Brill's disease

This code represents a recrudescence of latent typhus, specifically epidemic louse-borne typhus, in individuals previously infected. It is characterized by a milder clinical course than the primary infection, often occurring years after initial exposure to Rickettsia prowazekii.

Use this code when documentation clearly indicates a diagnosis of Brill-Zinsser disease, which is the reactivation of epidemic typhus. This diagnosis is typically supported by a history of prior epidemic typhus infection and current clinical symptoms consistent with a milder, recurrent form of the disease.

• Differentiate from acute epidemic typhus (080.0) which represents the primary infection.
• Ensure documentation specifies "Brill's disease" or "Brill-Zinsser disease" rather than just "typhus" to avoid miscoding.
• Consider any associated manifestations or complications of Brill's disease for additional coding.