ICD-9 to ICD-10: Evolution, Revolution, and Current Debates in the ...
This might happen because only a limited number (around 5 percent) of the existing ICD-9-CM codes have a one-to-one match with the ICD-10-CM codes. 33 To avoid severe problems and enable easy mapping between the classifications, CMS has developed special cross-mapping pathways called General Equivalence Mappings (GEMs). 34 However, …