General Question for the Week of September 28, 2015

General Compliance Question of the Week


Is there a one-to-one match between ICD-9-CM and ICD-10?


According to the Centers for Medicare & Medicaid Services (CMS), there is not a one-to-one match between ICD-9-CM and ICD-10, and there are several reasons for that, including the following.

  • There are new concepts in ICD-10 that are not present in ICD-9-CM.
  • For a small number of codes, there is no matching code in the general equivalence mappings (GEMs).
  • There may be multiple ICD-9-CM codes for a single ICD-10 code.
  • There may be multiple ICD-10 codes for a single ICD-9-CM code.

Disclaimer: Every reasonable effort was made to ensure the accuracy of this information at the time it was published. However, due to the nature of industry changes over time we cannot guarantee its validity after the year it was published.