ICD-10 Code A92.30 – West Nile virus infection, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A92.30 – West Nile virus infection, unspecified
What it is
A92.30 identifies West Nile virus infection when the chart does not specify the clinical form. Use it for documented West Nile virus disease without a more specific subtype.
Clinical signs
Clinical features vary; refer to documentation. West Nile virus infection may present with fever, headache, rash, or neurologic findings such as meningitis or encephalitis.
When to use this code
Use this code when the provider documents West Nile virus infection but does not state whether it is neuroinvasive or another specified form. It also fits records that confirm West Nile virus disease without further detail. If the note gives a more specific diagnosis, code that instead.
Do not use for
Do not use A92.30 for asymptomatic exposure, screening, or a different mosquito-borne illness. Check documentation if the record specifies West Nile fever, encephalitis, or another defined manifestation.
Coding tip
Query for specificity when the record only says “West Nile” and the clinical picture suggests a more detailed diagnosis.