2024 ICD-10-CM Diagnosis Code C11.9

Malignant neoplasm of nasopharynx, unspecified

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

Code Classification

  • Neoplasms
    • Malignant neoplasms of lip, oral cavity and pharynx
      • Malignant neoplasm of nasopharynx

C11.9 is a billable diagnosis code used to specify a medical diagnosis of malignant neoplasm of nasopharynx, 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 nasopharynx, nasopharyngeal or Neoplasm, neoplastic nasopharynx, nasopharyngeal wall or Neoplasm, neoplastic postnasal space .

Unspecified diagnosis codes like C11.9 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 nasopharynx
  • Adenoid squamous cell carcinoma of nasopharynx
  • Basaloid squamous cell carcinoma of nasopharynx
  • Keratinizing squamous cell carcinoma of nasopharynx
  • Malignant neoplasm of nasopharyngeal wall
  • Malignant tumor of nasal cavity and nasopharynx
  • Malignant tumor of nasopharynx
  • Nasopharyngeal carcinoma
  • Nonkeratinizing carcinoma of the nasopharynx
  • Papillary squamous cell carcinoma of nasopharynx
  • Primary acantholytic squamous cell carcinoma
  • Primary adenocarcinoma of nasopharynx
  • Primary adenoid cystic carcinoma of nasopharynx
  • Primary adenoid squamous cell carcinoma of nasopharynx
  • Primary basaloid squamous cell carcinoma of nasopharynx
  • Primary keratinizing squamous cell carcinoma of nasopharynx
  • Primary lymphoepithelial carcinoma of nasopharynx
  • Primary malignant epithelial neoplasm of nasopharynx
  • Primary malignant neoplasm of nasopharynx
  • Primary mucoepidermoid carcinoma of nasopharynx
  • Primary nonkeratinizing carcinoma of the nasopharynx
  • Primary papillary adenocarcinoma of nasopharynx
  • Primary papillary squamous cell carcinoma of nasopharynx
  • Primary salivary gland type neoplasm of nasopharynx
  • Primary squamous cell carcinoma of nasopharynx
  • Primary undifferentiated carcinoma of nasopharynx
  • Primary undifferentiated nonkeratinizing carcinoma of nasopharynx
  • Squamous cell carcinoma of nasopharynx
  • Tumor of nasal cavity and nasopharynx
  • Undifferentiated carcinoma of nasopharynx
  • Undifferentiated nonkeratinizing carcinoma of nasopharynx

Clinical Classification

Clinical Information

  • Nasopharyngeal Carcinoma

    a carcinoma that originates in the epithelium of the nasopharynx and includes four subtypes: keratinizing squamous cell, non-keratinizing, basaloid squamous cell, and papillary adenocarcinoma. it is most prevalent in southeast asian populations and is associated with epstein-barr virus infections. somatic mutations associated with this cancer have been identified in npcr, bap1, ubap1, erbb2, erbb3, mll2, pik3ca, kras, nras, and arid1a genes.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Malignant neoplasm of nasopharyngeal wall NOS

Convert C11.9 to ICD-9-CM

  • ICD-9-CM Code: 147.9 - Mal neo nasopharynx 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
CaInSitu Benign Uncertain
»Neoplasm, neoplastic
  »nasopharynx, nasopharyngeal
»Neoplasm, neoplastic
  »nasopharynx, nasopharyngeal
»Neoplasm, neoplastic
  »postnasal space

Patient Education

Throat Cancer

Throat cancer is a type of head and neck cancer. Throat cancer has different names, depending on which part of the throat is affected. The different parts of your throat are called the oropharynx, the hypopharynx, the nasopharynx, and the larynx, or voice box.

The main risk factors for throat cancer are using tobacco heavy drinking. Certain types of throat cancer also have other risk factors. For example, having HPV is a risk factor for oropharyngeal cancer.

Symptoms of throat cancer may include:

  • A sore throat that does not go away
  • A lump in the neck
  • Pain or ringing in the ears
  • Trouble swallowing
  • Ear pain

To diagnose throat cancers, doctors may do a physical exam and history, imaging tests, and a biopsy. You may also need other tests, depending on the type of cancer. Treatments include surgery, radiation therapy, and chemotherapy. Treatment for some types of throat cancer may also include targeted therapy. Targeted therapy uses drugs or other substances that attack specific cancer cells with less harm to normal cells.

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.


[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.