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- La Crosse encephalitis
- A83.6 Rocio virus disease
- A83.8 Other mosquito-borne viral encephalitis
- A83.9 Mosquito-borne viral encephalitis, unspecified
A84 Tick-borne viral encephalitis
- Includes: tick-borne viral meningoencephalitis
- A84.0 Far Eastern tick-borne encephalitis [Russian spring-summer encephalitis]
- A84.1 Central European tick-borne encephalitis
- A84.8 Other tick-borne viral encephalitis
- Louping ill
- Powassan virus disease
- A84.9 Tick-borne viral encephalitis, unspecified
A85 Other viral encephalitis, not elsewhere classified
- Includes: specified viral encephalomyelitis NEC
- specified viral meningoencephalitis NEC
- Excludes1: benign myalgic encephalomyelitis (G93.3)
- encephalitis due to:
- cytomegalovirus (B25.8)
- herpesvirus NEC (B10.0-)
- herpesvirus [herpes simplex] (B00.4)
- measles virus (B05.0)
- mumps virus (B26.2)
- poliomyelitis virus (A80.-)
- zoster (B02.0)
- lymphocytic choriomeningitis (A87.2)
A85.0 Enteroviral encephalitis
- Enteroviral encephalomyelitis
- A85.1 Adenoviral encephalitis
- Adenoviral meningoencephalitis
- A85.2 Arthropod-borne viral encephalitis, unspecified
- Excludes1: West nile virus with encephalitis (A92.31)
- A85.8 Other specified viral encephalitis
- Encephalitis lethargica
- Von Economo-Cruchet disease
A86 Unspecified viral encephalitis
- Includes: viral encephalomyelitis NOS
- viral meningoencephalitis NOS
A87 Viral meningitis
- Excludes1: meningitis due to:
- herpesvirus [herpes simplex] (B00.3)
- measles virus (B05.1)
- mumps virus (B26.1)
