C31 Non-Billable Code

More Specific Diagnosis Codes

This code is not billable as it requires a higher level of specificity. Select a more specific code below.

• C31.0 - Malignant neoplasm of maxillary sinus Billable
• C31.1 - Malignant neoplasm of ethmoidal sinus Billable
• C31.2 - Malignant neoplasm of frontal sinus Billable
• C31.3 - Malignant neoplasm of sphenoid sinus Billable
• C31.8 - Malignant neoplasm of overlapping sites of accessory sinuses Billable
• C31.9 - Malignant neoplasm of accessory sinus, unspecified Billable