I63.21
⚠ Non-billable (Header)Cerebral infarction due to unspecified occlusion or stenosis of vertebral arteries
Diseases of the circulatory system (I00-I99)
⚠️ This is a category header code — not billable. Use a more specific child code below.
✅ No additional coding notes for I63.21
Child Codes (4)
I63.211Cerebral infarction due to unspecified occlusion or stenosis of right vertebral arteryI63.212Cerebral infarction due to unspecified occlusion or stenosis of left vertebral arteryI63.213Cerebral infarction due to unspecified occlusion or stenosis of bilateral vertebral arteriesI63.219Cerebral infarction due to unspecified occlusion or stenosis of unspecified vertebral artery
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CodeI63.21
BillableNo — Header code
ParentI63.2
CategoryDiseases of the circulatory system (I00-I99)
Excludes10 rule(s)
Excludes20 note(s)
Child codes4
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)