A23.0
BillableBrucellosis due to Brucella melitensis
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is A23.0 an HCC code?
No. A23.0 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
A23.0 is the ICD-10-CM diagnosis code for brucellosis due to brucella melitensis. This is a bacterial infection caused by Brucella melitensis, typically acquired from contact with infected animals or contaminated animal products like unpasteurized milk and cheese. It causes fever, joint pain, and fatigue that can become chronic if untreated. A23.0 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering certain zoonotic bacterial diseases (a20-a28).
A23.0 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 Brucella species (melitensis, abortus, suis, or canis) is documented before assigning this code, as each has a different code.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A23.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the specific Brucella species (melitensis, abortus, suis, or canis) is documented before assigning this code, as each has a different code
- •Document the source of infection when possible (occupational exposure, food consumption, animal contact) as this may support medical necessity and help with public health reporting