C31 - Malignant neoplasm of accessory sinuses

Version 2023
ICD-10:C31
Short Description:Malignant neoplasm of accessory sinuses
Long Description:Malignant neoplasm of accessory sinuses
Status: Not Valid for Submission
Version:ICD-10-CM 2023
Code Classification:
  • Neoplasms (C00–D48)
    • Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
      • Malignant neoplasm of accessory sinuses (C31)

C31 is a non-specific and non-billable ICD-10 code code, consider using a code with a higher level of specificity for a diagnosis of malignant neoplasm of accessory sinuses. The code is not specific and is NOT valid for the year 2023 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding for Malignant neoplasm of accessory sinuses

Non-specific codes like C31 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for malignant neoplasm of accessory sinuses:

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

Patient Education


Nasal Cancer

Your paranasal sinuses are small hollow spaces around the nose. They are lined with cells that make mucus, which keeps your nose from drying out. The nasal cavity is the passageway just behind your nose. Air passes through it on the way to your throat as you breathe.

Cancer of the nasal cavity and paranasal sinuses is rare. You are at greater risk if you are:

There may be no symptoms at first, and later symptoms can be like those of infections. Doctors diagnose nasal cancer with imaging tests, lighted tube-like instruments that look inside the nose, and biopsies. Treatment options include surgery, radiation, and chemotherapy.

NIH: National Cancer Institute


[Learn More in MedlinePlus]

Code History