A83.1 WESTERN EQUINE ENCEPHALITIS

Code Information

Diagnosis Code: A83.1
Short Description: Western equine encephalitis
Long Description: Western equine encephalitis
Code Version: 2025 ICD-10-CM

The code A83.1 is VALID for claim submission

Code Classification

Certain infectious and parasitic diseases (A00–B99)
- Viral and prion infections of the central nervous system (A80-A89)
  - Mosquito-borne viral encephalitis (A83)

Synonyms

Encephalitis caused by Alphavirus
Invasive viral infectious disease
Neuroinvasive Western equine encephalitis virus infection
Non-neuroinvasive Western equine encephalitis virus infection
Western equine encephalitis

Crosswalk Information

ICD-10 Code		ICD-9 Code	ICD-9 Description
A83.1		062.1	West equine encephalitis

This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code	ICD-10 Description
A83	Mosquito-borne viral encephalitis
A83.0	Japanese encephalitis
A83.2	Eastern equine encephalitis
A83.3	St Louis encephalitis
A83.4	Australian encephalitis
A83.5	California encephalitis
A83.6	Rocio virus disease
A83.8	Other mosquito-borne viral encephalitis
A83.9	Mosquito-borne viral encephalitis, unspecified

This page was last updated on: 10/1/2025

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