A79.82 ICD-10-CM Code: Anaplasmosis [A. phagocytophilum]
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Rickettsioses (A75-A79)
A79.82
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceAnaplasmosis [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.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Transfusion transmitted A. phagocytophilum
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A79.82 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A79.82 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A79.82 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A79.82 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A79.82 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A79.82 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
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