ICD-9-CM diagnosis code (retired)
173.42 — Squamous cell carcinoma of scalp and skin of neck
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 173.42
173.42 is an ICD-9-CM diagnosis code for squamous cell carcinoma of scalp and skin of neck. 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 one ICD-10-CM code, C44.42 (Squamous cell carcinoma of skin of scalp and neck). The match is exact.
ICD-10-CM equivalents
- C44.42Squamous cell carcinoma of skin of scalp and neckexact match
Common questions about 173.42
What is the ICD-10 code for ICD-9 173.42?
- The GEMs map 173.42 to ICD-10-CM C44.42.
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.