ICD-10 Code A92.1 – O’nyong-nyong fever (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A92.1 – O’nyong-nyong fever
What it is
A92.1 identifies O’nyong-nyong fever, an acute viral illness transmitted by mosquitoes. Use it when documentation names this specific arboviral fever.
Clinical signs
Clinical features vary; refer to documentation. Standard descriptions include sudden fever, rash, joint pain, and marked weakness, but the diagnosis should match the provider’s recorded assessment.
When to use this code
Use A92.1 when the record clearly states O’nyong-nyong fever or confirms the infection by name. It is appropriate for confirmed or clinically diagnosed cases in outpatient, inpatient, or problem-list documentation. If the note only says “viral fever” or “arboviral illness,” check documentation for a more specific diagnosis.
Do not use for
Do not use this code for other mosquito-borne fevers, such as dengue or chikungunya, unless explicitly documented. Also avoid it when the provider has not identified O’nyong-nyong fever by name.
Coding tip
Code the most specific documented diagnosis; if the chart is vague, query or check documentation before assigning A92.1.