I66
I66: Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
Non-billable headerICD-10-CM
I66 is a non-billable header ICD-10-CM code for occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
Includes
Conditions this code covers.
- embolism of cerebral artery
- narrowing of cerebral artery
- obstruction (complete) (partial) of cerebral artery
- thrombosis of cerebral artery
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead I66
6 child codes. Green means billable.
- I66.0Occlusion and stenosis of middle cerebral artery
- I66.1Occlusion and stenosis of anterior cerebral artery
- I66.2Occlusion and stenosis of posterior cerebral artery
- I66.3Occlusion and stenosis of cerebellar arteries
- I66.8Occlusion and stenosis of other cerebral arteries
- I66.9Occlusion and stenosis of unspecified cerebral artery