Babesiosis due to Babesia microti

This code identifies babesiosis specifically caused by the parasite Babesia microti. This is a tick-borne illness characterized by fever, chills, sweats, and fatigue, often presenting with hemolytic anemia. It is a zoonotic infection primarily transmitted by Ixodes scapularis ticks.

Assign this code when the patient's medical record clearly documents a diagnosis of babesiosis and specifies Babesia microti as the causative agent. This typically follows laboratory confirmation through blood smear identification of intraerythrocytic parasites or positive PCR testing for Babesia microti DNA.

• Ensure the documentation explicitly states Babesia microti as the species; do not assume if only "babesiosis" is mentioned.
• If the species is not specified, use B60.09 (Babesiosis, unspecified).
• Code any associated manifestations, such as hemolytic anemia (D59.30-D59.39), as secondary diagnoses.