Emergency: 119
AMDA-IMIC

A85 Other viral encephalitis, not elsewhere classified

Category / Non-billable header 4 subcodes

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

Includes

  • specified viral encephalomyelitis NEC
  • specified viral meningoencephalitis NEC

Excludes 1 (cannot be coded together)

  • encephalitis due to cytomegalovirus (B25.8)
  • encephalitis due to herpesvirus NEC (B10.0-)
  • encephalitis due to herpesvirus [herpes simplex] (B00.4)
  • encephalitis due to measles virus (B05.0)
  • encephalitis due to mumps virus (B26.2)
  • encephalitis due to poliomyelitis virus (A80.-)
  • encephalitis due to zoster (B02.0)
  • lymphocytic choriomeningitis (A87.2)
  • myalgic encephalomyelitis (G93.32)

Subcodes

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

Code Description Billable
A85..0 Enteroviral encephalitis Yes
A85..1 Adenoviral encephalitis Yes
A85..2 Arthropod-borne viral encephalitis, unspecified Yes
A85..8 Other specified viral encephalitis Yes

Last reviewed: September 2026