C11.3 (Malignant neoplasm of anterior wall of nasopharynx) compared with D00.08 (Carcinoma in situ of pharynx), from the official CMS tabular data. C11.3 and D00.08 name the same anatomical site (choana) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — carcinoma in situ (choana)
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. C11.3 and D00.08 name the same anatomical site (choana) 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.
| C11.3Malignant neoplasm of anterior wall of nasopharynx | D00.08Carcinoma in situ of pharynx | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of anterior wall of nasopharynx is a billable ICD-10-CM diagnosis code (C11.3). | Carcinoma in situ of pharynx is a billable ICD-10-CM diagnosis code (D00.08). |
| Includes | Malignant neoplasm of floor of nasopharynx Malignant neoplasm of nasopharyngeal (anterior) (posterior) surface of soft palate Malignant neoplasm of posterior margin of nasal choana Malignant neoplasm of posterior margin of nasal septum | 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