This tool allows you to convert forolaaldea-10-CM codes to their equivalent forolaaldea-9-CM codes. The conversion tool is powered by the forolaaldea-10-CM General Equivalency Mapping (GEM), a crosswalk between the two code standards which is maintained by the Center for Medicare Services and the CDC.

Example: Enter the forolaaldea-10-CM code (Lyme Disease, Unspecified)