ICD-9-CM diagnosis code (retired)
173.20 — Unspecified malignant neoplasm of skin of ear and external auditory canal
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 173.20
173.20 is an ICD-9-CM diagnosis code for unspecified malignant neoplasm of skin of ear and external auditory canal. 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, C44.201 (Unspecified malignant neoplasm of skin of unspecified ear and external auricular canal). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- C44.201Unspecified malignant neoplasm of skin of unspecified ear and external auricular canalapproximate
Common questions about 173.20
What is the ICD-10 code for ICD-9 173.20?
- The GEMs map 173.20 to ICD-10-CM C44.201.
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.