D41.21
BillableNeoplasm of uncertain behavior of right ureter
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is D41.21 an HCC code?
No. D41.21 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
D41.21 is the ICD-10-CM diagnosis code for neoplasm of uncertain behavior of right ureter. A growth in the right ureter (the tube that carries urine from the kidney) that cannot yet be classified as definitely cancer or definitely benign. D41.21 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes (d37-d48).
D41.21 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.
Ensure laterality is documented as right; do not use this code for left-sided lesions.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for D41.21 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Ensure laterality is documented as right; do not use this code for left-sided lesions
- •This code indicates uncertain behavior - follow-up imaging or pathology results may lead to recoding with a more specific diagnosis