2024 ICD-10-CM Diagnosis Code C31.9

Malignant neoplasm of accessory sinus, unspecified

ICD-10-CM Code:
C31.9
ICD-10 Code for:
Malignant neoplasm of accessory sinus, unspecified
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Chronic
Code Navigator:

Code Classification

  • Neoplasms
    (C00–D49)
    • Malignant neoplasms of respiratory and intrathoracic organs
      (C30-C39)
      • Malignant neoplasm of accessory sinuses
        (C31)

C31.9 is a billable diagnosis code used to specify a medical diagnosis of malignant neoplasm of accessory sinus, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

The following anatomical sites found in the Table of Neoplasms reference this diagnosis code given the correct histological behavior: Neoplasm, neoplastic sinus (accessory) or Neoplasm, neoplastic sinus (accessory) nasal, paranasal NEC .

Unspecified diagnosis codes like C31.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

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

  • Adenocarcinoma of accessory sinus
  • Carcinoma of nasal cavity
  • Malignant melanoma of accessory sinus
  • Malignant neoplasm of nasal cavities, middle ear and accessory sinuses
  • Malignant tumor of nasal sinuses
  • Primary adenocarcinoma of accessory sinus
  • Primary carcinoma of accessory sinus
  • Primary malignant neoplasm of accessory sinus
  • Primary malignant neoplasm of nasal cavity
  • Primary squamous cell carcinoma of accessory sinus
  • Primary squamous cell carcinoma of accessory sinus
  • Primary squamous cell carcinoma of nasal cavity
  • Primary squamous cell carcinoma of nasal cavity and paranasal sinus
  • Primary undifferentiated carcinoma of nasal sinus
  • Squamous cell carcinoma of nose
  • Undifferentiated carcinoma of nasal sinus

Clinical Classification

Convert C31.9 to ICD-9-CM

  • ICD-9-CM Code: 160.9 - Mal neo access sinus NOS

Table of Neoplasms

This code is referenced 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
Primary
Malignant
Secondary
CaInSitu Benign Uncertain
Behavior
Unspecified
Behavior
»Neoplasm, neoplastic
  »sinus (accessory)
C31.9C78.39D02.3D14.0D38.5D49.1
»Neoplasm, neoplastic
  »sinus (accessory)
    »nasal, paranasal NEC
C31.9C78.39D02.3D14.0D38.5D49.1

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:

  • 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 in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • 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. This was the first year ICD-10-CM was implemented into the HIPAA code set.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.