       Migraine preceded or accompanied by transient focal neurological phenomena
       Migraine triggered seizures
       Migraine with acute-onset aura
       Migraine with aura without headache (migraine equivalents)
       Migraine with prolonged aura
       Migraine with typical aura
       Retinal migraine
       Code also any associated seizure (G40.-, R56.9)
       Excludes1: persistent migraine aura (G43.5-, G43.6-)
       G43.10 Migraine with aura, not intractable
          G43.101 Migraine with aura, not intractable, with status migrainosus
          G43.109 Migraine with aura, not intractable, without status migrainosus
             Migraine with aura NOS
       G43.11 Migraine with aura, intractable
          G43.111 Migraine with aura, intractable, with status migrainosus
          G43.119 Migraine with aura, intractable, without status migrainosus
    G43. ​4 Hemiplegic migraine
       Familial migraine
       Sporadic migraine
       G43.40 Hemiplegic migraine, not intractable
          G43.401 Hemiplegic migraine, not intractable, with status migrainosus
          G43.409 Hemiplegic migraine, not intractable, without status migrainosus
             Hemiplegic migraine NOS
       G43.41 Hemiplegic migraine, intractable
          G43.411 Hemiplegic migraine, intractable, with status migrainosus
          G43.419 Hemiplegic migraine, intractable, without status migrainosus
    G43.5 Persistent migraine aura without cerebral infarction
       G43.50 Persistent migraine aura without cerebral infarction, not intractable
          G43.501 Persistent migraine aura without cerebral infarction, not intractable, with status migrainosus
          G43.509 Persistent migraine aura without cerebral infarction, not intractable, without status migrainosus
             Persistent migraine aura NOS
       G43.51 Persistent migraine aura without cerebral infarction, intractable
          G43.511 Persistent migraine aura without cerebral infarction, intractable, with status migrainosus
          G43.519 Persistent migraine aura without cerebral infarction, intractable, without status migrainosus
    G43.6 Persistent migraine aura with cerebral infarction
       Code also the type of cerebral infarction (I63.-)
       G43.60 Persistent migraine aura with cerebral infarction, not intractable
          G43.601 Persistent migraine aura with cerebral infarction, not intractable, with status migrainosus
          G43.609 Persistent migraine aura with cerebral infarction, not intractable, without status migrainosus
       G43.61 Persistent migraine aura with cerebral infarction, intractable
          G43. ​611 Persistent migraine aura with cerebral infarction, intractable, with status migrainosus
          G43.619 Persistent migraine aura with cerebral infarction, intractable, without status migrainosus
    G43.7 Chronic migraine without aura
       Transformed migraine
       Excludes1: migraine without aura (G43.0-)
       G43.70 Chronic migraine without aura, not intractable
          G43.701 Chronic migraine without aura, not intractable, with status migrainosus
          G43.709 Chronic migraine without aura, not intractable, without status migrainosus
             Chronic migraine without aura NOS
       G43.71 Chronic migraine without aura, intractable
          G43.711 Chronic migraine without aura, intractable, with status migrainosus
          G43.719 Chronic migraine without aura, intractable, without status migrainosus
    G43.a Cyclical vomiting
       G43.a0 Cyclical vomiting, not intractable
          G43.a01 Cyclical vomiting, not intractable, with status migrainosus
          G43.a09 Cyclical vomiting, not intractable, without status migrainosus
             Cyclical vomiting NOS
       G43.a1 Cyclical vomiting, intractable
          G43.a11 Cyclical vomiting, intractable, with status migrainosus
          G43.a19 Cyclical vomiting, intractable, without status migrainosus
    G43.b Ophthalmoplegic migraine
       G43.b0 Ophthalmoplegic migraine, not intractable
          G43.b01 Ophthalmoplegic migraine, not intractable, with status migrainosus
          G43.b09 Ophthalmoplegic migraine, not intractable, without status migrainosus
             Ophthalmoplegic migraine NOS
       G43.b1 Ophthalmoplegic migraine, intractable
          G43.b11 Ophthalmoplegic migraine, intractable, with status migrainosus
          G43.b19 Ophthalmoplegic migraine, intractable, without status migrainosus
    G43.c Periodic headache syndromes in child or adult
       G43. ​c0 Periodic headache syndromes in child or adult, not intractable
          G43.c01 Periodic headache syndromes in child or adult, not intractable, with status migrainosus
          G43.c09 Periodic headache syndromes in child or adult, not intractable, without status migrainosus
             Periodic headache syndromes in child or adult NOS
       G43.c1 Periodic headache syndromes in child or adult, intractable
          G43.c11 Periodic headache syndromes in child or adult, intractable, with status migrainosus
          G43.c19 Periodic headache syndromes in child or adult, intractable, without status migrainosus
    G43.d Menstrual migraine
       Menstrual headache
       Menstrually related migraine
       Pre-menstrual headache
       Pre-menstrual migraine
       Pure menstrual migarine
       Code also associated premenstrual tension syndrome (N94.3)
       G43.d0 Menstrual migraine, not intractable
          G43.d01 Menstrual migraine, not intractable, with status migrainosus
          G43.d09 Menstrual migraine, not intractable, without status migrainosus
             Menstrual migraine NOS
       G43.d1 Menstrual migraine, intractable
          G43.d11 Menstrual migraine, intractable, with status migrainosus
          G43.d19 Menstrual migraine, intractable, without status migrainosus
    G43.8 Other migraine
       G43.80 Other migraine, not intractable
          G43.801 Other migraine, not intractable, with status migrainosus
          G43.809 Other migraine, not intractable, without status migrainosus
       G43.81 Other migraine, intractable
          G43.811 Other migraine, intractable, with status migrainosus
          G43.819 Other migraine, intractable, without status migrainosus
    G43.9 Migraine, unspecified
       G43.90 Migraine, unspecified, not intractable
          G43.901 Migraine, unspecified, not intractable, with status migrainosus
             Status ​migrainosus NOS
          G43.909 Migraine, unspecified, not intractable, without status migrainosus
             Migraine NOS
       G43.91 Migraine, unspecified, intractable
          G43.911 Migraine, unspecified, not intractable, with status migrainosus
          G43.919 Migraine, unspecified, not intractable, without status migrainosus

## G44 Other headache syndromesG44 Other headache syndromes

    Excludes1: headache NOS (R51)
    Excludes2: atypical facial pain (G50.1)
       headache due to lumbar puncture (G97.1)
       migraines (G43.-)
       trigeminal neuralgia (G50.0)
    G44.0 Cluster headaches and other trigeminal autonomic cephalgias (TAC)
       G44.00 Cluster headache syndrome, unspecified
          Ciliary neuralgia
          Cluster headache NOS
          Histamine cephalgia
          Lower half migraine
          Migrainous neuralgia
          G44.001 Cluster headache syndrome, unspecified, intractable
          G44.009 Cluster headache syndrome, unspecified, not intractable
             Cluster headache syndrome NOS
       G44.01 Episodic cluster headache
          G44.011 Episodic cluster headache, intractable
          G44.019 Episodic cluster headache, not intractable
             Episodic cluster headache NOS
       G44.02 Chronic cluster headache
          G44.021 Chronic cluster headache, intractable
          G44.029 Chronic cluster headache, not intractable
             Chronic cluster headache NOS
       G44.03 Episodic paroxysmal hemicrania
          Paroxysmal hemicrania NOS
          G44.031 Episodic paroxysmal hemicrania, intractable
          G44.039 Episodic paroxysmal hemicrania, not intractable
             Episodic paroxysmal hemicrania NOS
       G44.04 Chronic paroxysmal hemicrania
          G44.041 Chronic paroxysmal hemicrania, intractable
          G44. ​049 Chronic paroxysmal hemicrania, not intractable
             Chronic paroxysmal hemicrania NOS
       G44.05 Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT)
          G44.051 Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), intractable
          G44.059 Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), not intractable
             Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT) NOS
       G44.09 Other trigeminal autonomic cephalgias (TAC)
          G44.091 Other trigeminal autonomic cephalgias (TAC), intractable
          G44.099 Other trigeminal autonomic cephalgias (TAC), not intractable
    G44.1 Vascular headache, not elsewhere classified
       G44.10 Vascular headache, not elsewhere classified, not intractable
          Vascular headache NOS
       G44.11 Vascular headache, not elsewhere classified, intractable
    G44.2 Tension-type headache
       G44.20 Tension-type headache, unspecified
          G44.201 Tension-type headache, unspecified, intractable
          G44.209 Tension-type headache, unspecified, not intractable
             Tension headache NOS
       G44.21 Episodic tension-type headache
          G44.211 Episodic tension-type headache, intractable
          G44.219 Episodic tension-type headache, not intractable
             Episodic tension-type headache NOS
       G44.22 Chronic tension-type headache
          G44.221 Chronic tension-type headache, intractable
          G44.229 Chronic tension-type headache, not intractable
             Chronic tension-type headache NOS
    G44.3 Post-traumatic headache
       Code first: postconcussional syndrome (F07.81)
       G44.30 Post-traumatic headache, unspecified
          G44.301 Post-traumatic headache, unspecified, intractable
          G44. ​309 Post-traumatic headache, unspecified, not intractable
             Post-traumatic headache NOS
       G44.31 Acute post-traumatic headache
          G44.311 Acute post-traumatic headache, intractable
          G44.319 Acute post-traumatic headache, not intractable
             Acute post-traumatic headache NOS
       G44.32 Chronic post-traumatic headache
          G44.321 Chronic post-traumatic headache, intractable
          G44.329 Chronic post-traumatic headache, not intractable
             Chronic post-traumatic headache NOS
    G44.4 Drug-induced headache, not elsewhere classified
       Medication overuse headache
       Code first (T36-T50) to identify drug
       G44.40 Drug-induced headache, not elsewhere classified, not intractable
       G44.41 Drug-induced headache, not elsewhere classified, intractable
    G44.5 Complicated headache syndromes
       G44.51 Hemicrania continua
       G44.52 New daily persistent headache (NDPH)
       G44.53 Primary thunderclap headache
       G44.59 Other complicated headache syndrome
    G44.8 Other specified headache syndromes
       G44.81 Hypnic headache
       G44.82 Headache associated with sexual activity
          Orgasmic headache
          Preorgasmic headache
       G44.83 Primary cough headache
       G44.84 Primary exertional headache
       G44.85 Primary stabbing headache
       G44.89 Other headache syndrome

## G45 Transient cerebral ischemic attacks and related syndromesG45 Transient cerebral ischemic attacks and related syndromes

    Excludes1: neonatal cerebral ischemia (P91.0)
       transient retinal artery occlusion (H34.0-)
    G45.0 Vertebro-basilar artery syndrome
    G45.1 Carotid artery syndrome (hemispheric)
    G45.2 Multiple and bilateral precerebral artery syndromes
    G45.3 Amaurosis fugax
    G45.4 Transient global amnesia
       Excludes1: amnesia NOS (R41.3)
    G45.8 Other transient cerebral ischemic attacks and related syndromes
    G45.9 Transient cerebral ischemic attack, unspecified
       Spasm ​of cerebral artery
       TIA
       Transient cerebral ischemia NOS

## G46 Vascular syndromes of brain in cerebrovascular diseasesG46 Vascular syndromes of brain in cerebrovascular diseases

    Code first underlying cerebrovascular disease (I60-I69)
    G46.0 Middle cerebral artery syndrome
    G46.1 Anterior cerebral artery syndrome
    G46.2 Posterior cerebral artery syndrome
    G46.3 Brain stem stroke syndrome
       Benedikt syndrome
       Claude syndrome
       Foville syndrome
       Millard-Gubler syndrome
       Wallenberg syndrome
       Weber syndrome
    G46.4 Cerebellar stroke syndrome
    G46.5 Pure motor lacunar syndrome
    G46.6 Pure sensory lacunar syndrome
    G46.7 Other lacunar syndromes
    G46.8 Other vascular syndromes of brain in cerebrovascular diseases

## G47 Sleep disordersG47 Sleep disorders

    Excludes2: nightmares (F51.5)
       nonorganic sleep disorders (F51.-)
       sleep terrors (F51.4)
       sleepwalking (F51.3)
    G47.0 Insomnia
       Excludes2: alcohol related insomnia (F10.182, F10.282, F10.982)
          drug related insomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
          idiopathic insomnia (F51.01)
          insomnia due to a mental disorder (F51.05)
          insomnia not due to a substance or known physiological condition (F51.0-)
          nonorganic insomnia (F51.0-)
          primary insomnia (F51.01)
          sleep apnea (G47.3-)
       G47.00 Insomnia, unspecified
          Insomnia NOS
       G47.01 Insomnia due to medical condition
          Code also associated medical condition
       G47.09 Other insomnia
    G47.1 Hypersomnia
       Excludes2: alcohol-related hypersomnia (F10.182, F10.282, F10.982)
          drug​related hypersomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
          hypersomnia due to a mental disorder (F51.13)
          hypersomnia not due to a substance or known physiological condition (F51.11)
          primary hypersomnia (F51.11)
          sleep apnea (G47.3-)
       G47.10 Hypersomnia, unspecified
          Hypersomnia NOS
       G47.11 Idiopathic hypersomnia with long sleep time
          Idiopathic hypersomnia NOS
       G47.12 Idiopathic hypersomnia without long sleep time
       G47.13 Recurrent hypersomnia
          Kleine-Levin syndrome
          Menstrual related hypersomnia
       G47.14 Hypersomnia due to medical condition
          Code also associated medical condition
       G47.19 Other hypersomnia
    G47.2 Circadian rhythm sleep disorders
       Disorders of the sleep wake schedule
       Inversion of nyctohemeral rhythm
       Inversion of sleep rhythm
       G47.20 Circadian rhythm sleep disorder, unspecified type
          Sleep wake schedule disorder NOS
       G47.21 Circadian rhythm sleep disorder, delayed sleep phase type
          Delayed sleep phase syndrome
       G47.22 Circadian rhythm sleep disorder, advanced sleep phase type
       G47.23 Circadian rhythm sleep disorder, irregular sleep wake type
          Irregular sleep-wake pattern
       G47.24 Circadian rhythm sleep disorder, free running type
       G47.25 Circadian rhythm sleep disorder, jet lag type
       G47.26 Circadian rhythm sleep disorder, shift work type
       G47.27 Circadian rhythm sleep disorder in conditions classified elsewhere
          Code first underlying condition
       G47.29 Other circadian rhythm sleep disorder
    G47.3 Sleep apnea
       Code also any associated underlying condition
       Excludes1: apnea NOS R06.81
          Cheyne-Stokes breathing (R06.3)
          pickwickian syndrome (E66.2)
          sleep apnea of newborn (P28.3)
       G47. ​30 Sleep apnea, unspecified
          Sleep apnea NOS
       G47.31 Primary central sleep apnea
       G47.32 High altitude periodic breathing
       G47.33 Obstructive sleep apnea (adult) (pediatric)
       G47.34 Idiopathic sleep related nonobstructive alveolar hypoventilation
          Sleep related hypoxia
       G47.35 Congenital central alveolar hypoventilation syndrome
       G47.36 Sleep related hypoventilation in conditions classified elsewhere
          Sleep related hypoxemia in conditions classified elsewhere
          Code first underlying condition
       G47.37 Central sleep apnea in conditions classified elsewhere
          Code first underlying condition
       G47.39 Other sleep apnea
    G47.4 Narcolepsy and cataplexy
       G47.41 Narcolepsy
          G47.411 Narcolepsy with cataplexy
          G47.419 Narcolepsy without cataplexy
             Narcolepsy NOS
       G47.42 Narcolepsy in conditions classified elsewhere
          G47.421 Narcolepsy in conditions classified elsewhere with cataplexy
          G47.429 Narcolepsy in conditions classified elsewhere without cataplexy
    G47.5 Parasomnia
       Excludes1: alcohol induced parasomnia (F10.182, F10.282, F10.982)
          drug induced parasomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
          parasomnia not due to a substance or known physiological condition (F51.8)
       G47.50 Parasomnia, unspecified
          Parasomnia NOS
       G47.51 Confusional arousals
       G47.52 REM sleep behavior disorder
       G47.53 Recurrent isolated sleep paralysis
       G47.54 Parasomnia in conditions classified elsewhere
          Code first underlying condition
       G47.59 Other parasomnia
    G47.6 Sleep related movement disorders
       Excludes2: ​restless legs syndrome (G25.81)
       G47.61 Periodic limb movement disorder
       G47.62 Sleep related leg cramps
       G47.63 Sleep related bruxism
          Excludes1: psychogenic bruxism (F45.8)
       G47.69 Other sleep related movement disorders
    G47.8 Other sleep disorders
    G47.9 Sleep disorder, unspecified
       Sleep disorder NOS

# Nerve, nerve root and plexus disorders (G50-G59)Nerve, nerve root and plexus disorders (G50-G59)

    Excludes1: current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
       neuralgia NOS (M79.2)
       neuritis NOS (M79.2)
       peripheral neuritis in pregnancy (O26.82-)
       radiculitis NOS (M54.1-)

## G50 Disorders of trigeminal nerveG50 Disorders of trigeminal nerve

    Includes disorders of 5th cranial nerve
    G50.0 Trigeminal neuralgia
       Syndrome of paroxysmal facial pain
       Tic douloureux
    G50.1 Atypical facial pain
    G50.8 Other disorders of trigeminal nerve
    G50.9 Disorder of trigeminal nerve, unspecified

## G51 Facial nerve disordersG51 Facial nerve disorders

    Includes disorders of 7th cranial nerve
    G51.0 Bell's palsy
       Facial palsy
    G51.1 Geniculate ganglionitis
       Excludes1: postherpetic geniculate ganglionitis (B02.21)
    G51.2 Melkersson's syndrome
       Melkersson-Rosenthal syndrome
    G51.3 Clonic hemifacial spasm
    G51.4 Facial myokymia
    G51.8 Other disorders of facial nerve
    G51.9 Disorder of facial nerve, unspecified

## G52 Disorders of other cranial nervesG52 Disorders of other cranial nerves

    Excludes2: disorders of acoustic [8th] nerve (H93.3)
       disorders of optic [2nd] nerve (H46, H47.0)
       paralytic strabismus due to nerve palsy (H49.0-H49.2)
    G52.0 Disorders of olfactory nerve
       Disorders ​of 1st cranial nerve
    G52.1 Disorders of glossopharyngeal nerve
       Disorder of 9th cranial nerve
       Glossopharyngeal neuralgia
    G52.2 Disorders of vagus nerve
       Disorders of pneumogastric [10th] nerve
    G52.3 Disorders of hypoglossal nerve
       Disorders of 12th cranial nerve
    G52.7 Disorders of multiple cranial nerves
       Polyneuritis cranialis
    G52.8 Disorders of other specified cranial nerves
    G52.9 Cranial nerve disorder, unspecified

## G53 Cranial nerve disorders in diseases classified elsewhereG53 Cranial nerve disorders in diseases classified elsewhere

    Code first underlying disease, such as:
       neoplasm (C00-D48)
    Excludes1: multiple cranial nerve palsy in sarcoidosis (D86.82)
       multiple cranial nerve palsy in syphilis (A52.15)
       postherpetic geniculate ganglionitis (B02.21)
       postherpetic trigeminal neuralgia (B02.22)

## G54 Nerve root and plexus disordersG54 Nerve root and plexus disorders

    Excludes1: current traumatic nerve root and plexus disorders - see nerve injury by body region
       intervertebral disc disorders (M50-M51)
       neuralgia or neuritis NOS (M79.2)
       neuritis or radiculitis:
       brachial NOS (M54.13)
       lumbar NOS (M54.16)
       lumbosacral NOS (M54.17)
       thoracic NOS (M54.14)
       radiculitis NOS (M54.10)
       radiculopathy NOS (M54.10)
       spondylosis (M47.-)
    G54.0 Brachial plexus disorders
       Thoracic outlet syndrome
    G54.1 Lumbosacral plexus disorders
    G54.2 Cervical root disorders, not elsewhere classified
    G54.3 Thoracic root disorders, not elsewhere classified
    G54.4 Lumbosacral root disorders, not elsewhere classified
    G54.5 Neuralgic amyotrophy
       Parsonage-Aldren-Turner syndrome
       Shoulder-girdle neuritis
       Excludes1: neuralgic amyotrophy in diabetes mellitus (E09-E13 with .44)
    G54.6 Phantom limb syndrome with pain
    G54.7 Phantom limb syndrome without pain
       Phantom limb syndrome NOS
    G54. ​8 Other nerve root and plexus disorders
    G54.9 Nerve root and plexus disorder, unspecified

## G55 Nerve root and plexus compressions in diseases classified elsewhereG55 Nerve root and plexus compressions in diseases classified elsewhere

    Code first underlying disease, such as:
       neoplasm (C00-D48)
    Excludes1: nerve root compression (due to) (in):
       ankylosing spondylitis (M45.-)
       dorsopathies (M53.-, M54.-)
       intervertebral disc disorders (M50.1.-, M51.1.-)
       spondylopathies (M46.-, M48.-)
       spondylosis (M47.0-M47.2.-)

## G56 Mononeuropathies of upper limbG56 Mononeuropathies of upper limb

    Excludes1: current traumatic nerve disorder - see nerve injury by body region
    G56.0 Carpal tunnel syndrome
       G56.00 Carpal tunnel syndrome, unspecified side
       G56.01 Carpal tunnel syndrome, right side
       G56.02 Carpal tunnel syndrome, left side
    G56.1 Other lesions of median nerve
       G56.10 Other lesions of median nerve, unspecified side
       G56.11 Other lesions of median nerve, right side
       G56.12 Other lesions of median nerve, left side
    G56.2 Lesion of ulnar nerve
       Tardy ulnar nerve palsy
       G56.20 Lesion of ulnar nerve, unspecified side
       G56.21 Lesion of ulnar nerve, right side
       G56.22 Lesion of ulnar nerve, left side
    G56.3 Lesion of radial nerve
       G56.30 Lesion of radial nerve, unspecified side
       G56.31 Lesion of radial nerve, right side
       G56.32 Lesion of radial nerve, left side
    G56.4 Causalgia of upper limb
       Complex regional pain syndrome II of upper limb
       Excludes1: complex regional pain syndrome I of lower limb (G90.52-)
          complex regional pain syndrome I of upper limb (G90.51-)
          complex regional pain syndrome II of lower limb (G57.7-)
          reflex sympathetic dystrophy of lower limb (G90.52-)
          reflex sympathetic dystrophy of upper limb (G90.51-)
       G56.40 Causalgia of upper limb, unspecified side
       G56.41 Causalgia of upper limb, right side
       G56.42 Causalgia of upper limb, left side
    G56.8 Other mononeuropathies of upper limb
       Interdigital neuroma of upper limb
       G56.80 Other mononeuropathies of upper limb, unspecified side
       G56. ​81 Other mononeuropathies of upper limb, right side
       G56.82 Other mononeuropathies of upper limb, left side
    G56.9 Mononeuropathy of upper limb, unspecified
       G56.90 Mononeuropathy of upper limb, unspecified, unspecified side
       G56.91 Mononeuropathy of upper limb, unspecified, right side
       G56.92 Mononeuropathy of upper limb, unspecified, left side

## G57 Mononeuropathies of lower limbG57 Mononeuropathies of lower limb

    Excludes1: current traumatic nerve disorder - see nerve injury by body region
    G57.0 Lesion of sciatic nerve
       Excludes1: sciatica NOS (M54.3-)
       Excludes2: sciatica attributed to intervertebral disc disorder (M51.1.-)
       G57.00 Lesion of sciatic nerve, unspecified side
       G57.01 Lesion of sciatic nerve, right side
       G57.02 Lesion of sciatic nerve, left side
    G57.1 Meralgia paresthetica
       Lateral cutaneous nerve of thigh syndrome
       G57.10 Meralgia paresthetica, unspecified side
       G57.11 Meralgia paresthetica, right side
       G57.12 Meralgia paresthetica, left side
    G57.2 Lesion of femoral nerve
       G57.20 Lesion of femoral nerve, unspecified side
       G57.21 Lesion of femoral nerve, right side
       G57.22 Lesion of femoral nerve, left side
    G57.3 Lesion of lateral popliteal nerve
       Peroneal nerve palsy
       G57.30 Lesion of lateral popliteal nerve, unspecified side
       G57.31 Lesion of lateral popliteal nerve, right side
       G57.32 Lesion of lateral popliteal nerve, left side
    G57.4 Lesion of medial popliteal nerve
       G57.40 Lesion of medial popliteal nerve, unspecified side
       G57.41 Lesion of medial popliteal nerve, right side
       G57.42 Lesion of medial popliteal nerve, left side
    G57.5 Tarsal tunnel syndrome
       G57.50 Tarsal tunnel syndrome, unspecified side
       G57.51 Tarsal tunnel syndrome, right side
       G57.52 Tarsal tunnel syndrome, left side
    G57.6 Lesion of plantar nerve
       Morton's metatarsalgia
       G57.60 Lesion of plantar nerve, unspecified side
       G57.61 Lesion of plantar nerve, right side
       G57.62 Lesion of plantar nerve, left side
    G57.7 Causalgia of lower limb
       Complex regional pain syndrome II of lower limb
       Excludes1: complex regional pain syndrome I of lower limb (G90.52-)
          complex regional pain syndrome I of upper limb (G90.51-)
          complex ​regional pain syndrome II of upper limb (G56.4-)
          reflex sympathetic dystrophy of lower limb (G90.52-)
          reflex sympathetic dystrophy of upper limb (G90.51-)
       G57.70 Causalgia of lower limb, unspecified side
       G57.71 Causalgia of lower limb, right side
       G57.72 Causalgia of lower limb, left side
    G57.8 Other mononeuropathies of lower limb
       Interdigital neuroma of lower limb
       G57.80 Other mononeuropathies of lower limb, unspecified side
       G57.81 Other mononeuropathies of lower limb, right side
       G57.82 Other mononeuropathies of lower limb, left side
    G57.9 Mononeuropathy of lower limb, unspecified
       G57.90 Mononeuropathy of lower limb, unspecified, unspecified side
       G57.91 Mononeuropathy of lower limb, unspecified, right side
       G57.92 Mononeuropathy of lower limb, unspecified, left side

## G58 Other mononeuropathiesG58 Other mononeuropathies

    G58.0 Intercostal neuropathy
    G58.7 Mononeuritis multiplex
    G58.8 Other specified mononeuropathies
    G58.9 Mononeuropathy, unspecified

## G59 Mononeuropathy in diseases classified elsewhereG59 Mononeuropathy in diseases classified elsewhere

    Code first underlying disease
    Excludes1: diabetic mononeuropathy (E09-E14 with .41)
       syphilitic nerve paralysis (A52.19)
       syphilitic neuritis (A52.15)
       tuberculous mononeuropathy (A17.83)

# Polyneuropathies and other disorders of the peripheral nervous system (G60-G64)Polyneuropathies and other disorders of the peripheral nervous system (G60-G64)

    Excludes1: neuralgia NOS (M79.2)
       neuritis NOS (M79.2)
       peripheral neuritis in pregnancy (O26.82-)
       radiculitis NOS (M54.10)

## G60 Hereditary and idiopathic neuropathyG60 Hereditary and idiopathic neuropathy

    G60.0 Hereditary motor and sensory neuropathy
       Charcot-Marie-Tooth disease
       Déjérine-Sottas disease
       Hereditary motor and sensory neuropathy, types I-IV
       Hypertrophic neuropathy of infancy
       Peroneal muscular atrophy (axonal type) (hypertrophic type)
       Roussy​Levy syndrome
    G60.1 Refsum's disease
       Infantile Refsum disease
    G60.2 Neuropathy in association with hereditary ataxia
    G60.3 Idiopathic progressive neuropathy
    G60.8 Other hereditary and idiopathic neuropathies
       Dominantly inherited sensory neuropathy
       Morvan's disease
       Nelaton's syndrome
       Recessively inherited sensory neuropathy
    G60.9 Hereditary and idiopathic neuropathy, unspecified

## G61 Inflammatory polyneuropathyG61 Inflammatory polyneuropathy

    G61.0 Guillain-Barre syndrome
       Acute (post-)infective polyneuritis
       Miller Fisher Syndrome
    G61.1 Serum neuropathy
       Code first (T50.9-) to identify serum
    G61.8 Other inflammatory polyneuropathies
       G61.81 Chronic inflammatory demyelinating polyneuritis
       G61.89 Other inflammatory polyneuropathies
    G61.9 Inflammatory polyneuropathy, unspecified

## G62 Other and unspecified polyneuropathiesG62 Other and unspecified polyneuropathies

    G62.0 Drug-induced polyneuropathy
       Code first (T36-T50) to identify drug
    G62.1 Alcoholic polyneuropathy
    G62.2 Polyneuropathy due to other toxic agents
       Code first (T51-T65) to identify toxic agent.
    G62.8 Other specified polyneuropathies
       G62.81 Critical illness polyneuropathy
          Acute motor neuropathy
       G62.82 Radiation-induced polyneuropathy
          Use additional external cause code (W88-W90, X39.0-) to identify cause
       G62.89 Other specified polyneuropathies
    G62.9 Polyneuropathy, unspecified
       Neuropathy NOS

## G63 Polyneuropathy in diseases classified elsewhereG63 Polyneuropathy in diseases classified elsewhere

    Code first underlying disease, such as:
       amyloidosis (E85.-)
       endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34)
       metabolic diseases (E70-E89)
       neoplasm (C00-D48)
       nutritional deficiency (E40-E64)
    Excludes1: polyneuropathy (in):
       diabetes ​mellitus (E09-E13 with .42)
       diphtheria (A36.83)
       infectious mononucleosis (B27.0-B27.9 with 1)
       Lyme disease (A69.22)
       mumps (B26.84)
       postherpetic (B02.23)
       rheumatoid arthritis (M05.33)
       scleroderma (M34.83)
       systemic lupus erythematosus (M32.19)

## G64 Other disorders of peripheral nervous systemG64 Other disorders of peripheral nervous system

    Disorder of peripheral nervous system NOS

## G65 Sequelae of inflammatory and toxic polyneuropathiesG65 Sequelae of inflammatory and toxic polyneuropathies

    Code first condition resulting from (sequela) of inflammatory and toxic polyneuropathies
    G65.0 Sequelae of Guillain-Barr? syndrome
    G65.1 Sequelae of other inflammatory polyneuropathy
    G65.2 Sequelae of toxic polyneuropathy

# Diseases of myoneural junction and muscle (G70-G73)Diseases of myoneural junction and muscle (G70-G73)
## G70 Myasthenia gravis and other myoneural disordersG70 Myasthenia gravis and other myoneural disorders

    Excludes1: botulism (A05.1, A48.51- A48.52)
       transient neonatal myasthenia gravis (P94.0)
    G70.0 Myasthenia gravis
       G70.00 Myasthenia gravis without (acute) exacerbation
          Myasthenia gravis NOS
       G70.01 Myasthenia gravis with (acute) exacerbation
          Myasthenia gravis in crisis
    G70.1 Toxic myoneural disorders
       Code first (T51-T65) to identify toxic agent.
    G70.2 Congenital and developmental myasthenia
    G70.8 Other specified myoneural disorders
    G70.9 Myoneural disorder, unspecified

## G71 Primary disorders of musclesG71 Primary disorders of muscles

    Excludes2: arthrogryposis multiplex congenita (Q74.3)
       metabolic disorders (E70-E90)
       myositis (M60.-)
    G71.0 Muscular dystrophy
       Autosomal recessive, childhood type, muscular dystrophy resembling Duchenne or Becker muscular dystrophy
       Benign [Becker] muscular dystrophy
       Benign scapuloperoneal muscular dystrophy with early contractures [Emery-Dreifuss]
       Distal ​muscular dystrophy
       Facioscapulohumeral muscular dystrophy
       Limb-girdle muscular dystrophy
       Ocular muscular dystrophy
       Oculopharyngeal muscular dystrophy
       Scapuloperoneal muscular dystrophy
       Severe [Duchenne] muscular dystrophy
       Excludes1: congenital muscular dystrophy NOS (G71.2)
          congenital muscular dystrophy with specific morphological abnormalities of the muscle fiber (G71.2)
    G71.1 Myotonic disorders
       G71.11 Myotonic muscular dystrophy
          Dystrophia myotonica [Steinert]
          Myotonia atrophica
          Myotonic dystrophy
          Proximal myotonic myopathy (PROMM)
          Steinert disease
       G71.12 Myotonia congenita
          Acetazolamide responsive myotonia congenita
          Dominant myotonia congenita [Thomsen disease]
          Myotonia levior
          Recessive myotonia congenita [Becker disease]
       G71.13 Myotonic chondrodystrophy
          Chondrodystrophic myotonia
          Congenital myotonic chondrodystrophy
          Schwartz-Jampel disease
       G71.14 Drug induced myotonia
          Code first (T36-T50) to identify drug
       G71.19 Other specified myotonic disorders
          Myotonia fluctuans
          Myotonia permanens
          Neuromyotonia [Isaacs]
          Paramyotonia congenita (of von Eulenburg)
          Pseudomyotonia
          Symptomatic myotonia
    G71.2 Congenital myopathies
       Central core disease
       Congenital muscular dystrophy NOS
       Congenital muscular dystrophy with specific morphological abnormalities of the muscle fiber
       Fiber-type disproportion
       Minicore disease
       Multicore disease
       Myotubular (centronuclear) myopathy
       Nemaline myopathy
       Excludes1: arthrogryposis multiplex congenita (Q74.3)
    G71. ​3 Mitochondrial myopathy, not elsewhere classified
       Excludes1: Kearns-Sayre syndrome (H49.81)
          Leber's disease (H47.21)
          Leigh's encephalopathy (G31.82)
          mitochondrial metabolism disorders (E88.4.-)
          Reye's syndrome (G93.7)
    G71.8 Other primary disorders of muscles
    G71.9 Primary disorder of muscle, unspecified
       Hereditary myopathy NOS

## G72 Other and unspecified myopathiesG72 Other and unspecified myopathies

    Excludes1: arthrogryposis multiplex congenita (Q74.3)
       dermatopolymyositis (M33.-)
       ischemic infarction of muscle (M62.2-)
       myositis (M60.-)
       polymyositis (M33.2.-)
    G72.0 Drug-induced myopathy
       Code first (T36-T50) to identify drug
    G72.1 Alcoholic myopathy
       Use additional code to identify alcoholism (F10.-)
    G72.2 Myopathy due to other toxic agents
       Code first (T51-T65) to identify toxic agent.
    G72.3 Periodic paralysis
       Familial periodic paralysis
       Hyperkalemic periodic paralysis (familial)
       Hypokalemic periodic paralysis (familial)
       Myotonic periodic paralysis (familial)
       Normokalemic paralysis (familial)
       Potassium sensitive periodic paralysis
       Excludes1: paramyotonia congenita (of von Eulenburg) (G71.19)
    G72.4 Inflammatory and immune myopathies, not elsewhere classified
       G72.41 Inclusion body myositis [IBM]
       G72.49 Other inflammatory and immune myopathies, not elsewhere classified
          Inflammatory myopathy NOS
    G72.8 Other specified myopathies
       G72.81 Critical illness myopathy
          Acute necrotizing myopathy
          Acute quadriplegic myopathy
          Intensive care (ICU) myopathy
          Myopathy of critical illness
       G72.89 Other specified myopathies
    G72.9 Myopathy, unspecified

## G73 Disorders of myoneural junction and muscle in diseases classified elsewhereG73 Disorders of myoneural junction and muscle in diseases classified elsewhere

    G73. ​1 Lambert-Eaton syndrome
       Code first underlying disease, such as:
          malignant neoplasm of lung (C34.-)
          other neoplastic disease (C00-D48)
       Excludes1: Lambert-Eaton syndrome not associated with neoplasm (G70.8)
    G73.3 Myasthenic syndromes in other diseases classified elsewhere
       Code first underlying disease, such as:
          neoplasm (C00-D498)
          thyrotoxicosis (E05.-)
    G73.7 Myopathy in diseases classified elsewhere
       Code first underlying disease, such as:
          hyperparathyroidism (E21.0, E21.3)
          hypoparathyroidism (E20.-)
          glycogen storage disease (E74.0)
          lipid storage disorders (E75.-)
          Excludes1: myopathy in:
          rheumatoid arthritis (M05.32)
          sarcoidosis (D86.87)
          scleroderma (M34.82)
          sicca syndrome [Sj?gren] (M35.03)
          systemic lupus erythematosus (M32.19)

# Cerebral palsy and other paralytic syndromes (G80-G83)Cerebral palsy and other paralytic syndromes (G80-G83)
## G80 Cerebral palsyG80 Cerebral palsy

    Excludes1: hereditary spastic paraplegia (G11.4)
    G80.0 Spastic quadriplegic cerebral palsy
       Congenital spastic paralysis (cerebral)
    G80.1 Spastic diplegic cerebral palsy
       Spastic cerebral palsy NOS
    G80.2 Spastic hemiplegic cerebral palsy
    G80.3 Athetoid cerebral palsy
       Double athetosis (syndrome)
       Dyskinetic cerebral palsy
       Dystonic cerebral palsy
       Vogt disease
    G80.4 Ataxic cerebral palsy
    G80.8 Other cerebral palsy
       Mixed cerebral palsy syndromes
    G80.9 Cerebral palsy, unspecified
       Cerebral palsy NOS

## G81 Hemiplegia and hemiparesisG81 Hemiplegia and hemiparesis

    Note: This category is to be used only when hemiplegia (complete)(incomplete) is reported without further specification, or is stated to be old or
       longstanding ​but of unspecified cause. The category is also for use in multiple coding to identify these types of hemiplegia resulting from any cause.
    Excludes1: congenital cerebral palsy (G80.-)
       hemiplegia and hemiparesis due to sequela of cerebrovascular disease (I69.05-, I69.15-, I69.25-, I69.35-, I69.45-, I69.85-, I69.95-)
    G81.0 Flaccid hemiplegia
       G81.00 Flaccid hemiplegia affecting unspecified side
       G81.01 Flaccid hemiplegia affecting right dominant side
       G81.02 Flaccid hemiplegia affecting left dominant side
       G81.03 Flaccid hemiplegia affecting right nondominant side
       G81.04 Flaccid hemiplegia affecting left nondominant side
    G81.1 Spastic hemiplegia
       G81.10 Spastic hemiplegia affecting unspecified side
       G81.11 Spastic hemiplegia affecting right dominant side
       G81.12 Spastic hemiplegia affecting left dominant side
       G81.13 Spastic hemiplegia affecting right nondominant side
       G81.14 Spastic hemiplegia affecting left nondominant side
    G81.9 Hemiplegia, unspecified
       G81.90 Hemiplegia, unspecified affecting unspecified side
       G81.91 Hemiplegia, unspecified affecting right dominant side
       G81.92 Hemiplegia, unspecified affecting left dominant side
       G81.93 Hemiplegia, unspecified affecting right nondominant side
       G81.94 Hemiplegia, unspecified affecting left nondominant side

## G82 Paraplegia (paraparesis) and quadriplegia (quadriparesis)G82 Paraplegia (paraparesis) and quadriplegia (quadriparesis)

    Note: This category is to be used only when the listed conditions are reported without further specification, or are stated to be old or longstanding but of unspecified cause. The category is also for use in multiple coding to identify these conditions resulting from any cause
    Excludes1: congenital cerebral palsy (G80.-)
       functional quadriplegia (R53.2)
       hysterical paralysis (F44.4)
    G82.2 Paraplegia
       Paralysis of both lower limbs NOS
       Paraparesis (lower) NOS
       Paraplegia (lower) NOS
       G82.20 Paraplegia, unspecified
       G82.21 Paraplegia, complete
       G82.22 Paraplegia, incomplete
    G82.5 Quadriplegia
       G82.50 Quadriplegia, unspecified
       G82.51 Quadriplegia, C1-C4 complete
       G82.52 Quadriplegia, C1-C4 incomplete
       G82.53 Quadriplegia, C5-C7 complete
       G82. ​54 Quadriplegia, C5-C7 incomplete

## G83 Other paralytic syndromesG83 Other paralytic syndromes

    Note: This category is to be used only when the listed conditions are reported without further specification, or are stated to be old or longstanding but of unspecified cause. The category is also for use in multiple coding to identify these conditions resulting from any cause.
    Includes paralysis (complete) (incomplete), except as in G80-G82
    G83.0 Diplegia of upper limbs
       Diplegia (upper)
       Paralysis of both upper limbs
    G83.1 Monoplegia of lower limb
       Paralysis of lower limb
       Excludes1: monoplegia of lower limbs due to sequela of cerebrovascular disease (I69.04-, I69.14-, I69.24-, I69.34-, I69.44-, I69.84-, I69.94-)
       G83.10 Monoplegia of lower limb affecting unspecified side
       G83.11 Monoplegia of lower limb affecting right dominant side
       G83.12 Monoplegia of lower limb affecting left dominant side
       G83.13 Monoplegia of lower limb affecting right nondominant side
       G83.14 Monoplegia of lower limb affecting left nondominant side
    G83.2 Monoplegia of upper limb
       Paralysis of upper limb
       Excludes1: monoplegia of upper limbs due to sequela of cerebrovascular disease (I69.03-, I69.13-, I69.23-, I69.33-, I69.43-, I69.83-, I69.93-)
       G83.20 Monoplegia of upper limb affecting unspecified side
       G83.21 Monoplegia of upper limb affecting right dominant side
       G83.22 Monoplegia of upper limb affecting left dominant side
       G83.23 Monoplegia of upper limb affecting right nondominant side
       G83.24 Monoplegia of upper limb affecting left nondominant side
    G83.3 Monoplegia, unspecified
       G83.30 Monoplegia, unspecified affecting unspecified side
       G83.31 Monoplegia, unspecified affecting right dominant side
       G83.32 Monoplegia, unspecified affecting left dominant side
       G83.33 Monoplegia, unspecified affecting right nondominant side
       G83.34 Monoplegia, unspecified affecting left nondominant side
    G83.4 Cauda equina syndrome
       Neurogenic bladder due to cauda equina syndrome
       Excludes1: cord bladder NOS (G95.8)
          neurogenic bladder NOS (N31.9)
    G83. ​5 Locked-in state
    G83.8 Other specified paralytic syndromes
       Excludes1: paralytic syndromes due to current spinal cord injury-code to spinal cord injury (S14, S24, S34)
       G83.81 Brown-Sequard syndrome
       G83.82 Anterior cord syndrome
       G83.83 Posterior cord syndrome
       G83.84 Todd's paralysis (postepileptic)
       G83.89 Other specified paralytic syndromes
    G83.9 Paralytic syndrome, unspecified

# Other disorders of the nervous system (G89-G99)Other disorders of the nervous system (G89-G99)
## G89 Pain, not elsewhere classifiedG89 Pain, not elsewhere classified

    Code also related psychological factors associated with pain (F45.42)
    Excludes1: generalized pain NOS (R52)
       pain disorders exclusively related to psychological factors (F45.41)
       pain NOS (R52)
    Excludes2: atypical face pain (G50.1)
       headache syndromes (G44.-)
       localized pain, unspecified type - code to pain by site, such as:
          abdomen pain (R10.-)
          back pain (M54.9)
          breast pain (N64.4)
          chest pain (R07.1-R07.9)
          ear pain (H92.0-)
          eye pain (H57.1)
          headache (R51)
          joint pain (M25.5-)
          limb pain (M79.6-)
          lumbar region pain (M54.57)
          painful urination (R30.9)
          pelvic and perineal pain (R10.2)
          shoulder pain (M25.51-)
          spine pain (M54.-)
          throat pain (R07.0)
          tongue pain (K14.6)
          tooth pain (K08.8)
          renal colic (N23)
       migraines (G43.-)
       myalgia (M79.1)
       pain ​from prosthetic devices, implants, and grafts (T82.84, T83.84, T84.84, T85.84)
       phantom limb syndrome with pain (G54.6)
       vulvar vestibulitis (N94.810)
       vulvodynia (N94.81-)
    G89.0 Central pain syndrome
       Déjérine-Roussy syndrome
       Myelopathic pain syndrome
       Thalamic pain syndrome (hyperesthetic)
    G89.1 Acute pain, not elsewhere classified
       G89.11 Acute pain due to trauma
       G89.12 Acute post-thoracotomy pain
          Post-thoracotomy pain NOS
       G89.18 Other acute postprocedural pain
          Postoperative pain NOS
          Postprocedural pain NOS
    G89.2 Chronic pain, not elsewhere classified
       Excludes1: causalgia, lower limb (G57.7-)
          causalgia, upper limb (G56.4-)
          central pain syndrome (G89.0)
          chronic pain syndrome (G89.4)
          complex regional pain syndrome II, lower limb (G57.7-)
          complex regional pain syndrome II, upper limb (G56.4-)
          neoplasm related chronic pain (G89.3)
          reflex sympathetic dystrophy (G90.5-)
       G89.21 Chronic pain due to trauma
       G89.22 Chronic post-thoracotomy pain
       G89.28 Other chronic postprocedural pain
          Other chronic postoperative pain
    G89.3 Neoplasm related pain (acute) (chronic)
       Cancer associated pain
       Pain due to malignancy (primary) (secondary)
       Tumor associated pain
    G89.4 Chronic pain syndrome
       Chronic pain associated with significant psychosocial dysfunction

## G90 Disorders of autonomic nervous systemG90 Disorders of autonomic nervous system

    Excludes1: dysfunction of the autonomic nervous system due to alcohol (G31.2)
    G90.0 Idiopathic peripheral autonomic neuropathy
       G90.01 Carotid sinus syncope
          Carotid sinus syndrome
       G90.09 Other idiopathic peripheral autonomic neuropathy
          Idiopathic peripheral autonomic neuropathy NOS
    G90.1 Familial dysautonomia [Riley-Day]
    G90.2 Horner's syndrome
       Bernard(-Horner) syndrome
       Cervical ​sympathetic dystrophy or paralysis
    G90.3 Multi-system degeneration of the autonomic nervous system
       Neurogenic orthostatic hypotension [Shy-Drager]
       Excludes1: orthostatic hypotension NOS (I95.1)
    G90.4 Autonomic dysreflexia
       Use additional code to identify the cause, such as:
          pressure ulcer (pressure area) (L89.-)
          fecal impaction (K56.4)
          urinary tract infection (N39.0)
    G90.5 Complex regional pain syndrome I (CRPS I)
       Reflex sympathetic dystrophy
       Excludes1: causalgia of lower limb (G57.7-)
          causalgia of upper limb (G56.4-)
          complex regional pain syndrome II of lower limb (G57.7-)
          complex regional pain syndrome II of upper limb (G56.4-)
       G90.50 Complex regional pain syndrome I, unspecified
       G90.51 Complex regional pain syndrome I of upper limb
          G90.511 Complex regional pain syndrome I of right upper limb
          G90.512 Complex regional pain syndrome I of left upper limb
          G90.513 Complex regional pain syndrome I of upper limb, bilateral
          G90.519 Complex regional pain syndrome I of unspecified upper limb
       G90.52 Complex regional pain syndrome I of lower limb
          G90.521 Complex regional pain syndrome I of right lower limb
          G90.522 Complex regional pain syndrome I of left lower limb
          G90.523 Complex regional pain syndrome I of lower limb, bilateral
          G90.529 Complex regional pain syndrome I of unspecified lower limb
       G90.59 Complex regional pain syndrome I of other specified site
    G90.8 Other disorders of autonomic nervous system
    G90.9 Disorder of the autonomic nervous system, unspecified

## G91 HydrocephalusG91 Hydrocephalus

    Includes acquired hydrocephalus
    Excludes1: Arnold-Chiari syndrome with hydrocephalus (Q07.-)
       congenital hydrocephalus (Q03.-)
       spina bifida with hydrocephalus (Q05.-)
    G91.0 Communicating hydrocephalus
       Secondary ​normal pressure hydrocephalus
    G91.1 Obstructive hydrocephalus
    G91.2 (Idiopathic) normal pressure hydrocephalus
       Normal pressure hydrocephalus NOS
    G91.3 Post-traumatic hydrocephalus, unspecified
    G91.4 Hydrocephalus in diseases classified elsewhere
       Code first underlying condition, such as:
          congenital syphilis (A50.4-)
          neoplasm (C00-D48)
       Excludes1: hydrocephalus due to congenital toxoplasmosis (P37.1)
    G91.8 Other hydrocephalus
    G91.9 Hydrocephalus, unspecified

## G92 Toxic encephalopathyG92 Toxic encephalopathy

    Toxic encephalitis
    Toxic metabolic encephalopathy
    Code first (T51-T65) to identify toxic agent.

## G93 Other disorders of brainG93 Other disorders of brain

    G93.0 Cerebral cysts
       Arachnoid cyst
       Porencephalic cyst, acquired
       Excludes1: acquired periventricular cysts of newborn (P91.1)
       congenital cerebral cysts (Q04.6)
    G93.1 Anoxic brain damage, not elsewhere classified
       Excludes1: cerebral anoxia due to anesthesia during labor and delivery (O74.3)
          cerebral anoxia due to anesthesia during the puerperium (O89.2)
          neonatal anoxia (P28.9)
    G93.2 Benign intracranial hypertension
       Excludes1: hypertensive encephalopathy (I67.4)
    G93.3 Postviral fatigue syndrome
       Benign myalgic encephalomyelitis
       Excludes1: chronic fatigue syndrome NOS (R53.82)
    G93.4 Other and unspecified encephalopathy
       Excludes1: alcoholic encephalopathy (G31.2)
          hypertensive encephalopathy (I67.4)
          toxic (metabolic) encephalopathy (G92)
       G93.40 Encephalopathy, unspecified
       G93.41 Metabolic encephalopathy
          Septic encephalopathy
       G93.49 Other encephalopathy
          Encephalopathy NEC
    G93.5 Compression of brain
       Arnold-Chiari type 1 compression of brain
       Compression of brain (stem)
       Herniation ​of brain (stem)
       Excludes1: diffuse traumatic compression of brain (S06.2-)
          focal traumatic compression of brain (S06.3-)
    G93.6 Cerebral edema
       Excludes1: cerebral edema due to birth injury (P11.0)
          traumatic cerebral edema (S06.1-)
    G93.7 Reye's syndrome
       Code first (T39.0-), if salicylates-induced
    G93.8 Other specified disorders of brain
       G93.81 Temporal sclerosis
          Hippocampal sclerosis
          Mesial temporal sclerosis
       G93.89 Other specified disorders of brain
          Postradiation encephalopathy
    G93.9 Disorder of brain, unspecified

## G94 Other disorders of brain in diseases classified elsewhereG94 Other disorders of brain in diseases classified elsewhere

    Code first underlying disease
    Excludes1: encephalopathy in congenital syphilis (A50.49)
       encephalopathy in influenza (J10.89)
       encephalopathy in syphilis (A52.19)
       hydrocephalus in diseases classified elsewhere (G91.4)

## G95 Other and unspecified diseases of spinal cordG95 Other and unspecified diseases of spinal cord

    Excludes2: myelitis (G04.-)
    G95.0 Syringomyelia and syringobulbia
    G95.1 Vascular myelopathies
       Excludes2: intraspinal phlebitis and thrombophlebitis, except non-pyogenic (G08)
       G95.11 Acute infarction of spinal cord (embolic) (nonembolic)
          Anoxia of spinal cord
          Arterial thrombosis of spinal cord
       G95.19 Other vascular myelopathies
          Edema of spinal cord
          Hematomyelia
          Nonpyogenic intraspinal phlebitis and thrombophlebitis
          Subacute necrotic myelopathy
    G95.2 Other and unspecified cord compression
       G95.20 Unspecified cord compression
       G95.29 Other cord compression
    G95.8 Other specified diseases of spinal cord
       Excludes1: neurogenic bladder NOS (N31.9)
          neurogenic bladder due to cauda equina syndrome (G83.4)
          neuromuscular dysfunction of bladder without spinal cord lesion (N31.-)
       G95.81 Conus medullaris syndrome
       G95.89 Other specified diseases of spinal cord
          Cord ​bladder NOS
          Drug-induced myelopathy
          Radiation-induced myelopathy
          Excludes1: myelopathy NOS (G95.9)
    G95.9 Disease of spinal cord, unspecified
       Myelopathy NOS

## G96 Other disorders of central nervous systemG96 Other disorders of central nervous system

    G96.0 Cerebrospinal fluid leak
       Excludes1: cerebrospinal fluid leak from spinal puncture (G97.0)
    G96.1 Disorders of meninges, not elsewhere classified
       G96.11 Dural tear
          Excludes1: accidental puncture or laceration of dura during a procedure (G97.41)
       G96.12 Meningeal adhesions (cerebral) (spinal)
       G96.19 Other disorders of meninges, not elsewhere classified
    G96.8 Other specified disorders of central nervous system
    G96.9 Disorder of central nervous system, unspecified

## G97 Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classifiedG97 Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified

    Excludes2: intraoperative and postprocedural cerebrovascular infarction (I97.81-, I97.82- )
    G97.0 Cerebrospinal fluid leak from spinal puncture
    G97.1 Other reaction to spinal and lumbar puncture
       Headache due to lumbar puncture
    G97.2 Intracranial hypotension following ventricular shunting
    G97.3 Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a procedure
       Excludes1: intraoperative hemorrhage and hematoma of a nervous system organ or structure due to accidental puncture and laceration during a procedure (G97.4-)
       G97.31 Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a nervous system procedure
       G97.32 Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating other procedure
    G97.4 Accidental puncture and laceration of a nervous system organ or structure during a procedure
       G97.41 Accidental puncture or laceration of dura during a procedure
          Incidental (inadvertent) durotomy
       G97.48 Accidental puncture and laceration of other nervous system organ or structure during a nervous system procedure
       G97. ​49 Accidental puncture and laceration of other nervous system organ or structure during other procedure
    G97.5 Postprocedural hemorrhage and hematoma of a nervous system organ or structure following a procedure
       G97.51 Postprocedural hemorrhage and hematoma of a nervous system organ or structure following a nervous system procedure
       G97.52 Postprocedural hemorrhage and hematoma of a nervous system organ or structure following other procedure
    G97.8 Other intraoperative and postprocedural complications and disorders of nervous system
       Use additional code to further specify disorder
       G97.81 Other intraoperative complications of nervous system
       G97.82 Other postprocedural complications and disorders of nervous system

## G98 Other disorders of nervous system not elsewhere classifiedG98 Other disorders of nervous system not elsewhere classified

    Includes nervous system disorder NOS
    G98.0 Neurogenic arthritis, not elsewhere classified
       Nonsyphilitic neurogenic arthropathy NEC
       Nonsyphilitic neurogenic spondylopathy NEC
       Excludes1: spondylopathy (in):
          syringomyelia and syringobulbia (G95.0)
          tabes dorsalis (A52.11)
    G98.8 Other disorders of nervous system
       Nervous system disorder NOS

## G99 Other disorders of nervous system in diseases classified elsewhereG99 Other disorders of nervous system in diseases classified elsewhere

    G99.0 Autonomic neuropathy in diseases classified elsewhere
       Code first underlying disease, such as:
          amyloidosis (E85.-)
          gout ( M1a-, M10.-)
          hyperthyroidism (E05.-)
       Excludes1: diabetic autonomic neuropathy (E09-14 with .43)
    G99.2 Myelopathy in diseases classified elsewhere
       Code first underlying disease, such as:
          neoplasm (C00-D48)
       Excludes1: myelopathy in:
          intervertebral disease (M50.0-, M51.0-)
          spondylosis (M47.0-, M47.1-)
    G99.8 Other specified disorders of nervous system in diseases classified elsewhere
       Code first underlying disorder, such as: ​
          amyloidosis (E85.-)
          avitaminosis (E56.9)
       Excludes1: nervous system involvement in:
          cysticercosis (B69.0)
          rubella (B06.0-)
          syphilis (A52.1-)