A83Header code — not billable
Mosquito-borne viral encephalitis
- Chapter
- 1. Certain infectious and parasitic diseases
- Category
- A83
- Effective date
- October 1, 2026
Related codes in category A83
A83.0Japanese encephalitisYesA83.1Western equine encephalitisYesA83.2Eastern equine encephalitisYesA83.3St Louis encephalitisYesA83.4Australian encephalitisYesA83.5California encephalitisYesA83.6Rocio virus diseaseYesA83.8Other mosquito-borne viral encephalitisYesA83.9Mosquito-borne viral encephalitis, unspecifiedYes
Frequently asked questions
What is ICD-10 code A83?
A83 is an ICD-10-CM diagnosis code for Mosquito-borne viral encephalitis.
Is A83 a billable code?
No. A83 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is A83 in?
A83 falls under Chapter 1: Certain infectious and parasitic diseases.
When did A83 become effective?
A83 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to A83?
A83 belongs to category A83, which includes 9 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.