I66

Classification

Category:Diseases of the circulatory system

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Coding Guidance

I66 should not be used for reimbursement purposes as there are more specific codes below it that contain a greater level of detail.

Inclusion Terms

embolism of cerebral artery
narrowing of cerebral artery
obstruction (complete) (partial) of cerebral artery
thrombosis of cerebral artery

Excludes 1

Excludes 2

More Specific Codes

I66.0

Occlusion and stenosis of middle cerebral artery

I66.1

Occlusion and stenosis of anterior cerebral artery

I66.2

Occlusion and stenosis of posterior cerebral artery

I66.3

Occlusion and stenosis of cerebellar arteries

I66.8

Occlusion and stenosis of other cerebral arteries

I66.9

Occlusion and stenosis of unspecified cerebral artery

External Resources

2025 ICD-10 guidelines from CMS.gov