Rickettsiosis due to Ehrlichia sennetsu

This code identifies an infection caused by Ehrlichia sennetsu, a gram-negative bacterium transmitted by ticks. It typically presents with fever, headache, myalgia, and lymphadenopathy, often resembling mononucleosis. The condition is a specific form of rickettsiosis, distinct from other ehrlichial infections.

Apply this code when documentation explicitly states a diagnosis of ehrlichiosis due to Ehrlichia sennetsu. Supporting documentation should include laboratory confirmation (e.g., PCR, serology) or a strong clinical suspicion in an endemic area with characteristic symptoms. Differentiate from other ehrlichial species.

• Ensure the documentation specifies Ehrlichia sennetsu and not another Ehrlichia species.
• Do not confuse with other rickettsial infections or unspecified ehrlichiosis.
• Sequence as the primary diagnosis when it is the reason for the encounter.