ICD-10 Code G46.4 – Cerebellar stroke syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G46.4 – Cerebellar stroke syndrome
What it is
G46.4 identifies a cerebellar stroke syndrome, meaning neurologic problems caused by interrupted blood flow affecting the cerebellum. Use it when the record documents stroke-related cerebellar dysfunction rather than a general stroke diagnosis.
Clinical signs
Typical findings include ataxia, unsteady gait, dysmetria, vertigo, nystagmus, and coordination problems. Clinical features vary; refer to documentation, especially when symptoms overlap with brainstem or other posterior circulation deficits.
When to use this code
Use this code when the provider links the patient’s cerebellar signs to a stroke syndrome involving the cerebellum. It may appear in acute or follow-up documentation after an ischemic event affecting posterior circulation.
Code it when the chart clearly describes cerebellar stroke syndrome, not just nonspecific dizziness or imbalance. If the documentation names a different cerebrovascular condition, follow that diagnosis instead.
Do not use for
Do not use G46.4 for isolated vertigo, ataxia, or gait instability without a documented stroke syndrome. Check documentation if the record describes hemorrhage, TIA, or another neurologic disorder.
Coding tip
Confirm that the provider explicitly connects cerebellar findings to stroke before assigning G46.4.