D01.49 (Carcinoma in situ of other parts of intestine) compared with D37.2 (Neoplasm of uncertain behavior of small intestine), from the official CMS tabular data. D01.49 and D37.2 name the same anatomical site (duodenojejunal junction) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (duodenojejunal junction)
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. D01.49 and D37.2 name the same anatomical site (duodenojejunal junction) 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.
| D01.49Carcinoma in situ of other parts of intestine | D37.2Neoplasm of uncertain behavior of small intestine | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Carcinoma in situ of other parts of intestine is a billable ICD-10-CM diagnosis code (D01.49). | Neoplasm of uncertain behavior of small intestine is a billable ICD-10-CM diagnosis code (D37.2). |
| 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