C18.3 (Malignant neoplasm of hepatic flexure) compared with D01.0 (Carcinoma in situ of colon), from the official CMS tabular data. C18.3 and D01.0 name the same anatomical site (hepatic) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — carcinoma in situ (hepatic)
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. C18.3 and D01.0 name the same anatomical site (hepatic) 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.
| C18.3Malignant neoplasm of hepatic flexure | D01.0Carcinoma in situ of colon | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Malignant neoplasm of hepatic flexure is a billable ICD-10-CM diagnosis code (C18.3). | Carcinoma in situ of colon is a billable ICD-10-CM diagnosis code (D01.0). |
| 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