I66.9: Occlusion and stenosis of unspecified cerebral artery
I66.9 is the billable ICD-10-CM diagnosis code for Occlusion and stenosis of unspecified cerebral artery. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code I66.9?
I66.9 is the ICD-10-CM diagnosis code for Occlusion and stenosis of unspecified cerebral artery. It belongs to category I66 (Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction).
Is I66.9 a billable code?
Yes. I66.9 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does I66.9 belong to?
I66.9 is part of ICD-10-CM category I66 — Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction, which has 30 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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