ICD-10 Code I63.033 – Cerebral infarction due to thrombosis of bilateral carotid arteries (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.033 – Cerebral infarction due to thrombosis of bilateral carotid arteries
What it is
This code identifies an ischemic stroke caused by a blood clot blocking both carotid arteries. It documents cerebral infarction specifically linked to bilateral carotid artery thrombosis.
Clinical signs
Typical findings include sudden focal neurologic deficits such as weakness, speech difficulty, facial droop, or vision changes. Clinical features vary; refer to documentation and imaging confirmation when available.
When to use this code
Use this code when the provider documents cerebral infarction due to thrombosis of both carotid arteries. It is appropriate when the stroke mechanism is clearly stated as bilateral carotid thrombosis, not merely carotid disease. If the record only says ischemic stroke or carotid occlusion without laterality, check documentation.
Do not use for
Do not use it for embolic stroke, hemorrhagic stroke, or infarction from unilateral carotid thrombosis. Do not assign it when the documentation does not specify bilateral carotid involvement.
Coding tip
Verify the stroke mechanism and laterality in the provider note before coding.