ICD-10 Code I63.01 – Cerebral infarction due to thrombosis of vertebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.01 – Cerebral infarction due to thrombosis of vertebral artery
What it is
This code identifies an ischemic stroke caused by a blood clot forming in the vertebral artery. It applies when the infarction is specifically documented as due to vertebral artery thrombosis.
Clinical signs
Typical findings may include sudden neurologic deficits consistent with posterior circulation stroke. Clinical features vary; refer to documentation and imaging or neurologic assessment supporting vertebral artery involvement.
When to use this code
Use I63.01 when the provider documents cerebral infarction from thrombosis of the vertebral artery. It is appropriate when the stroke mechanism and artery are both clearly stated in the record. If the documentation only says ischemic stroke or cerebral infarction without a vessel cause, check documentation before assigning this code.
Do not use for
Do not use this code for transient ischemic attack, hemorrhagic stroke, or infarction linked to another artery. Do not assume vertebral artery thrombosis unless the record supports it.
Coding tip
Match the code to the exact documented stroke mechanism and vessel; if either is unclear, query the provider.