C31

Non-Billable

Malignant neoplasm of accessory sinuses

C31 should not be used for reimbursement purposes as there are multiple sub-diagnoses that fall under this code. Please refer to the sub-diagnoses below.

Related Diagnoses

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