A83.1: Western equine encephalitis
A83.1 is the billable ICD-10-CM diagnosis code for Western equine encephalitis. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code A83.1?
A83.1 is the ICD-10-CM diagnosis code for Western equine encephalitis. It belongs to category A83 (Mosquito-borne viral encephalitis).
Is A83.1 a billable code?
Yes. A83.1 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does A83.1 belong to?
A83.1 is part of ICD-10-CM category A83 — Mosquito-borne viral encephalitis, which has 18 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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