ICD-10 Code A79.82 – Anaplasmosis [A. phagocytophilum] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A79.82 – Anaplasmosis [A. phagocytophilum]
What it is
A79.82 identifies anaplasmosis caused by Anaplasma phagocytophilum, a tick-borne bacterial infection. Use it when the record documents this specific organism or a clearly confirmed diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include fever, headache, malaise, myalgia, and laboratory evidence of systemic infection, but you should code only what is documented.
When to use this code
Use A79.82 when the provider documents anaplasmosis due to A. phagocytophilum, whether based on clinical assessment, testing, or both. It also fits follow-up encounters if the diagnosis remains relevant to the visit. If the organism is not specified, check documentation before assigning this code.
Do not use for
Do not use this code for nonspecific tick-borne illness or when another ehrlichial or rickettsial infection is documented instead. If the chart only says “suspected” or “rule out,” check documentation.
Coding tip
Confirm the organism name in the record; A79.82 is for A. phagocytophilum, not for unspecified anaplasmosis.