2024 ICD-10-CM Diagnosis Code C11.1

by

Malignant neoplasm of posterior wall of nasopharynx

  • C11.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2024 edition of ICD-10-CM C11.1 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of C11.1 – other international versions of ICD-10 C11.1 may differ.

Applicable To

  • Malignant neoplasm of adenoid
  • Malignant neoplasm of pharyngeal tonsil

The following code(s) above C11.1 contain annotation back-references

 that may be applicable to C11.1:

  • C00-D49  Neoplasms
  • C11  Malignant neoplasm of nasopharynx

Approximate Synonyms

  • Cancer of the nasopharynx, posterior wall
  • Primary malignant neoplasm of posterior wall of nasopharynx
  • Primary squamous cell carcinoma of posterior wall of nasopharynx
  • Primary undifferentiated carcinoma of posterior wall of nasopharynx
  • Squamous cell carcinoma, posterior wall of nasopharynx
  • Undifferentiated carcinoma, posterior wall of nasophar

ICD-10-CM C11.1 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

  • 011 Tracheostomy for face, mouth and neck diagnoses or laryngectomy with mcc
  • 012 Tracheostomy for face, mouth and neck diagnoses or laryngectomy with cc
  • 013 Tracheostomy for face, mouth and neck diagnoses or laryngectomy without cc/mcc
  • 146 Ear, nose, mouth and throat malignancy with mcc
  • 147 Ear, nose, mouth and throat malignancy with cc
  • 148 Ear, nose, mouth and throat malignancy without cc/mcc

Convert C11.1 to ICD-9-CMCode History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change

Code annotations containing back-references to C11.1:

  • Type 2 Excludes: C09