Glossary of Health Care and Medical Terms

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General Equivalence Mappings (GEMs) were designed as a general purpose translation tool that can be used by anyone who wants to convert coded data.

GEMs were developed by CMS and CDC, with input from Cooperating Parties:


  • American Hospital Association (AHA)

  • American Health Information Management Association (AHIMA) and

  • the team that developed and maintains ICD-10-PCS.


The GEMs are a tool to assist with converting larger ICD-9-CM databases to ICD-10-CM and ICD-10-PCS. For example, GEMs are used to:

  • Convert Medicare Severity-Diagnosis Related Groups (MS-DRGs) from an ICD-9-CM-based application to an ICD-10-CM/PCS-based application;

  • Convert the Medicare Code Editor to a native ICD-10-CM/PCS-based application; and

  • Produce a purpose-built ICD-10-CM/PCS to ICD-9-CM crosswalk for reimbursement called the “ICD-10 Reimbursement Mappings."


Also see: ICD-10-CM, ICD-10-PCS

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