A83.9

A83.9: Mosquito-borne viral encephalitis, unspecified

Billable / specific codeICD-10-CM

A83.9 is a billable, specific ICD-10-CM code for mosquito-borne viral encephalitis, unspecified. It is valid for submission on a claim.

Check A83.9 with the rest of the claim: free scrubber

Excludes2 inherited from the categories above A83.9

Not part of this code, but both may be coded when both are present.

Written on A83: Mosquito-borne viral encephalitis

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

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

A83.9 is named in 2 Medicare coverage policies: 2 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A56612Billing and Coding: CT of the Head
A56771Billing and Coding: Special Electroencephalography

Alphabetic index entries that lead here

Borna disease
Disease, diseased›Borna
Encephalitis›equine(acute) (infectious) (viral)
Encephalomyelitis›equine
Encephalitis›viral, virus›arthropod-borne NEC›mosquito-borne

Code history

Unchanged in every release from FY2024 to FY2027.