C31.0 (Malignant neoplasm of maxillary sinus) compared with D02.3 (Carcinoma in situ of other parts of respiratory system), from the official CMS tabular data. C31.0 and D02.3 name the same anatomical site (antrum) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — carcinoma in situ (antrum)
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. C31.0 and D02.3 name the same anatomical site (antrum) 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.
| C31.0Malignant neoplasm of maxillary sinus | D02.3Carcinoma in situ of other parts of respiratory system | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of maxillary sinus is a billable ICD-10-CM diagnosis code (C31.0). | Carcinoma in situ of other parts of respiratory system is a billable ICD-10-CM diagnosis code (D02.3). |
| Includes | malignant neoplasm of middle ear Malignant neoplasm of antrum (Highmore) (maxillary) | 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) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources