Current
I66 — Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
Part of Chapter 9: Diseases of the circulatory system , block Cerebrovascular diseases (I60-I69) .
Official Notes
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)
Child Codes
- 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
Referenced By
Official notes on these codes cite I66.
FY 2027 effective October 1, 2026 · CDC NCHS and CMS