ICD-10 Code A83.6 – Rocio virus disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A83.6 – Rocio virus disease
What it is
A83.6 identifies Rocio virus disease, a mosquito-borne viral infection. Use it for documented illness caused by Rocio virus, not for unspecified viral encephalitis or other arboviral infections.
Clinical signs
Clinical features vary; refer to documentation. Reported illness may include fever and neurologic involvement such as headache, altered mental status, seizures, or encephalitis when specifically linked to Rocio virus.
When to use this code
Use A83.6 when the provider documents Rocio virus disease, Rocio virus infection, or Rocio virus encephalitis. It is appropriate when the diagnosis is confirmed or clearly stated in the record. If the chart only says viral encephalitis or arboviral disease, check documentation before assigning this code.
Do not use for
Do not use this code for unspecified viral meningitis, encephalitis, or other mosquito-borne infections unless Rocio virus is documented. Check documentation if the organism is not identified.
Coding tip
Code the specific viral cause only when the record names Rocio virus; otherwise, assign the more general documented diagnosis.