I66.8

I66.8: Occlusion and stenosis of other cerebral arteries

Billable / specific codeICD-10-CM

I66.8 is a billable, specific ICD-10-CM code for occlusion and stenosis of other cerebral arteries. It is valid for submission on a claim.

Check I66.8 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Occlusion and stenosis of perforating arteries

Excludes1 inherited from the categories above I66.8

A category’s note binds every code beneath it.

Written on I66: Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction

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

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

I66.8 is named in 35 Medicare coverage policies: 35 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A52992Billing and Coding: Non-Invasive Cerebrovascular Arterial Studies
A56423Billing and Coding: Cardiology Non-emergent Outpatient Stress Testing
A56476Billing and Coding: Cardiac Radionuclide Imaging
A56505Billing and Coding: Transesophageal Echocardiography (TEE)

Alphabetic index entries that lead here

Embolism›meninges
Thrombosis, thrombotic›meninges(brain) (arterial)
Occlusion, occluded›artery›cerebral›specified NEC

Code history

Unchanged in every release from FY2024 to FY2027.