ICD-10-CM Code C31

Malignant neoplasm of accessory sinuses

Version 2021 Non-Billable Code

Not Valid for Submission

C31 is a "header" nonspecific and non-billable 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 valid for the year 2021 for the submission of HIPAA-covered transactions.

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

Consider the following ICD-10 codes with a higher level of specificity:

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

Code Classification

  • Neoplasms (C00–D48)
    • Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
      • Malignant neoplasm of accessory sinuses (C31)

Code History

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

Information for Patients


Nasal Cancer

Also called: Cancer of the nasal cavity, Cancer of the paranasal sinus

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

  • Male and over 40 years old
  • Exposed to certain workplace chemicals
  • Infected with HPV
  • A smoker

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

  • After chemotherapy - discharge (Medical Encyclopedia)

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