ICD-10 Code I63.311 – Cerebral infarction due to thrombosis of right middle cerebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.311 – Cerebral infarction due to thrombosis of right middle cerebral artery
What it is
This code identifies an ischemic stroke caused by a blood clot blocking the right middle cerebral artery. It specifies the infarction is due to thrombosis, not embolism or another stroke mechanism.
Clinical signs
Typical findings include sudden focal neurologic deficits consistent with right MCA territory injury. Clinical features vary; refer to documentation for documented weakness, sensory loss, speech disturbance, or visual field changes.
When to use this code
Use this code when the provider documents cerebral infarction from thrombosis of the right middle cerebral artery. It fits confirmed ischemic stroke cases with that exact vessel and cause. If the mechanism or laterality is not clearly stated, check documentation before coding.
Do not use for
Do not use this code for embolic stroke, hemorrhagic stroke, or infarction without documented right-sided middle cerebral artery thrombosis. If the record only says “stroke” or “CVA,” you need more specific documentation.
Coding tip
Verify both laterality and cause; I63.311 requires right MCA thrombosis specifically.