D12.7 (Benign neoplasm of rectosigmoid junction) compared with D37.5 (Neoplasm of uncertain behavior of rectum), from the official CMS tabular data. D12.7 and D37.5 name the same anatomical site (colon) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (colon)
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. D12.7 and D37.5 name the same anatomical site (colon) with a different neoplasm behavior.
From the CMS/CDC 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.
| D12.7Benign neoplasm of rectosigmoid junction | D37.5Neoplasm of uncertain behavior of rectum | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Benign neoplasm of rectosigmoid junction is a billable ICD-10-CM diagnosis code (D12.7). | Neoplasm of uncertain behavior of rectum is a billable ICD-10-CM diagnosis code (D37.5). |
| Includes | — | Neoplasm of uncertain behavior of rectosigmoid junction |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources