ICD-10 Code I63.333 – Cerebral infarction due to thrombosis of bilateral posterior cerebral arteries (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.333 – Cerebral infarction due to thrombosis of bilateral posterior cerebral arteries
What it is
This code identifies an ischemic stroke caused by a blood clot blocking both posterior cerebral arteries. It refers to infarction in the brain areas supplied by those vessels.
Clinical signs
Typical findings may include sudden neurologic deficits such as visual field loss, confusion, memory problems, or weakness. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents cerebral infarction due to thrombosis affecting both posterior cerebral arteries. The record should support an ischemic stroke in the posterior circulation, not a hemorrhage or transient ischemic attack. If laterality or mechanism is unclear, check documentation.
Do not use for
Do not use this code for embolic stroke, cerebral hemorrhage, or unspecified infarction. Also avoid it when the chart does not clearly document bilateral posterior cerebral artery thrombosis.
Coding tip
Verify both the vascular territory and the cause of occlusion before assigning I63.333.