Complete information about medical diagnosis codes, the ICD-9-CM Vol. 1 Code Set is used to classify diseases and a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances and external causes of injury or disease. ICD-9-CM is the official system of assigning codes to diagnoses and procedures associated with hospital utilization in the United States. The ICD-9 was used to code and classify mortality data from death certificates until 1999, when use of ICD-10 for mortality coding started. Find ICD-9-CM diagnosis codes, previously used by CMS for medical coding. Explore its numeric structure, limitations in specificity. Lookup ICD-9 codes to get official descriptors and code usage advice. Codify by AAPC helps you to crosswalk from ICD-9 to ICD-10 codes. ICD-9-CM is used to code and classify morbidity data from the inpatient and outpatient records, physician offices, and most National Center for Health Statistics (NCHS) surveys. See also International Statistical Classification of Diseases and Related Health Problems: ICD-9 – provides multiple external links for looking up ICD codes Download ICD-9-CM diagnosis and procedure code files with abbreviated and full code titles for reference, billing, and historical data use The ICD-9-CM is based on the ICD but provides for additional morbidity detail and is annually updated. ICD-9 (Ninth Revision) was introduced in 1979 and continued to be the standard for the healthcare industry for over thirty years. It employed 3-5 digit numeric codes for the classification of diseases, injuries, and medical conditions. ICD9Data.com takes the current ICD-9-CM and HCPCS medical billing codes and adds 5.3+ million links between them. Combine that with a Google-powered search engine, drill-down navigation system and instant coding notes and it's easier than ever to quickly find the medical coding information you need.