ICD-10 Code B94.1 – Sequelae of viral encephalitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B94.1 – Sequelae of viral encephalitis
What it is
B94.1 identifies lingering effects that remain after a prior viral encephalitis episode has resolved. Use it for residual neurologic problems, not for the active infection itself.
Clinical signs
Clinical features vary; refer to documentation. Common sequelae may include persistent cognitive, motor, or seizure-related deficits after a documented history of viral encephalitis.
When to use this code
Use this code when the provider documents a past viral encephalitis and the current visit is for ongoing residual effects. It fits follow-up care for deficits clearly linked to the earlier illness. If the record does not show a causal link, check documentation.
Do not use for
Do not use B94.1 for active viral encephalitis or for unrelated neurologic symptoms without a documented sequela. If the condition is current or the cause is unclear, choose the more specific diagnosis.
Coding tip
Link the present deficit to the prior viral encephalitis in the note before assigning B94.1.