ICD-9-CM diagnosis code (retired)
434.90 — Cerebral artery occlusion, unspecified without mention of cerebral infarction
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 434.90
434.90 is an ICD-9-CM diagnosis code for cerebral artery occlusion, unspecified without mention of cerebral infarction. 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, I66.9 (Occlusion and stenosis of unspecified cerebral artery). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- I66.9Occlusion and stenosis of unspecified cerebral arteryapproximate
Common questions about 434.90
What is the ICD-10 code for ICD-9 434.90?
- The GEMs map 434.90 to ICD-10-CM I66.9.
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.