ICD-9-CM diagnosis code (retired)
341.21 — Acute (transverse) myelitis in conditions classified elsewhere
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 341.21
341.21 is an ICD-9-CM diagnosis code for acute (transverse) myelitis in conditions classified elsewhere. 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, G37.3 (Acute transverse myelitis in demyelinating disease of central nervous system). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- G37.3Acute transverse myelitis in demyelinating disease of central nervous systemapproximate
Common questions about 341.21
What is the ICD-10 code for ICD-9 341.21?
- The GEMs map 341.21 to ICD-10-CM G37.3.
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.