C00 vs C44.0
C00 (Malignant neoplasm of lip) compared with C44.0 (Other and unspecified malignant neoplasm of skin of lip), 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. C00 carries an Excludes1 note covering C44.0: “other and unspecified malignant neoplasm of skin of lip (C44.0-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. C44.0 carries an Excludes1 note covering C00: “malignant neoplasm of lip (C00.-)”
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
| C00Malignant neoplasm of lip | C44.0Other and unspecified malignant neoplasm of skin of lip | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of lip is a non-billable ICD-10-CM category code (C00). | Other and unspecified malignant neoplasm of skin of lip is a non-billable ICD-10-CM category code (C44.0). |
| Includes | — | malignant neoplasm of sebaceous glands malignant neoplasm of sweat glands |
| Use additional code | code to identify: alcohol abuse and dependence (F10.-) history of tobacco dependence (Z87.891) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources