C66 vs C67.6
C66 (Malignant neoplasm of ureter) compared with C67.6 (Malignant neoplasm of ureteric orifice), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. C66 carries an Excludes1 note covering C67.6: “malignant neoplasm of ureteric orifice of bladder (C67.6)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| C66Malignant neoplasm of ureter | C67.6Malignant neoplasm of ureteric orifice | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of ureter is a non-billable ICD-10-CM category code (C66). | Malignant neoplasm of ureteric orifice is a billable ICD-10-CM diagnosis code (C67.6). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources