C76 vs C80.1
C76 (Malignant neoplasm of other and ill-defined sites) compared with C80.1 (Malignant (primary) neoplasm, unspecified), 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. C76 carries an Excludes1 note covering C80.1: “malignant neoplasm of unspecified site NOS (C80.1)”
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
| C76Malignant neoplasm of other and ill-defined sites | C80.1Malignant (primary) neoplasm, unspecified | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of other and ill-defined sites is a non-billable ICD-10-CM category code (C76). | Malignant (primary) neoplasm, unspecified is a billable ICD-10-CM diagnosis code (C80.1). |
| Includes | — | Cancer NOS Cancer unspecified site (primary) Carcinoma unspecified site (primary) Malignancy unspecified site (primary) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources