I63.21 — Cerebral infrc due to unsp occls or stenosis of verteb art

I63.21 is the ICD-10-CM 2025 code for Cerebral infrc due to unsp occls or stenosis of verteb art. Cerebral infarction due to unspecified occlusion or stenosis of vertebral arteries. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.

I63.21 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under I63.21. Browse the sub-codes listed on this page.

I63.21 belongs to the chapter "Diseases of the circulatory system" (codes I00-I99). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.

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