Mosquito-borne viral encephalitis, unspecified

This code signifies an acute inflammation of the brain caused by a viral infection transmitted by mosquitoes, where the specific type of virus is not identified. It encompasses the neurological manifestations resulting from such an infection, without further etiological detail.

Use this code when documentation confirms a diagnosis of viral encephalitis and explicitly states mosquito transmission, but the specific arbovirus (e.g., West Nile, St. Louis, Eastern Equine) is not specified. This code is appropriate when laboratory testing for specific mosquito-borne viruses is pending, inconclusive, or not performed.

• Avoid using this code if a more specific mosquito-borne viral encephalitis (e.g., West Nile encephalitis) is documented; use the specific code instead.
• Always review documentation for the specific type of arbovirus; if identified, a more precise code from the A83 series should be selected.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter, followed by codes for any associated neurological complications.