A20.0
BillableBubonic plague
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is A20.0 an HCC code?
No. A20.0 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
A20.0 is the ICD-10-CM diagnosis code for bubonic plague. Bubonic plague is a serious bacterial infection spread by infected fleas, characterized by swollen and painful lymph nodes (buboes) typically in the groin, armpits, or neck. It is a rare but potentially life-threatening disease that requires immediate medical treatment with antibiotics. A20.0 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).
A20.0 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.
Bubonic plague (A20.0) is the most common form of plague; ensure you are not confusing it with septicemic plague (A20.7) or pneumonic plague (A20.2), which have different transmission routes and clinical presentations.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A20.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Bubonic plague (A20.0) is the most common form of plague; ensure you are not confusing it with septicemic plague (A20.7) or pneumonic plague (A20.2), which have different transmission routes and clinical presentations
- •This is a reportable disease in most jurisdictions; verify that appropriate public health notifications have been documented in the medical record before finalizing the code