Chlamydia psittaci infections

This code represents infections caused by Chlamydia psittaci, a bacterium primarily transmitted from birds to humans. The resulting illness, psittacosis (also known as ornithosis or parrot fever), typically manifests as an atypical pneumonia, but can also present with systemic symptoms like fever, headache, myalgia, and hepatosplenomegaly.

Use this code when documentation confirms a diagnosis of psittacosis, often following exposure to infected birds (e.g., parrots, parakeets, pigeons, poultry). Supporting documentation should include laboratory confirmation of Chlamydia psittaci infection or a strong clinical diagnosis in the context of relevant exposure history.

• Do not confuse with other Chlamydia species infections (e.g., C. trachomatis or C. pneumoniae), which have distinct codes.
• Code any associated manifestations, such as pneumonia (J16.8), in addition to the primary infection.
• Ensure the medical record clearly specifies Chlamydia psittaci as the causative agent.