C03.0 (Malignant neoplasm of upper gum) compared with D37.09 (Neoplasm of uncertain behavior of other specified sites of the oral cavity), from the official CMS tabular data. C03.0 and D37.09 name the same anatomical site (alveolar) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (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. C03.0 and D37.09 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.
| C03.0Malignant neoplasm of upper gum | D37.09Neoplasm of uncertain behavior of other specified sites of the oral cavity | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Malignant neoplasm of upper gum is a billable ICD-10-CM diagnosis code (C03.0). | Neoplasm of uncertain behavior of other specified sites of the oral cavity is a billable ICD-10-CM diagnosis code (D37.09). |
| Includes | malignant neoplasm of alveolar (ridge) mucosa malignant neoplasm of gingiva | — |
| 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