A23.3
BillableBrucellosis due to Brucella canis
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is A23.3 an HCC code?
No. A23.3 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
A23.3 is the ICD-10-CM diagnosis code for brucellosis due to brucella canis. This is a bacterial infection caused by Brucella canis, a pathogen typically transmitted from infected dogs to humans through direct contact with infected animal tissues or bodily fluids. The infection can cause fever, fatigue, and joint pain in affected individuals. A23.3 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).
A23.3 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 documentation specifies Brucella canis as the causative organism; other Brucella species (melitensis, abortus, suis) have different codes.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A23.3 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify documentation specifies Brucella canis as the causative organism; other Brucella species (melitensis, abortus, suis) have different codes
- •Investigate the source of exposure (occupational contact with dogs, veterinary work, or animal handling) as this may support medical necessity and help identify additional codes for complications