ICD-10 Code I63.549 – Cerebral infarction due to unspecified occlusion or stenosis of unspecified cerebellar artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.549 – Cerebral infarction due to unspecified occlusion or stenosis of unspecified cerebellar artery
What it is
This code identifies an ischemic stroke in the cerebellum caused by blockage or narrowing of a cerebellar artery, when the specific artery and cause are not further specified. Use it when documentation confirms infarction but remains nonspecific.
Clinical signs
Clinical features may include sudden dizziness, imbalance, ataxia, nausea, vomiting, or limb coordination problems. Imaging or documentation should support cerebellar infarction; clinical features vary, so refer to documentation.
When to use this code
Use this code when the record states cerebellar infarction due to unspecified occlusion or stenosis of an unspecified cerebellar artery. It fits cases where the provider documents ischemic stroke in the cerebellum but does not name the exact vessel. If laterality, artery, or mechanism is specified, choose the more precise code.
Do not use for
Do not use this code for hemorrhagic stroke, transient ischemic attack, or cerebellar symptoms without confirmed infarction. Check documentation if the record identifies a different artery or a noncerebellar stroke.
Coding tip
Verify that the note supports both infarction and an unspecified cerebellar artery before assigning I63.549.