C66.1 Malignant neoplasm of right ureter

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from C66 Malignant neoplasm of ureter

Excludes1 (never code together)

• malignant neoplasm of ureteric orifice of bladder (C67.6)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 22 — Bladder, Colorectal, and Other Cancers
• CMS-HCC V22: HCC 11 — Colorectal, Bladder, and Other Cancers
• RxHCC V08: HCC 22 — Prostate, Breast, Bladder, and Other Cancers and Tumors
• ESRD V24: HCC 11

MS-DRG index

Defines the logic of DRG(s) 656-658 in MDC 11.

Approximate ICD-9-CM (GEMs)

• 189.2 Malignant neoplasm of ureter (approximate)

Nearby codes

• C66 Malignant neoplasm of ureter
• C66.1 Malignant neoplasm of right ureter (this code)
• C66.2 Malignant neoplasm of left ureter
• C66.9 Malignant neoplasm of unspecified ureter