C16.3 (Malignant neoplasm of pyloric antrum) compared with D00.2 (Carcinoma in situ of stomach), from the official CMS tabular data. C16.3 and D00.2 name the same anatomical site (antrum) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — carcinoma in situ (antrum)
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. C16.3 and D00.2 name the same anatomical site (antrum) 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.
| C16.3Malignant neoplasm of pyloric antrum | D00.2Carcinoma in situ of stomach | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of pyloric antrum is a billable ICD-10-CM diagnosis code (C16.3). | Carcinoma in situ of stomach is a billable ICD-10-CM diagnosis code (D00.2). |
| Includes | Malignant neoplasm of gastric antrum | Bowen's disease erythroplasia grade III intraepithelial neoplasia Queyrat's erythroplasia |
| Use additional code | code to identify: alcohol abuse and dependence (F10.-) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources