C34.8 (Malignant neoplasm of overlapping sites of bronchus and lung) compared with D02.1 (Carcinoma in situ of trachea), from the official CMS tabular data. C34.8 and D02.1 name the same anatomical site (tracheobronchial) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — carcinoma in situ (tracheobronchial)
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. C34.8 and D02.1 name the same anatomical site (tracheobronchial) 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.
| C34.8Malignant neoplasm of overlapping sites of bronchus and lung | D02.1Carcinoma in situ of trachea | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Malignant neoplasm of overlapping sites of bronchus and lung is a non-billable ICD-10-CM category code (C34.8). | Carcinoma in situ of trachea is a billable ICD-10-CM diagnosis code (D02.1). |
| Includes | malignant neoplasm of middle ear | Bowen's disease erythroplasia grade III intraepithelial neoplasia Queyrat's erythroplasia |
| Use additional code | code to identify: exposure to environmental tobacco smoke (Z77.22) exposure to tobacco smoke in the perinatal period (P96.81) | code to identify: exposure to environmental tobacco smoke (Z77.22) exposure to tobacco smoke in the perinatal period (P96.81) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources