ICD-10-CM Code C11.9

Malignant neoplasm of nasopharynx, unspecified

Version 2021 Billable Code Neoplasm Malignant Primary

Valid for Submission

C11.9 is a billable code used to specify a medical diagnosis of malignant neoplasm of nasopharynx, unspecified. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code C11.9 might also be used to specify conditions or terms like adenocarcinoma 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, etc

The following anatomical sites found in the Table of Neoplasms apply to this code given the correct histological behavior: Neoplasm, neoplastic nasopharynx, nasopharyngeal or Neoplasm, neoplastic nasopharynx, nasopharyngeal wall or Neoplasm, neoplastic postnasal space .

Short Description:Malignant neoplasm of nasopharynx, unspecified
Long Description:Malignant neoplasm of nasopharynx, unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code C11.9:

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


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

  • Adenocarcinoma 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
  • Nasopharynx TNM finding
  • Nasopharynx TNM finding
  • Nasopharynx TNM finding
  • Nasopharynx TNM finding
  • Nonkeratinizing carcinoma of the nasopharynx
  • pN1: Unilateral metastasis in lymph node
  • pN2: Bilateral metastasis in lymph node
  • pN3: Metastasis in a lymph node
  • pN3a category
  • pN3a: Metastasis in a lymph node
  • pN3b category
  • pN3b: Metastasis in lymph node
  • Primary adenocarcinoma of nasopharynx
  • Primary adenoid cystic carcinoma of nasopharynx
  • Primary malignant epithelial neoplasm of nasopharynx
  • Primary malignant neoplasm of nasopharynx
  • Primary squamous cell carcinoma of nasopharynx
  • pT1: Tumor confined to the nasopharynx
  • pT2: Tumor extends to the soft tissues
  • pT2a: Tumor extends to the soft tissues of the oropharnyx and/or nasal cavity without parapharyngeal extension
  • pT2b: Tumor extends to the soft tissues of the oropharnyx and/or nasal cavity with parapharyngeal extension
  • pT3: Tumor involves bony structures and/or paranasal sinuses
  • pT4: Tumor with intracranial extension, and/or involvement of cranial nerves, infratemporal fossa, hypopharynx, orbit, or masticator space
  • Squamous cell carcinoma of nasopharynx
  • T1: Aerodigestive tract tumor confined to nasopharynx
  • Tumor of nasal cavity and nasopharynx
  • Undifferentiated carcinoma of nasopharynx
  • Undifferentiated nonkeratinizing carcinoma of nasopharynx

Convert C11.9 to ICD-9

  • 147.9 - Mal neo nasopharynx NOS

Code Classification

  • Neoplasms (C00–D48)
    • Malignant neoplasms of lip, oral cavity and pharynx (C00-C14)
      • Malignant neoplasm of nasopharynx (C11)

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

Table of Neoplasms

The code C11.9 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
»Neoplasm, neoplastic
  »nasopharynx, nasopharyngeal
»Neoplasm, neoplastic
  »nasopharynx, nasopharyngeal
»Neoplasm, neoplastic
  »postnasal space

Information for Patients

Throat Cancer

Also called: Hypopharyngeal cancer, Laryngeal cancer, Laryngopharyngeal cancer, Nasopharyngeal cancer, Oropharyngeal cancer, Pharyngeal 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 substances that attack cancer cells without harming normal cells.

NIH: National Cancer Institute

  • Laryngectomy (Medical Encyclopedia)
  • Swallowing problems (Medical Encyclopedia)
  • Throat or larynx cancer (Medical Encyclopedia)

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