C00.1 (Malignant neoplasm of external lower lip) compared with D10.0 (Benign neoplasm of lip), from the official CMS tabular data. C00.1 and D10.0 name the same anatomical site (lip) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — benign neoplasm (lip)
The behavior documented for the site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column of the neoplasm table, and therefore which code, applies.
Source: CMS Table of Neoplasms
Same site, different neoplasm behavior. C00.1 and D10.0 name the same anatomical site (lip) with a different neoplasm behavior.
From the CMS Table of Neoplasms: the behavior documented for that site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column, and therefore which code, applies.
| C00.1Malignant neoplasm of external lower lip | D10.0Benign neoplasm of lip | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of external lower lip is a billable ICD-10-CM diagnosis code (C00.1). | Benign neoplasm of lip is a billable ICD-10-CM diagnosis code (D10.0). |
| Includes | Malignant neoplasm of lower lip NOS Malignant neoplasm of lipstick area of lower lip Malignant neoplasm of vermilion border of lower lip | Benign neoplasm of lip (frenulum) (inner aspect) (mucosa) (vermilion border) |
| 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