ICD-9-CM diagnosis code (retired)
209.31 — Merkel cell carcinoma of the face
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 209.31
209.31 is an ICD-9-CM diagnosis code for Merkel cell carcinoma of the face. 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 C4A.0 (Merkel cell carcinoma of lip), C4A.10 (Merkel cell carcinoma of unspecified eyelid, including canthus) and C4A.20 (Merkel cell carcinoma of unspecified ear and external auricular canal). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
- C4A.0Merkel cell carcinoma of lipapproximate
- C4A.10Merkel cell carcinoma of unspecified eyelid, including canthusapproximate
- C4A.20Merkel cell carcinoma of unspecified ear and external auricular canalapproximate
- C4A.30Merkel cell carcinoma of unspecified part of faceapproximate
- C4A.39Merkel cell carcinoma of other parts of faceapproximate
Common questions about 209.31
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.