D02.4 (Carcinoma in situ of respiratory system, unspecified) compared with D38.5 (Neoplasm of uncertain behavior of other respiratory organs), from the official CMS tabular data. D02.4 and D38.5 name the same anatomical site (respiratory) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (respiratory)
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. D02.4 and D38.5 name the same anatomical site (respiratory) 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.
| D02.4Carcinoma in situ of respiratory system, unspecified | D38.5Neoplasm of uncertain behavior of other respiratory organs | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Carcinoma in situ of respiratory system, unspecified is a billable ICD-10-CM diagnosis code (D02.4). | Neoplasm of uncertain behavior of other respiratory organs is a billable ICD-10-CM diagnosis code (D38.5). |
| Includes | Bowen's disease erythroplasia grade III intraepithelial neoplasia Queyrat's erythroplasia | Neoplasm of uncertain behavior of accessory sinuses Neoplasm of uncertain behavior of cartilage of nose Neoplasm of uncertain behavior of middle ear Neoplasm of uncertain behavior of nasal cavities |
| 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