I66
Non-billableOcclusion 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
What this means — in plain language
MedlinePlus · NIHYour brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body. Your nerves take in information from your senses and send it to the brain to be processed. Your brain…
Read more about Brain Diseases at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Includes
- •embolism of cerebral artery
- •narrowing of cerebral artery
- •obstruction (complete) (partial) of cerebral artery
- •thrombosis of cerebral artery
Excludes1 — not coded here
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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