C32.1 (Malignant neoplasm of supraglottis) compared with C78.31 (Secondary malignant neoplasm of larynx), from the official CMS tabular data. C32.1 and C78.31 name the same anatomical site (aryepiglottic fold) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — secondary malignancy (aryepiglottic fold)
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. C32.1 and C78.31 name the same anatomical site (aryepiglottic fold) 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.
| C32.1Malignant neoplasm of supraglottis | C78.31Secondary malignant neoplasm of larynx | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Malignant neoplasm of supraglottis is a billable ICD-10-CM diagnosis code (C32.1). | — |
| Includes | malignant neoplasm of middle ear Malignant neoplasm of aryepiglottic fold or interarytenoid fold, laryngeal aspect Malignant neoplasm of epiglottis (suprahyoid portion) NOS Malignant neoplasm of extrinsic larynx | — |
| Use additional code | code to identify: alcohol abuse and dependence (F10.-) exposure to environmental tobacco smoke (Z77.22) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources