C31.3 (Malignant neoplasm of sphenoid sinus) compared with D14.0 (Benign neoplasm of middle ear, nasal cavity and accessory sinuses), from the official CMS tabular data. C31.3 and D14.0 name the same anatomical site (sinus) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — primary malignancy (sinus)
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. D14.0 and C31.3 name the same anatomical site (sinus) 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.
| C31.3Malignant neoplasm of sphenoid sinus | D14.0Benign neoplasm of middle ear, nasal cavity and accessory sinuses | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Malignant neoplasm of sphenoid sinus is a billable ICD-10-CM diagnosis code (C31.3). | Benign neoplasm of middle ear, nasal cavity and accessory sinuses is a billable ICD-10-CM diagnosis code (D14.0). |
| Includes | malignant neoplasm of middle ear | Benign neoplasm of cartilage of nose |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources