I66.01
✓ Billable
Occlusion and stenosis of right middle cerebral artery
ICD-10-CM · FY2026 · Diseases of the Circulatory System
Code
I66.01
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Circulatory System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code I66.01?
ICD-10-CM code I66.01 represents Occlusion and stenosis of right middle cerebral artery. It is a billable diagnosis code in the Diseases of the Circulatory System chapter, effective October 1, 2025 – September 30, 2026.
Is I66.01 billable?
Yes. I66.01 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is I66.01 in?
I66.01 belongs to the Diseases of the Circulatory System chapter (I00–I99) of ICD-10-CM.
Related codes in the I66 category
I66
Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
Non-billable
I66.0
Occlusion and stenosis of middle cerebral artery
Non-billable
I66.1
Occlusion and stenosis of anterior cerebral artery
Non-billable
I66.2
Occlusion and stenosis of posterior cerebral artery
Non-billable
I66.3
Occlusion and stenosis of cerebellar arteries
Billable
I66.8
Occlusion and stenosis of other cerebral arteries
Billable
I66.9
Occlusion and stenosis of unspecified cerebral artery
Billable
I66.02
Occlusion and stenosis of left middle cerebral artery
Billable
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