A23.1
BillableBrucellosis due to Brucella abortus
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is A23.1 an HCC code?
No. A23.1 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
A23.1 is the ICD-10-CM diagnosis code for brucellosis due to brucella abortus. Brucellosis is an infectious disease caused by bacteria from infected animals or contaminated animal products, specifically from cattle in this case. It causes fever, fatigue, and joint pain in humans who come into contact with infected animals or unpasteurized dairy products. A23.1 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).
A23.1 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 (abortus, melitensis, suis, or canis) is documented in the medical record, as each has a different ICD-10-CM code.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A23.1 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 (abortus, melitensis, suis, or canis) is documented in the medical record, as each has a different ICD-10-CM code
- •Document the source of exposure (occupational contact with cattle, consumption of unpasteurized dairy, etc.) to support medical necessity and help identify public health concerns