Converting ICD 9 to ICD10

Help with Converting Codes

The General Equivalence Mappings (GEMs) are a tool that can be used to convert data from ICD-9-CM to ICD-10-CM/PCS and vice versa. Mapping from ICD-10-CM/PCS codes back to ICD-9-CM codes is referred to as backward mapping. Mapping from ICD-9-CM codes to ICD- 10-CM/PCS codes is referred to as forward mapping. The GEMs are a comprehensive translation dictionary that can be used to accurately and effectively translate any ICD-9-CM based data, including data for:
· Tracking quality
· Recording morbidity/mortality
· Calculating reimbursement
· Converting any ICD-9-CM-based application to ICD-10-CM/PCS
The GEMs can be used by anyone who wants to convert coded data, including:
· All payers
· All providers
· Medical researchers
· Informatics professionals
· Coding professionals—to convert large data sets
· Software vendors—to use within their own products;
· Organizations—to make mappings that suit their internal purposes or that are based on their own historical data
· Others who use coded data
The GEMs are not a substitute for learning how to use the ICD-10 codes. More information about GEMs and their use can be found on the CMS website at (select from the left side of the web page ICD-10-CM or ICD-10-PCS to find the most recent GEMs).
Additional information about GEMs was provided on the following CMS sponsored conference call – May 19, 2009, “ICD-10 Implementation and General Equivalence Mappings”. Go to, scroll to the bottom of the page, under Downloads select – 2009 ICD-10 Conference Calls to locate the audio and written transcripts.

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