D02.21 (Carcinoma in situ of right bronchus and lung) compared with D49.1 (Neoplasm of unspecified behavior of respiratory system), from the official CMS tabular data. D02.21 and D49.1 name the same anatomical site (bronchus) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — carcinoma in situ (bronchus)
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. D49.1 and D02.21 name the same anatomical site (bronchus) 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.
| D02.21Carcinoma in situ of right bronchus and lung | D49.1Neoplasm of unspecified behavior of respiratory system | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Carcinoma in situ of right bronchus and lung is a billable ICD-10-CM diagnosis code (D02.21). | Neoplasm of unspecified behavior of respiratory system is a billable ICD-10-CM diagnosis code (D49.1). |
| Includes | Bowen's disease erythroplasia grade III intraepithelial neoplasia Queyrat's erythroplasia | 'growth' NOS neoplasm NOS new growth NOS tumor NOS |
| Use additional code | 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