C76.1 (Malignant neoplasm of thorax) compared with D04.5 (Carcinoma in situ of skin of trunk), from the official CMS tabular data. C76.1 and D04.5 name the same anatomical site (infraclavicular) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — carcinoma in situ (infraclavicular)
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. C76.1 and D04.5 name the same anatomical site (infraclavicular) 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.
| C76.1Malignant neoplasm of thorax | D04.5Carcinoma in situ of skin of trunk | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Malignant neoplasm of thorax is a billable ICD-10-CM diagnosis code (C76.1). | Carcinoma in situ of skin of trunk is a billable ICD-10-CM diagnosis code (D04.5). |
| Includes | Intrathoracic malignant neoplasm NOS Malignant neoplasm of axilla NOS Thoracic malignant neoplasm NOS | 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