ICD-9 followed by International Classification of Diseases, Tenth Revision (ICD-10)
ICD-9-CM (United States)
The International Classification of Diseases, Clinical Modification (ICD-9-CM) was an adaptation created by the US National Center for Health Statistics (NCHS) and used in assigning diagnostic and procedure codes associated with inpatient, outpatient, and physician office utilization in the United States. The ICD-9-CM is based on the ICD-9 but provides for additional morbidity detail. It was updated annually on October 1.It consists three volumes: