C03.1 (Malignant neoplasm of lower gum) compared with D10.39 (Benign neoplasm of other parts of mouth), from the official CMS tabular data. C03.1 and D10.39 name the same anatomical site (alveolar) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — benign neoplasm (alveolar)
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. C03.1 and D10.39 name the same anatomical site (alveolar) 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.
| C03.1Malignant neoplasm of lower gum | D10.39Benign neoplasm of other parts of mouth | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of lower gum is a billable ICD-10-CM diagnosis code (C03.1). | Benign neoplasm of other parts of mouth is a billable ICD-10-CM diagnosis code (D10.39). |
| Includes | malignant neoplasm of alveolar (ridge) mucosa malignant neoplasm of gingiva | Benign neoplasm of minor salivary gland NOS |
| 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