ICD-10 Code G46.8 – Other vascular syndromes of brain in cerebrovascular diseases (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G46.8 – Other vascular syndromes of brain in cerebrovascular diseases
What it is
G46.8 identifies vascular brain syndromes that do not fit a more specific cerebrovascular category. Use it when the record describes a brain syndrome caused by vascular disease, but the exact named syndrome is not documented.
Clinical signs
Clinical features vary; refer to documentation. Findings may include focal neurologic deficits, changes in speech, sensation, coordination, or cognition consistent with a vascular brain syndrome.
When to use this code
Use this code when the provider documents an “other” vascular syndrome of the brain linked to cerebrovascular disease and no more specific code is supported. It may apply when the syndrome is clearly vascular, but the chart does not name a distinct subtype. Check documentation for the underlying cerebrovascular condition.
Do not use for
Do not use G46.8 if the record identifies a more specific cerebrovascular syndrome or a nonvascular neurologic disorder. Do not assign it when documentation is vague and does not support a vascular brain syndrome.
Coding tip
Code the documented cerebrovascular diagnosis first when the record supports an underlying cause.