ICD-10 Code I63.339 – Cerebral infarction due to thrombosis of unspecified posterior cerebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.339 – Cerebral infarction due to thrombosis of unspecified posterior cerebral artery
What it is
This code identifies an ischemic stroke caused by a blood clot in a posterior cerebral artery, with the exact side not specified. It refers to brain tissue injury from reduced blood flow in that vessel territory.
Clinical signs
Findings depend on the affected brain region and may include sudden visual loss, visual field deficits, or sensory changes. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record documents cerebral infarction due to thrombosis of a posterior cerebral artery and does not specify right or left. It is appropriate for acute ischemic stroke documentation tied to that vessel. If the note identifies another mechanism or a different artery, choose the more specific code.
Do not use for
Do not use it for embolic stroke, hemorrhagic stroke, or infarction in a different vascular territory. Check documentation if the side, mechanism, or artery is specified elsewhere.
Coding tip
Assign the most specific stroke code available, and default to this code only when the posterior cerebral artery side is not documented.