A79.82
BillableAnaplasmosis [A. phagocytophilum]
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is A79.82 an HCC code?
No. A79.82 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A79.82 is the ICD-10-CM diagnosis code for anaplasmosis [a. phagocytophilum]. Anaplasmosis is a tick-borne bacterial infection caused by Anaplasma phagocytophilum that affects white blood cells and can cause flu-like symptoms including fever, chills, and muscle aches. It is transmitted through the bite of infected ticks and can range from mild to severe illness. A79.82 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering rickettsioses (a75-a79).
A79.82 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Verify the specific Anaplasma species documented in the medical record; A79.82 is specific to A. phagocytophilum, while other species have different codes (A79.81 for A. marginale, A79.83 for A. platys).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A79.82 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the specific Anaplasma species documented in the medical record; A79.82 is specific to A. phagocytophilum, while other species have different codes (A79.81 for A. marginale, A79.83 for A. platys)
- •Document the clinical presentation and any complications; anaplasmosis may present with thrombocytopenia, elevated liver enzymes, or leukopenia, which should be coded separately if documented