Mosquito-borne viral encephalitis, unspecified

This code represents an acute inflammation of the brain caused by a viral infection transmitted by mosquitoes, where the specific type of mosquito-borne virus is not identified. Patients typically present with fever, headache, altered mental status, and neurological deficits, following exposure to mosquito bites.

Assign this code when documentation confirms a diagnosis of viral encephalitis and explicitly states a mosquito vector, but the specific viral etiology (e.g., West Nile, St. Louis, Japanese encephalitis) is not specified. This code is appropriate when laboratory testing for specific viruses is pending or inconclusive, or when the physician's final diagnosis is "mosquito-borne viral encephalitis, unspecified."

• Do not use this code if the specific type of mosquito-borne viral encephalitis is known; instead, use the more specific code (e.g., 062.3 for West Nile encephalitis).
• Ensure documentation clearly links the encephalitis to a mosquito vector; otherwise, consider codes for unspecified viral encephalitis (e.g., 062.9).
• Sequence this code as the primary diagnosis when it is the reason for the encounter.