ICD-9-CM diagnosis code (retired)
330.9 — Unspecified cerebral degeneration in childhood
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 330.9
330.9 is an ICD-9-CM diagnosis code for unspecified cerebral degeneration in childhood. 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, G31.9 (Degenerative disease of nervous system, unspecified). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- G31.9Degenerative disease of nervous system, unspecifiedapproximate
Common questions about 330.9
What is the ICD-10 code for ICD-9 330.9?
- The GEMs map 330.9 to ICD-10-CM G31.9.
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.