I66
Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
- Release
- FY 2027
- Effective
Official Coding Notes
Reproduced verbatim from the FY 2027 ICD-10-CM files.
Includes
embolism of cerebral artery
Includes
narrowing of cerebral artery
Includes
obstruction (complete) (partial) of cerebral artery
Includes
thrombosis of cerebral artery
Excludes1
Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)
More Specific Codes
6 codes under I66
- I66.0 Occlusion and stenosis of middle cerebral artery Has subcodes
- I66.1 Occlusion and stenosis of anterior cerebral artery Has subcodes
- I66.2 Occlusion and stenosis of posterior cerebral artery Has subcodes
- I66.3 Occlusion and stenosis of cerebellar arteries Billable
- I66.8 Occlusion and stenosis of other cerebral arteries Billable
- I66.9 Occlusion and stenosis of unspecified cerebral artery Billable
Version History
How I66 appears in each release imported from the official files, newest first.
-
FY 2027 Effective
CurrentOcclusion and stenosis of cerebral arteries, not resulting in cerebral infarction
-
FY 2026 Effective
UnchangedOcclusion and stenosis of cerebral arteries, not resulting in cerebral infarction
Related Codes
Codes whose official notes reference I66
Data Source
Code information on this page is derived from the FY 2027 ICD-10-CM files published by CDC NCHS and CMS.
- Release
- FY 2027
- Effective
- Source file
- icd10cm-code-descriptions-2027.zip
Official ICD-10-CM source files (opens in a new tab)
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