ICD-10-CM Code C31.2

Malignant neoplasm of frontal sinus

Version 2020 Billable Code Neoplasm Malignant Primary

Valid for Submission

C31.2 is a billable code used to specify a medical diagnosis of malignant neoplasm of frontal sinus. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code C31.2 might also be used to specify conditions or terms like malignant melanoma of accessory sinus, malignant melanoma of frontal sinus, malignant tumor of frontal sinus, primary adenocarcinoma of accessory sinus, primary adenocarcinoma of frontal sinus, primary carcinoma of frontal sinus, etc

The following anatomical sites found in the Table of Neoplasms apply to this code given the correct histological behavior: frontal sinus or sinus (accessory) frontal .

Short Description:Malignant neoplasm of frontal sinus
Long Description:Malignant neoplasm of frontal sinus


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Malignant melanoma of accessory sinus
  • Malignant melanoma of frontal sinus
  • Malignant tumor of frontal sinus
  • Primary adenocarcinoma of accessory sinus
  • Primary adenocarcinoma of frontal sinus
  • Primary carcinoma of frontal sinus
  • Primary malignant neoplasm of frontal sinus
  • Primary squamous cell carcinoma of accessory sinus
  • Primary squamous cell carcinoma of frontal sinus

Convert C31.2 to ICD-9

  • 160.4 - Malig neo frontal sinus

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

Table of Neoplasms

The code C31.2 is included in the table of neoplasms by anatomical site. For each site there are six possible code numbers according to whether the neoplasm in question is malignant, benign, in situ, of uncertain behavior, or of unspecified nature. The description of the neoplasm will often indicate which of the six columns is appropriate.

Where such descriptors are not present, the remainder of the Index should be consulted where guidance is given to the appropriate column for each morphological (histological) variety listed. However, the guidance in the Index can be overridden if one of the descriptors mentioned above is present.

Neoplasm, neoplastic Malignant
CaInSitu Benign Uncertain
»sinus (accessory)

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

  • 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

[Learn More]