Australian encephalitis

This code represents Australian encephalitis, a severe arboviral infection of the central nervous system caused by the Murray Valley encephalitis virus. It is characterized by inflammation of the brain, leading to symptoms such as fever, headache, altered mental status, seizures, and neurological deficits. The disease can range from mild febrile illness to severe encephalitis with high mortality and significant long-term neurological sequelae.

Use this code when documentation clearly indicates a diagnosis of Australian encephalitis, also known as Murray Valley encephalitis. This diagnosis is typically confirmed through serological testing (e.g., IgM antibodies in CSF or serum) or PCR for the Murray Valley encephalitis virus. Clinical presentation consistent with viral encephalitis in an endemic area further supports its use.

• Ensure the documentation specifies "Australian encephalitis" or "Murray Valley encephalitis" to differentiate from other forms of viral encephalitis.
• Do not confuse this with other arboviral encephalitides unless specifically documented as such.
• Code any associated neurological complications or sequelae separately, linking them to the encephalitis if appropriate.