Japanese encephalitis

This code represents a severe, mosquito-borne viral infection that causes inflammation of the brain. It is characterized by symptoms such as fever, headache, vomiting, and in more severe cases, seizures, paralysis, and coma, often leading to significant neurological sequelae or death.

Use this code for confirmed cases of Japanese encephalitis, typically diagnosed through serological testing (e.g., IgM antibodies in CSF or serum) or viral isolation. It is appropriate when the patient presents with the characteristic neurological symptoms following exposure in endemic areas. Documentation should clearly state the diagnosis of Japanese encephalitis.

• Ensure documentation specifies "Japanese encephalitis" to differentiate from other forms of viral encephalitis.
• Consider sequencing this code as the primary diagnosis when it is the reason for the patient's admission or encounter.
• Look for associated neurological complications (e.g., paralysis, cognitive deficits) which may require additional coding.