ICD-10 Code A92.9 – Mosquito-borne viral fever, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A92.9 – Mosquito-borne viral fever, unspecified
What it is
A92.9 identifies a mosquito-borne viral fever when the specific virus is not documented. Use it for an unspecified arboviral illness transmitted by mosquitoes.
Clinical signs
Clinical features vary; refer to documentation. Typical records may note acute fever, headache, myalgia, rash, or other nonspecific viral symptoms after mosquito exposure.
When to use this code
Use A92.9 when the chart confirms a mosquito-borne viral fever but does not name the virus. It also fits when the provider documents an arboviral fever without further specification. If the organism is identified, code the specific diagnosis instead.
Do not use for
Do not use this code for non-mosquito viral infections or for mosquito-borne diseases with a named virus. Check documentation if the record supports a more specific arboviral code.
Coding tip
Query for the exact viral agent whenever the note says “arboviral” or “mosquito-borne” without a species.