ICD-9-CM Diagnosis Codes Index ICD-9-CM
The final ICD-9-CM release contains 14,567 diagnosis codes organized into 20 chapters, including the supplementary V-code and E-code classifications. ICD-9-CM was retired on October 1, 2015, when ICD-10-CM replaced it on U.S. claims. This index preserves the full legacy hierarchy, and every code page links its ICD-10-CM replacement under the CMS General Equivalence Mappings.
Retired Code Set
ICD-9-CM stopped being valid for U.S. claims with dates of service on or after October 1, 2015, when ICD-10-CM replaced it. Use this index for historical lookups and crosswalking; for current coding, start from the ICD-10-CM codes list or the ICD-9 / ICD-10 converter.
ICD-9-CM Chapters 20 chapters · 14,567 codes
The info icon previews what each row contains.
Questions About This Page
Is ICD-9 still a valid code set?
No. The United States retired ICD-9-CM after September 30, 2015, and claims with later dates of service must use ICD-10-CM. This index remains useful for historical records, research, and crosswalking old claims: every code page here shows its ICD-10-CM replacement, and the ICD-9 / ICD-10 converter translates codes in both directions.
How is the ICD-9-CM index organized?
The classification runs from chapter to section to code block to code. The 20 chapters above cover diagnosis codes 001 through 999 plus two supplementary classifications: V codes for factors influencing health status and E codes for external causes of injury.
How many ICD-9-CM codes are there?
The final release contains 14,567 diagnosis codes. ICD-10-CM, its replacement, is far more specific with over 98,000 codes, which is why many legacy codes map to several current candidates in the CMS General Equivalence Mappings.
Related References
Source: final CMS ICD-9-CM release (version date October 1, 2014). Retired from U.S. claims after September 30, 2015.
