ICD-9-CM diagnosis code (retired)
173.31 — Basal cell carcinoma of skin of other and unspecified parts of 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 173.31
173.31 is an ICD-9-CM diagnosis code for basal cell carcinoma of skin of other and unspecified parts of 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 3 ICD-10-CM codes, such as C44.310 (Basal cell carcinoma of skin of unspecified parts of face), C44.311 (Basal cell carcinoma of skin of nose) and C44.319 (Basal cell carcinoma of skin of other parts of face). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 173.31
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.