ICD-10 Code I63.543 – Cerebral infarction due to unspecified occlusion or stenosis of bilateral cerebellar arteries (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.543 – Cerebral infarction due to unspecified occlusion or stenosis of bilateral cerebellar arteries
What it is
This code identifies an ischemic stroke in the cerebellum caused by reduced blood flow from an unspecified blockage or narrowing in both cerebellar arteries. Use it when the infarction is documented and the bilateral cerebellar artery involvement is specified.
Clinical signs
Clinical features vary; refer to documentation. Common cerebellar stroke findings include dizziness, gait imbalance, limb incoordination, nausea, vomiting, and nystagmus, with imaging confirming infarction in the cerebellar territory.
When to use this code
Use I63.543 when the record states cerebral infarction due to unspecified occlusion or stenosis affecting both cerebellar arteries. It fits acute ischemic stroke documentation where the vessel lesion is not further defined and the bilateral cerebellar arteries are named. If the chart only says “stroke” or lacks vascular detail, check documentation.
Do not use for
Do not use this code for hemorrhagic stroke, transient ischemic attack, or cerebellar symptoms without confirmed infarction. Avoid it when the affected artery is unilateral or when a different specific cerebrovascular artery is documented.
Coding tip
Code from the provider’s documented vessel and laterality; if bilateral cerebellar artery involvement is not explicitly stated, verify the note before assigning I63.543.