A83

Non-billable

Mosquito-borne viral encephalitis

A83 is the ICD-10-CM code for Mosquito-borne viral encephalitis. It is a non-billable category code — use a more specific child code such as A83.0 for billing.

Status
Header (non-billable)
Chapter
A00-B99
Subcodes
9
Edition
FY2026

A00-B99 Certain infectious and parasitic diseases

Includes

  • mosquito-borne viral meningoencephalitis

Excludes2 — not included here

  • Venezuelan equine encephalitis (A92.2)
  • West Nile fever (A92.3-)
  • West Nile virus (A92.3-)

Frequently asked questions

What is ICD-10 code A83?
A83 is the ICD-10-CM code for "Mosquito-borne viral encephalitis". It falls under A00-B99 Certain infectious and parasitic diseases.
Is A83 a billable code?
No — A83 is a non-billable header code. Use a more specific child code (such as A83.0) for billing.
What are the subcodes of A83?
A83 has 9 more specific child codes, including A83.0, A83.1, A83.2.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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