Q fever

This code represents Q fever, an infectious disease caused by the bacterium Coxiella burnetii. It typically presents as an acute febrile illness, often with pneumonia or hepatitis, but can also manifest as a chronic infection, most commonly endocarditis.

Use this code when documentation confirms a diagnosis of Q fever, whether acute or chronic. This includes cases identified through serology, PCR, or culture. It is appropriate for both initial and subsequent encounters related to the infection.

• Do not use this code for suspected or ruled-out Q fever; a confirmed diagnosis is required.
• For chronic manifestations, such as endocarditis due to Q fever, code the specific manifestation first, then sequence this code as an additional diagnosis.
• Ensure documentation specifies the organism Coxiella burnetii or explicitly states "Q fever" to support code assignment.