ICD-10 Code I63.59 – Cerebral infarction due to unspecified occlusion or stenosis of other cerebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.59 – Cerebral infarction due to unspecified occlusion or stenosis of other cerebral artery
What it is
This code identifies an ischemic stroke caused by blockage or narrowing in a cerebral artery not named elsewhere. Use it when documentation specifies infarction from an unspecified occlusion or stenosis of another cerebral artery.
Clinical signs
Clinical features vary; refer to documentation. Typical findings of cerebral infarction may include sudden focal neurologic deficits such as weakness, speech disturbance, facial droop, or visual loss.
When to use this code
Use I63.59 when the provider documents cerebral infarction and identifies an occluded or stenosed cerebral artery, but the vessel is not otherwise specified in the record. It also fits when the chart states “other cerebral artery” without naming a more specific artery. Check documentation if the cause is unclear or if the event is not confirmed as infarction.
Do not use for
Do not use this code for hemorrhagic stroke, transient ischemic attack, or cerebral infarction tied to a specifically named artery when a more precise code is available. Check documentation if the note only describes symptoms or suspected stroke.
Coding tip
Code the documented artery level exactly, and choose a more specific I63 code whenever the affected cerebral vessel is named.