D01.1 (Carcinoma in situ of rectosigmoid junction) compared with D12.7 (Benign neoplasm of rectosigmoid junction), from the official CMS tabular data. D01.1 and D12.7 name the same anatomical site (colon) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — benign neoplasm (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. D01.1 and D12.7 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.
| D01.1Carcinoma in situ of rectosigmoid junction | D12.7Benign neoplasm of rectosigmoid junction | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Carcinoma in situ of rectosigmoid junction is a billable ICD-10-CM diagnosis code (D01.1). | Benign neoplasm of rectosigmoid junction is a billable ICD-10-CM diagnosis code (D12.7). |
| Includes | Bowen's disease erythroplasia grade III intraepithelial neoplasia Queyrat's erythroplasia | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources