C78.32 (Secondary malignant neoplasm of pharynx) compared with D37.05 (Neoplasm of uncertain behavior of pharynx), from the official CMS tabular data. C78.32 and D37.05 name the same anatomical site (pharynx) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (pharynx)
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. C78.32 and D37.05 name the same anatomical site (pharynx) 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.
| C78.32Secondary malignant neoplasm of pharynx | D37.05Neoplasm of uncertain behavior of pharynx | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | — | Neoplasm of uncertain behavior of pharynx is a billable ICD-10-CM diagnosis code (D37.05). |
| Includes | — | Neoplasm of uncertain behavior of aryepiglottic fold of pharynx NOS Neoplasm of uncertain behavior of hypopharyngeal aspect of aryepiglottic fold of pharynx Neoplasm of uncertain behavior of marginal zone of aryepiglottic fold of pharynx |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources