International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM)

This is the universal coding method used to document the incidence of disease, injury, mortality and illness. A diagnosis and procedure classification system designed to facilitate collection of uniform and comparable health information. The ICD-9-CM was issued in 1979. This system is used to group patients into DRGs, prepare hospital and physician billings and prepare cost reports. Classification of disease by diagnosis codified into six-digit numbers. See also coding.