2022 ICD-10-CM Code C31

Malignant neoplasm of accessory sinuses

Version 2021

Not Valid for Submission

ICD-10:C31
Short Description:Malignant neoplasm of accessory sinuses
Long Description:Malignant neoplasm of accessory sinuses

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 diagnosis 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 2022 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

Information for Patients


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

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)