ICD-9-CM diagnosis code (retired)
277.87 — Disorders of mitochondrial metabolism
ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-CM equivalents from the CMS General Equivalence Mappings.
About ICD-9-CM 277.87
277.87 is an ICD-9-CM diagnosis code for disorders of mitochondrial metabolism. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to 5 ICD-10-CM codes, such as E88.40 (Mitochondrial metabolism disorder, unspecified), E88.41 (MELAS syndrome) and E88.42 (MERRF syndrome). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 277.87
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.