ICD-10 Code I63.112 – Cerebral infarction due to embolism of left vertebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.112 – Cerebral infarction due to embolism of left vertebral artery
What it is
This code identifies an ischemic stroke caused by an embolus blocking the left vertebral artery. It indicates reduced blood flow to posterior circulation brain tissue supplied by that artery.
Clinical signs
Clinical features vary; refer to documentation. Typical posterior circulation findings may include dizziness, vertigo, ataxia, diplopia, dysarthria, or unilateral weakness, but the record should confirm the infarct and embolic source.
When to use this code
Use I63.112 when the provider documents cerebral infarction specifically due to embolism of the left vertebral artery. The diagnosis should link the stroke to that vessel, not just to a general vertebrobasilar or cerebral artery event.
Code it from discharge summaries, imaging reports, or specialist notes when the left vertebral artery embolic source is clearly stated. Check documentation if the side, vessel, or mechanism is unclear.
Do not use for
Do not use this code for hemorrhagic stroke, transient ischemic attack, or infarction from thrombosis or unspecified occlusion. Do not assume left-sided involvement unless it is documented.
Coding tip
Verify both the artery side and the embolic mechanism before assigning this code.