C34.9 (Malignant neoplasm of unspecified part of bronchus or lung) compared with D02.2 (Carcinoma in situ of bronchus and lung), from the official CMS tabular data. C34.9 and D02.2 name the same anatomical site (bronchiogenic) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — carcinoma in situ (bronchiogenic)
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. C34.9 and D02.2 name the same anatomical site (bronchiogenic) 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.
| C34.9Malignant neoplasm of unspecified part of bronchus or lung | D02.2Carcinoma in situ of bronchus and lung | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of unspecified part of bronchus or lung is a non-billable ICD-10-CM category code (C34.9). | Carcinoma in situ of bronchus and lung is a non-billable ICD-10-CM category code (D02.2). |
| 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