ICD-9-CM diagnosis code (retired)
478.4 — Polyp of vocal cord or larynx
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 478.4
478.4 is an ICD-9-CM diagnosis code for polyp of vocal cord or larynx. 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, J38.1 (Polyp of vocal cord and larynx). The match is exact.
ICD-10-CM equivalents
- J38.1Polyp of vocal cord and larynxexact match
Common questions about 478.4
What is the ICD-10 code for ICD-9 478.4?
- The GEMs map 478.4 to ICD-10-CM J38.1.
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.