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I66

Non-billable

Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction

I66 is the ICD-10-CM code for Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction. It is a non-billable category code — use a more specific child code such as I66.0 for billing.

Status
Header (non-billable)
Chapter
I00-I99
Subcodes
6
Edition
FY2026

I00-I99 Diseases of the circulatory system

Includes

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

Excludes1 — not coded here

  • •Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)

Frequently asked questions

What is ICD-10 code I66?
I66 is the ICD-10-CM code for "Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction". It falls under I00-I99 Diseases of the circulatory system.
Is I66 a billable code?
No — I66 is a non-billable header code. Use a more specific child code (such as I66.0) for billing.
What are the subcodes of I66?
I66 has 6 more specific child codes, including I66.0, I66.1, I66.2.
What is excluded from I66?
Excludes1 (not coded here): Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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