ICD-10 Code A92.4 – Rift Valley fever (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A92.4 – Rift Valley fever
What it is
A92.4 identifies Rift Valley fever, a mosquito-borne viral illness. Use it for documented infection with this specific arboviral disease.
Clinical signs
Clinical features vary; refer to documentation. Typical illness includes fever and flu-like symptoms, and some cases may progress to eye, brain, or liver involvement.
When to use this code
Use A92.4 when the provider documents Rift Valley fever or confirms infection with this diagnosis. It may also apply when the record clearly identifies the disease during evaluation, surveillance, or discharge coding. If the note only says “viral fever” or another unspecified arboviral illness, check documentation before assigning this code.
Do not use for
Do not use this code for other mosquito-borne viral infections, such as dengue or yellow fever. Also avoid it when Rift Valley fever is only suspected and not documented as the final diagnosis.
Coding tip
Code A92.4 only when the provider names Rift Valley fever explicitly; otherwise, verify the final documented diagnosis.