Rift Valley fever

This code represents an acute, mosquito-borne viral zoonosis primarily affecting animals but transmissible to humans. Symptoms in humans range from a mild, self-limiting febrile illness to severe forms involving hemorrhagic fever, encephalitis, or ocular disease. The disease is endemic to sub-Saharan Africa and the Arabian Peninsula.

Use this code for confirmed cases of Rift Valley fever in human patients. Documentation should clearly indicate a diagnosis of Rift Valley fever, often supported by laboratory confirmation (e.g., PCR, serology) or strong epidemiological links to an outbreak area. This code is appropriate for both initial and subsequent encounters related to the infection.

• Ensure documentation specifies "Rift Valley fever" and not a generic viral fever, as this is a specific arboviral disease.
• Consider additional codes for specific manifestations, such as hemorrhagic complications (e.g., R58) or encephalitis (e.g., G04.90), if documented.
• This code is geographically specific; confirm patient travel history or exposure in endemic regions if not explicitly stated.