C16.8 (Malignant neoplasm of overlapping sites of stomach) compared with D37.1 (Neoplasm of uncertain behavior of stomach), from the official CMS tabular data. C16.8 and D37.1 name the same anatomical site (stomach) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (stomach)
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. C16.8 and D37.1 name the same anatomical site (stomach) 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.
| C16.8Malignant neoplasm of overlapping sites of stomach | D37.1Neoplasm of uncertain behavior of stomach | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of overlapping sites of stomach is a billable ICD-10-CM diagnosis code (C16.8). | Neoplasm of uncertain behavior of stomach is a billable ICD-10-CM diagnosis code (D37.1). |
| 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