ICD-9-CM diagnosis code (retired)
173.51 — Basal cell carcinoma of skin of trunk, except scrotum
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 173.51
173.51 is an ICD-9-CM diagnosis code for basal cell carcinoma of skin of trunk, except scrotum. 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 C44.510 (Basal cell carcinoma of anal skin), C44.511 (Basal cell carcinoma of skin of breast) and C44.519 (Basal cell carcinoma of skin of other part of trunk). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 173.51
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.