All ICD10 Codes

I66.0

Non-Billable
ChapterI00–I99
Ranksubcategory
Official Description

Occlusion and stenosis of middle cerebral artery

Use a more specific code (4 billable)
I66.01Occlusion and stenosis of right middle cerebral arteryI66.02Occlusion and stenosis of left middle cerebral arteryI66.03Occlusion and stenosis of bilateral middle cerebral arteriesI66.09Occlusion and stenosis of unspecified middle cerebral artery
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 9: Diseases of the Circulatory System (I00-I99).
General instructions are available for the parent sections:
View CH9 NotesView I60-I69 NotesView I66 Notes

Clinical Hierarchy

BillableHas subcodes
CH9Diseases of the circulatory system (I00-I99)
I60-I69Cerebrovascular diseases (I60-I69)
I66Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
I66.0Occlusion and stenosis of middle cerebral arteryNot billable
I66.01Occlusion and stenosis of right middle cerebral arteryBillable
I66.02Occlusion and stenosis of left middle cerebral arteryBillable
I66.03Occlusion and stenosis of bilateral middle cerebral arteriesBillable
I66.09Occlusion and stenosis of unspecified middle cerebral arteryBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I66.0:

categoryI66
Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
View context instructions
blockI60-I69
Cerebrovascular diseases (I60-I69)
View context instructions
chapterCH9
Diseases of the circulatory system (I00-I99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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