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  5. Category I66
Category I66

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

Clinical Classification Guidelines

Specific Diagnosis Codes

Occlusion and stenosis of middle cerebral artery
I66.0
Occlusion and stenosis of right middle cerebral artery
I66.01
Occlusion and stenosis of left middle cerebral artery
I66.02
Occlusion and stenosis of bilateral middle cerebral arteries
I66.03
Occlusion and stenosis of unspecified middle cerebral artery
I66.09
Occlusion and stenosis of anterior cerebral artery
I66.1
Occlusion and stenosis of right anterior cerebral artery
I66.11
Occlusion and stenosis of left anterior cerebral artery
I66.12
Occlusion and stenosis of bilateral anterior cerebral arteries
I66.13
Occlusion and stenosis of unspecified anterior cerebral artery
I66.19
Occlusion and stenosis of posterior cerebral artery
I66.2
Occlusion and stenosis of right posterior cerebral artery
I66.21
Occlusion and stenosis of left posterior cerebral artery
I66.22
Occlusion and stenosis of bilateral posterior cerebral arteries
I66.23
Occlusion and stenosis of unspecified posterior cerebral artery
I66.29
Occlusion and stenosis of cerebellar arteries
I66.3
Occlusion and stenosis of other cerebral arteries
I66.8
Occlusion and stenosis of unspecified cerebral artery
I66.9
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Data updated for October 2025 release.

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