ICD-10-CM · Chapter 2 · C00-D49
C31 Malignant neoplasm of accessory sinuses
Subcodes
Each subcode links to a detail page with full clinical annotations.
| Code | Description | Billable |
|---|---|---|
| C31..0 | Malignant neoplasm of maxillary sinus | Yes |
| C31..1 | Malignant neoplasm of ethmoidal sinus | Yes |
| C31..2 | Malignant neoplasm of frontal sinus | Yes |
| C31..3 | Malignant neoplasm of sphenoid sinus | Yes |
| C31..8 | Malignant neoplasm of overlapping sites of accessory sinuses | Yes |
| C31..9 | Malignant neoplasm of accessory sinus, unspecified | Yes |
Last reviewed: September 2026