ICD-10 Code I63.09 – Cerebral infarction due to thrombosis of other precerebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.09 – Cerebral infarction due to thrombosis of other precerebral artery
What it is
This code identifies an ischemic stroke caused by a blood clot in a precerebral artery other than the specifically named vessels. Use it when the record states cerebral infarction due to thrombosis and the affected precerebral artery is documented as “other.”
Clinical signs
Typical findings include sudden focal neurologic deficits such as weakness, speech difficulty, facial droop, or vision loss. Clinical features vary; refer to documentation and imaging confirmation when available.
When to use this code
Use I63.09 when the provider documents cerebral infarction from thrombosis of a precerebral artery not otherwise specified by a more exact code. It may appear in discharge summaries, stroke workups, or imaging reports that identify an ischemic infarct with arterial thrombosis. If the vessel is named more specifically, code that documented site instead.
Do not use for
Do not use this code for embolic stroke, hemorrhagic stroke, or infarction linked to a specifically named precerebral artery when another code applies. Check documentation if the mechanism or vessel location is unclear.
Coding tip
Match the code to the documented artery and stroke mechanism; if “other precerebral artery” is not explicit, verify the record before assigning I63.09.