K55.21
BillableAngiodysplasia of colon with hemorrhage
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is K55.21 an HCC code?
No. K55.21 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
K55.21 is the ICD-10-CM diagnosis code for angiodysplasia of colon with hemorrhage. Abnormal blood vessels in the colon that are actively bleeding or have recently bled. K55.21 sits in the ICD-10-CM chapter for diseases of the digestive system (k00-k95), within the section covering other diseases of intestines (k55-k64).
K55.21 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.
Document the severity and amount of bleeding to support medical necessity for interventions.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for K55.21 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document the severity and amount of bleeding to support medical necessity for interventions
- •This code indicates active hemorrhage; pair with appropriate bleeding codes if needed