Emergency: 119
AMDA-IMIC

A83 Mosquito-borne viral encephalitis

Category / Non-billable header 9 subcodes

Block: Viral and prion infections of the central nervous system (A80-A89)

Includes

  • mosquito-borne viral meningoencephalitis

Excludes 2 (not included here)

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

Subcodes

Each subcode links to a detail page with full clinical annotations.

Code Description Billable
A83..0 Japanese encephalitis Yes
A83..1 Western equine encephalitis Yes
A83..2 Eastern equine encephalitis Yes
A83..3 St Louis encephalitis Yes
A83..4 Australian encephalitis Yes
A83..5 California encephalitis Yes
A83..6 Rocio virus disease Yes
A83..8 Other mosquito-borne viral encephalitis Yes
A83..9 Mosquito-borne viral encephalitis, unspecified Yes

Last reviewed: September 2026