ICD-10 Code I63.343 – Cerebral infarction due to thrombosis of bilateral cerebellar arteries (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.343 – Cerebral infarction due to thrombosis of bilateral cerebellar arteries
What it is
This code identifies an ischemic stroke caused by a blood clot blocking both cerebellar arteries. It means the cerebellum has suffered infarction because of arterial thrombosis.
Clinical signs
Typical findings include sudden dizziness, gait unsteadiness, limb incoordination, nausea, vomiting, and difficulty with balance or speech. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents a cerebral infarction specifically due to thrombosis of both cerebellar arteries. The record should support an acute ischemic stroke involving the cerebellum, not a hemorrhage or nonspecific stroke. If laterality or cause is unclear, check documentation.
Do not use for
Do not use it for cerebellar infarction from embolism, occlusion without thrombosis, or stroke in another vascular territory. Do not assign it when the diagnosis is only suspected or not documented.
Coding tip
Confirm both the mechanism and the bilateral cerebellar artery location before assigning I63.343.