The Centers for Medicare & Medicaid Services has released an updated version of the General Equivalence Mappings (GEMs) that provides a reference of corresponding codes between International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) and International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM). The 2014 GEMs may be downloaded from www.cms.gov/Medicare/Coding/ICD10/2014-ICD-10-CM-and-GEMs-.html.

The GEMs are a useful translation tool for narrowing the selection of ICD-10-CM codes that are the same or nearly the same as an ICD-9-CM code. When there is no exact one-to-one cross between the code sets, mappings are approximate, while others are an equivalent one-to-one crosswalk. For instance, ICD-10-CM code Z00.110, health examination for newborn under 8 days old, is an equivalent match or one-to-one cross to ICD-9-CM code V20.31, health supervision for newborn under 8 days old. On the other hand, ICD-9-CM code V70.3, other medical examination for administrative purposes, is...

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