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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)