2026 ICD-10-CM Diagnosis Code C11Malignant neoplasm of nasopharynx

ICD-10-CM Codes›C00–D49›C00-C14›C11

ICD-10-CM C11
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C11 is a non-billable ICD-10-CM category code for malignant neoplasm of nasopharynx, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C11.0, C11.1, C11.2, and C11.3.

Code Identity

ICD-10-CM Code
C11
Billable Status
No — Non-Billable Category
Code Describes
Malignant neoplasm of nasopharynx
Short Description
Malignant neoplasm of nasopharynx
Same as the full description in the CMS dataset.
Chapter
C00-C14
Malignant neoplasms of lip, oral cavity and pharynx

Code Classification

ChapterC00–D49Neoplasms
SectionC00-C14Malignant neoplasms of lip, oral cavity and pharynx
CategoryC11Malignant neoplasm of nasopharynx
This CodeC11Malignant neoplasm of nasopharynx

Specific Coding for Malignant neoplasm of nasopharynxOverview

Non-specific codes like C11 require more characters. Use one of these billable codes instead:

  • Use C11.0 for Malignant neoplasm of superior wall of nasopharynx

  • Use C11.1 for Malignant neoplasm of posterior wall of nasopharynx

  • Use C11.2 for Malignant neoplasm of lateral wall of nasopharynx

  • Use C11.3 for Malignant neoplasm of anterior wall of nasopharynx

  • Use C11.8 for Malignant neoplasm of overlapping sites of nasopharynx

  • Use C11.9 for Malignant neoplasm of nasopharynx, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Use Additional Code

  • code to identify:
  • exposure to environmental tobacco smoke Z77.22
  • exposure to tobacco smoke in the perinatal period P96.81
  • history of tobacco dependence Z87.891
  • occupational exposure to environmental tobacco smoke Z57.31
  • tobacco dependence F17
  • tobacco use Z72.0

Patient EducationClinical

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C11Overview

Is C11 (Malignant neoplasm of nasopharynx) a billable code?

No. This is a category header that groups the codes for malignant neoplasm of nasopharynx, and headers cannot be submitted on claims. Claims for malignant neoplasm of nasopharynx need a more specific code from this category, such as C11.0, C11.1, and C11.2.