C66: Malignant neoplasm of ureter
Codes under C66 (Malignant neoplasm of ureter). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| C66.1 | Malignant neoplasm of right ureter | ✓ |
| C66.1 | Malignant neoplasm of right ureter | ✓ |
| C66.2 | Malignant neoplasm of left ureter | ✓ |
| C66.2 | Malignant neoplasm of left ureter | ✓ |
| C66.9 | Malignant neoplasm of unspecified ureter | ✓ |
| C66.9 | Malignant neoplasm of unspecified ureter | ✓ |
Frequently asked questions
What is ICD-10-CM code C66?
C66 is an ICD-10-CM category covering Malignant neoplasm of ureter. It contains 6 more specific diagnosis codes, 6 of which are billable.
Is C66 a billable code?
No — C66 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example C66.1 — Malignant neoplasm of right ureter). 6 of the 6 codes under C66 are billable.
What codes fall under C66?
C66 includes C66.1, C66.1, C66.2, C66.2, C66.9, plus 1 more. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
Code the diagnosis right
Join providers across the country delivering modern virtual care with CareNiva. Free to start, ready in minutes.
100% Satisfaction Guaranteed — try it risk-free