Omsk hemorrhagic fever

This code represents Omsk hemorrhagic fever, a tick-borne viral zoonosis characterized by fever, headache, myalgia, and hemorrhagic manifestations such as epistaxis, gingival bleeding, and gastrointestinal hemorrhage. It can also present with neurological symptoms like meningitis or meningoencephalitis in severe cases. The disease is endemic to western Siberia.

Assign this code for confirmed cases of Omsk hemorrhagic fever based on laboratory identification of the Omsk hemorrhagic fever virus or strong epidemiological evidence in conjunction with characteristic clinical symptoms. Documentation should clearly indicate the diagnosis of Omsk hemorrhagic fever, often supported by serological tests or PCR.

• Ensure documentation specifies Omsk hemorrhagic fever and not other hemorrhagic fevers, as many have distinct codes.
• Do not confuse with other tick-borne diseases; confirm the specific viral etiology.
• Code any associated complications, such as meningitis or hemorrhage, as secondary diagnoses.