# Library of Congress Classification/Class R

CLASS R - MEDICINE
(Click each subclass for details)
| Subclass R | Medicine (General) |
| Subclass RA | Public aspects of medicine |
| Subclass RB | Pathology |
| Subclass RC | Internal medicine |
| Subclass RD | Surgery |
| Subclass RE | Ophthalmology |
| Subclass RF | Otorhinolaryngology |
| Subclass RG | Gynecology and obstetrics |
| Subclass RJ | Pediatrics |
| Subclass RK | Dentistry |
| Subclass RL | Dermatology |
| Subclass RM | Therapeutics. Pharmacology |
| Subclass RS | Pharmacy and materia medica |
| Subclass RT | Nursing |
| Subclass RV | Botanic, Thomsonian, and eclectic medicine |
| Subclass RX | Homeopathy |
| Subclass RZ | Other systems of medicine |
​Subclass R
| R5-920 | Medicine (General) |
| R5-130.5 | General works |
| R131-687 | History of medicine. Medical expeditions |
| R690-697 | Medicine as a profession. Physicians |
| R702-703 | Medicine and the humanities. Medicine and disease in relation to history, literature, etc. |
| R711-713.97 | Directories |
| R722-722.32 | Missionary medicine. Medical missionaries |
| R723-726 | Medical philosophy. Medical ethics |
| R726.5-726.8 | Medicine and disease in relation to psychology. Terminal care. Dying |
| R727-727.5 | Medical personnel and the public. Physician and the public |
| R728-733 | Practice of medicine. Medical practice economics |
| R735-854 | Medical education. Medical schools. Research |
| R855-855.5 | Medical technology |
| R856-857 | Biomedical engineering. Electronics. Instrumentation |
| R858-859.7 | Computer applications to medicine. Medical informatics |
| R864 | Medical records |
| R895-920 | Medical physics. Medical radiology. Nuclear medicine |
| RA1-1270 | Public aspects of medicine | Public aspects of medicine |
| RA1-418.5 | Medicine and the state | Medicine and the state |
| RA396 | | Regulation of medical education. Licensure |
| RA398 | | Registration of physicians, pharmacists, etc. |
| RA399 | | Regulation of medical practice. Evaluation and quality control of medical care. Medical audit |
| RA405 | | Death certification |
| RA407-409.5 | | Health status indicators. Medical statistics and surveys |
| RA410-410.9 | | Medical economics. Economics of medical care. Employment |
| RA411-415 | | Provisions for personal medical care. Medical care plans |
| RA418-418.5 | | Medicine and society. Social medicine. Medical sociology |
| RA421-790.95 | Public health. Hygiene. Preventive medicine | Public health. Hygiene. Preventive medicine |
| RA428-428.5 | | Public health laboratories, institutes, etc. |
| RA440-440.87 | | Study and teaching. Research |
| RA565-600 | | Environmental health Including sewage disposal, air pollution, nuisances, water supply |
| RA601-602 | | Food and food supply in relation to public health |
| RA604-618 | | Parks, public baths, public carriers, buildings, etc. |
| RA619-637 | | Disposal of the dead. Undertaking. Burial. Cremation. Cemeteries |
| RA638 | | Immunity and immunization in relation to public health |
| RA639-642 | | Transmission of disease |
| RA643-645 | | Disease (Communicable and noninfectious) and public health |
| RA645.3-645.37 | | Home health care services |
| RA645.5-645.9 | | Emergency medical services |
| RA646-648.3 | | War and public health |
| RA648.5-767 | | Epidemics. Epidemiology. Quarantine. Disinfection |
| RA771-771.7 | | Rural health and hygiene. Rural health services |
| RA773-788 | | Personal health and hygiene Including clothing, bathing, exercise, travel, nutrition, sleep, sex hygiene |
| RA790-790.95 | | Mental health. Mental illness prevention |
| RA791-954 | Medical geography. Climatology. Meteorology | Medical geography. Climatology. Meteorology |
| RA960-1000.5 | Medical centers. Hospitals. Dispensaries. Clinics Including ambulance service, nursing homes, hospices | Medical centers. Hospitals. Dispensaries. Clinics Including ambulance service, nursing homes, hospices |
| RA1001-1171 | Forensic medicine. Medical jurisprudence. Legal medicine | Forensic medicine. Medical jurisprudence. Legal medicine |
| RA1190-1270 | Toxicology. Poisons | Toxicology. Poisons |
| RB1-214 | Pathology |
| RB1-17 | General works |
| RB24-33 | Pathological anatomy and histology |
| RB37-56.5 | Clinical pathology. Laboratory technique |
| RB57 | Post-mortem examination. Autopsies |
| RB127-150 | Manifestations of disease |
| RB151-214 | Theories of disease. Etiology. Pathogenesis |
| RC31-1245 | Internal medicine | Internal medicine | Internal medicine | Internal medicine | Internal medicine |
| RC49-52 | Psychosomatic medicine | Psychosomatic medicine | Psychosomatic medicine | Psychosomatic medicine | Psychosomatic medicine |
| RC71-78.7 | Examination. Diagnosis Including raiography | Examination. Diagnosis Including raiography | Examination. Diagnosis Including raiography | Examination. Diagnosis Including raiography | Examination. Diagnosis Including raiography |
| RC81-82 | Popular medicine | Popular medicine | Popular medicine | Popular medicine | Popular medicine |
| RC86-88.9 | Medical emergencies. Critical care. Intensive care. First aid | Medical emergencies. Critical care. Intensive care. First aid | Medical emergencies. Critical care. Intensive care. First aid | Medical emergencies. Critical care. Intensive care. First aid | Medical emergencies. Critical care. Intensive care. First aid |
| RC91-103 | Disease due to physical and chemical agents | Disease due to physical and chemical agents | Disease due to physical and chemical agents | Disease due to physical and chemical agents | Disease due to physical and chemical agents |
| RC109-216 | Infectious and parasitic diseases | Infectious and parasitic diseases | Infectious and parasitic diseases | Infectious and parasitic diseases | Infectious and parasitic diseases |
| RC251 | Constitutional diseases (General) | Constitutional diseases (General) | Constitutional diseases (General) | Constitutional diseases (General) | Constitutional diseases (General) |
| RC254-282 | Neoplasms. Tumors. Oncology Including cancer and carcinogens | Neoplasms. Tumors. Oncology Including cancer and carcinogens | Neoplasms. Tumors. Oncology Including cancer and carcinogens | Neoplasms. Tumors. Oncology Including cancer and carcinogens | Neoplasms. Tumors. Oncology Including cancer and carcinogens |
| RC306-320.5 | Tuberculosis | Tuberculosis | Tuberculosis | Tuberculosis | Tuberculosis |
| RC321-571 | Neurosciences. Biological psychiatry. Neuropsychiatry | Neurosciences. Biological psychiatry. Neuropsychiatry | Neurosciences. Biological psychiatry. Neuropsychiatry | Neurosciences. Biological psychiatry. Neuropsychiatry | Neurosciences. Biological psychiatry. Neuropsychiatry |
| RC346-429 | | Neurology. Diseases of the nervous system Including speech disorders | Neurology. Diseases of the nervous system Including speech disorders | Neurology. Diseases of the nervous system Including speech disorders | Neurology. Diseases of the nervous system Including speech disorders |
| RC435-571 | | | Psychiatry | Psychiatry | Psychiatry |
| RC475-489 | | | | Therapeutics. Psychotherapy | Therapeutics. Psychotherapy |
| RC490-499 | | | | Hypnotism and hypnosis. Suggestion therapy | Hypnotism and hypnosis. Suggestion therapy |
| RC500-510 | | | | Psychoanalysis | Psychoanalysis |
| RC512-569.5 | | | | Psychopathology | Psychopathology |
| RC512-528 | | | | | Psychoses |
| RC530-552 | | | | | Neuroses |
| RC554-569.5 | | | | | Personality disorders. Behavior problems Including sexual problems, drug abuse, suicide, child abuse |
| RC569.7-571 | | | | Mental retardation. Developmental disabilities | Mental retardation. Developmental disabilities |
| RC581-951 | Specialties of internal medicine | Specialties of internal medicine | Specialties of internal medicine | Specialties of internal medicine | Specialties of internal medicine |
| RC581-607 | | Immunologic diseases. Allergy | Immunologic diseases. Allergy | Immunologic diseases. Allergy | Immunologic diseases. Allergy |
| RC620-627 | | Nutritional diseases. Deficiency diseases | Nutritional diseases. Deficiency diseases | Nutritional diseases. Deficiency diseases | Nutritional diseases. Deficiency diseases |
| RC627.5-632 | | Metabolic diseases | Metabolic diseases | Metabolic diseases | Metabolic diseases |
| RC633-647.5 | | Diseases of the blood and blood-forming organs | Diseases of the blood and blood-forming organs | Diseases of the blood and blood-forming organs | Diseases of the blood and blood-forming organs |
| RC648-665 | | Diseases of the endocrine glands. Clinical endocrinology | Diseases of the endocrine glands. Clinical endocrinology | Diseases of the endocrine glands. Clinical endocrinology | Diseases of the endocrine glands. Clinical endocrinology |
| RC666-701 | | Diseases of the circulatory (Cardiovascular) system | Diseases of the circulatory (Cardiovascular) system | Diseases of the circulatory (Cardiovascular) system | Diseases of the circulatory (Cardiovascular) system |
| RC705-779 | | Diseases of the respiratory system | Diseases of the respiratory system | Diseases of the respiratory system | Diseases of the respiratory system |
| RC799-869 | | Diseases of the digestive system. Gastroenterology | Diseases of the digestive system. Gastroenterology | Diseases of the digestive system. Gastroenterology | Diseases of the digestive system. Gastroenterology |
| RC870-923 | | Diseases of the genitourinary system. Urology | Diseases of the genitourinary system. Urology | Diseases of the genitourinary system. Urology | Diseases of the genitourinary system. Urology |
| RC924-924.5 | | Diseases of the connective tissues | Diseases of the connective tissues | Diseases of the connective tissues | Diseases of the connective tissues |
| RC925-935 | | Diseases of the musculoskeletal system | Diseases of the musculoskeletal system | Diseases of the musculoskeletal system | Diseases of the musculoskeletal system |
| RC952-1245 | Special situations and conditions | Special situations and conditions | Special situations and conditions | Special situations and conditions | Special situations and conditions |
| RC952-954.6 | | Geriatrics | Geriatrics | Geriatrics | Geriatrics |
| RC955-962 | | Arctic medicine. Tropical medicine | Arctic medicine. Tropical medicine | Arctic medicine. Tropical medicine | Arctic medicine. Tropical medicine |
| RC963-969 | | Industrial medicine. Industrial hygiene | Industrial medicine. Industrial hygiene | Industrial medicine. Industrial hygiene | Industrial medicine. Industrial hygiene |
| RC970-986 | | Military medicine. Naval medicine | Military medicine. Naval medicine | Military medicine. Naval medicine | Military medicine. Naval medicine |
| RC1000-1020 | | Submarine medicine | Submarine medicine | Submarine medicine | Submarine medicine |
| RC1030-1160 | | Transportation medicine Including automotive, aviation, and space medicine | Transportation medicine Including automotive, aviation, and space medicine | Transportation medicine Including automotive, aviation, and space medicine | Transportation medicine Including automotive, aviation, and space medicine |
| RC1200-1245 | | Sports medicine | Sports medicine | Sports medicine | Sports medicine |
| RD1-811 | Surgery | Surgery |
| RD1-31.7 | General works | General works |
| RD32-33.9 | Operative surgery. Technique of surgical operations | Operative surgery. Technique of surgical operations |
| RD49-52 | Surgical therapeutics. Preoperative and postoperative care | Surgical therapeutics. Preoperative and postoperative care |
| RD57 | Surgical pathology | Surgical pathology |
| RD58 | Reparative processes after operations (Physiological) | Reparative processes after operations (Physiological) |
| RD59 | Surgical shock. Traumatic shock | Surgical shock. Traumatic shock |
| RD63-76 | Operating rooms and theaters. Instruments, apparatus, and appliances | Operating rooms and theaters. Instruments, apparatus, and appliances |
| RD78.3-87.3 | Anesthesiology | Anesthesiology |
| RD91-91.5 | Asepsis and antisepsis. Sterilization (Operative) | Asepsis and antisepsis. Sterilization (Operative) |
| RD92-97.8 | Emergency surgery. Wounds and injuries | Emergency surgery. Wounds and injuries |
| RD98-98.4 | Surgical complications | Surgical complications |
| RD99-99.35 | Surgical nursing | Surgical nursing |
| RD101-104 | Fractures (General) | Fractures (General) |
| RD118-120.5 | Plastic surgery. Reparative surgery | Plastic surgery. Reparative surgery |
| RD120.6-129.8 | Transplantation of organs, tissues, etc. | Transplantation of organs, tissues, etc. |
| RD130 | Prosthesis. Artificial organs | Prosthesis. Artificial organs |
| RD137-145 | Surgery in childhood, adolescence, pregnancy, old age | Surgery in childhood, adolescence, pregnancy, old age |
| RD151-498 | Military and naval surgery | Military and naval surgery |
| RD520-599.5 | Surgery by region, system, or organ | Surgery by region, system, or organ |
| RD651-678 | Neoplasms. Tumors. Oncology | Neoplasms. Tumors. Oncology |
| RD680-688 | Diseases of the locomotor system (Surgical treatment) | Diseases of the locomotor system (Surgical treatment) |
| RD701-811 | Orthopedic surgery | Orthopedic surgery |
| RD792-811 | | Physical rehabilitation |
| RE1-994 | Ophthalmology |
| RE75-79 | Examination. Diagnosis |
| RE80-87 | Eye surgery |
| RE88 | Ophthalmic nursing |
| RE89 | Eye banks |
| RE91-912 | Particular diseases of the eye |
| RE918-921 | Color vision tests, charts, etc. |
| RE925-939 | Refraction and errors of refraction and accommodation |
| RE939.2-981 | Optometry. Opticians. Eyeglasses |
| RE986-988 | Artificial eyes and other prostheses |
| RE991-992 | Ocular therapeutics |
| RF1-547 | Otorhinolaryngology |
| RF110-320 | Otology. Diseases of the ear |
| RF341-437 | Rhinology. Diseases of the nose, accessory sinuses, and nasopharynx |
| RF460-547 | Laryngology. Diseases of the throat |
| RG1-991 | Gynecology and obstetrics | Gynecology and obstetrics | Gynecology and obstetrics |
| RG104-104.7 | Operative gynecology | Operative gynecology | Operative gynecology |
| RG133-137.6 | Conception. Artificial insemination. Contraception | Conception. Artificial insemination. Contraception | Conception. Artificial insemination. Contraception |
| RG138 | Sterilization of women | Sterilization of women | Sterilization of women |
| RG159-208 | Functional and systemic disorders. Endocrine gynecology | Functional and systemic disorders. Endocrine gynecology | Functional and systemic disorders. Endocrine gynecology |
| RG211-483 | Abnormalities and diseases of the female genital organs | Abnormalities and diseases of the female genital organs | Abnormalities and diseases of the female genital organs |
| RG484-485 | Urogynecology and obstetric urology. Urogynecologic surgery | Urogynecology and obstetric urology. Urogynecologic surgery | Urogynecology and obstetric urology. Urogynecologic surgery |
| RG491-499 | Diseases of the breast | Diseases of the breast | Diseases of the breast |
| RG500-991 | Obstetrics | Obstetrics | Obstetrics |
| RG551-591 | | Pregnancy | Pregnancy |
| RG600-650 | | The embryo and fetus | The embryo and fetus |
| RG648 | | | Spontaneous abortion. Miscarriage |
| RG651-721 | | Labor. Parturition | Labor. Parturition |
| RG725-791 | | Obstetric operations. Operative obstetrics | Obstetric operations. Operative obstetrics |
| RG801-871 | | Puerperal state | Puerperal state |
| RG940-991 | | Maternal care. Prenatal care services | Maternal care. Prenatal care services |
| RJ1-570 | Pediatrics |
| RJ47.3-47.4 | Genetic aspects |
| RJ50-51 | Examination. Diagnosis |
| RJ52-53 | Therapeutics |
| RJ59-60 | Infant and neonatal morbidity and mortality |
| RJ91 | Supposed prenatal influence. Prenatal culture. Stirpiculture |
| RJ101-103 | Child health. Child health services |
| RJ125-145 | Physiology of children and adolescents |
| RJ206-235 | Nutrition and feeding of children and adolescents |
| RJ240 | Immunization of children (General) |
| RJ242-243 | Hospital care |
| RJ245-247 | Nursing of children. Pediatric nursing |
| RJ250-250.3 | Premature infants |
| RJ251-325 | Newborn infants Including physiology, care, treatment, diseases |
| RJ370-550 | Diseases of children and adolescents |
| RJ499-507 | | Mental disorders. Child psychiatry |
| RK1-715 | Dentistry |
| RK58-59.3 | Practice of dentistry. Dental economics |
| RK60.7-60.8 | Preventive dentistry |
| RK280 | Oral and dental anatomy and physiology |
| RK301-493 | Oral and dental medicine. Pathology. Diseases |
| RK501-519 | Operative dentistry. Restorative dentistry |
| RK520-528 | Orthodontics |
| RK529-535 | Oral surgery |
| RK641-667 | Prosthetic dentistry. Prosthodontics |
| RL1-803 | Dermatology |
| RL87-94 | Care and hygiene |
| RL95 | Pathological anatomy |
| RL110-120 | Therapeutics |
| RL130-169 | Diseases of the glands, hair, nails |
| RL201-331 | Hyperemias, inflammations, and infections of the skin |
| RL391-489 | Atrophies. Hypertrophies |
| RL675 | Chronic ulcer of the skin. Bedsores |
| RL701-751 | Diseases due to psychosomatic and nerve disorders. Dermatoneuroses |
| RL760-785 | Diseases due to parasites |
| RL790 | Pigmentations. Albinism |
| RL793 | Congenital disorders of the skin. Nevi. Moles |
| RM1-950 | Therapeutics. Pharmacology |
| RM138 | Drug prescribing |
| RM139 | Prescription writing |
| RM146-146.7 | Misuse of therapeutic drugs. Medication errors |
| RM147-180 | Administration of drugs and other therapeutic agents |
| RM182-190 | Other therapeutic procedures Including acupuncture, pneumatic aspiration, spinal puncture, pericardial puncture |
| RM214-258 | Diet therapy. Dietary cookbooks |
| RM259 | Vitamin therapy |
| RM260-263 | Chemotherapy |
| RM265-267 | Antibiotic therapy. Antibiotics |
| RM270-282 | Immunotherapy. Serotherapy |
| RM283-298 | Endocrinotherapy. Organotherapy |
| RM300-666 | Drugs and their actions |
| RM671-671.5 | Nonprescription drugs. Patent medicines |
| RM695-893 | Physical medicine. Physical therapy Including massage, exercise, occupational therapy, hydrotherapy, phototherapy, radiotherapy, thermotherapy, electrotherapy |
| RM930-931 | Rehabilitation therapy |
| RM950 | Rehabilitation technology |
| RS1-441 | Pharmacy and materia medica | Pharmacy and materia medica |
| RS125-131.9 | Formularies. Collected prescriptions | Formularies. Collected prescriptions |
| RS139-141.9 | Pharmacopoeias | Pharmacopoeias |
| RS151.2-151.9 | Dispensatories | Dispensatories |
| RS153-441 | Materia medica | Materia medica |
| RS160-167 | | Pharmacognosy. Pharmaceutical substances (Plant, animal, and inorganic) |
| RS189-190 | | Assay methods. Standardization. Analysis |
| RS192-199 | | Pharmaceutical technology |
| RS200-201 | | Pharmaceutical dosage forms |
| RS250-252 | | Commercial preparations. Patent medicines |
| RS355-356 | | Pharmaceutical supplies |
| RS400-431 | | Pharmaceutical chemistry |
| RS441 | | Microscopical examination of drugs |
| RT1-120 | Nursing | Nursing |
| RT89-120 | | Specialties in nursing |
| RV1-431 | Botanic, Thomsonian, and eclectic medicine | Botanic, Thomsonian, and eclectic medicine |
| RX1-681 | Homeopathy | Homeopathy |
| RX211-581 | | Diseases, treatment, etc. |
| RX601-675 | | Materia medica and therapeutics |
| RZ201-999 | Other systems of medicine |
| RZ201-275 | Chiropractic |
| RZ301-397.5 | Osteopathy |
| RZ399 | Osteo-magnetics, neuropathy, etc., A-Z |
| RZ400-408 | Mental healing |
| RZ409.7-999 | Miscellaneous systems and treatments Including magnetotherapy, mesmerism, naturopathy, organomic medicine, phrenology, radiesthesia |