Typhus fever due to Rickettsia typhi

This code represents murine typhus, an acute febrile illness caused by the bacterium Rickettsia typhi. It is characterized by fever, headache, rash, and myalgia, and is transmitted to humans primarily through infected flea feces. The disease typically has a milder course compared to epidemic typhus.

Use this code when documentation explicitly states a diagnosis of typhus fever confirmed to be caused by Rickettsia typhi. This diagnosis is often supported by serological testing or PCR. It is appropriate for cases of endemic or murine typhus.

• Differentiate carefully from other forms of typhus, such as epidemic typhus (Rickettsia prowazekii), which have distinct codes.
• Ensure the documentation specifies Rickettsia typhi as the causative agent; "typhus fever" alone is insufficient.
• Consider any associated manifestations or complications, such as pneumonia or neurological involvement, and code them additionally.