2024 ICD-10-CM Diagnosis Code C18.1

by

Malignant neoplasm of appendix

  • C18.1 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 C18.1 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of C18.1 – other international versions of ICD-10 C18.1 may differ.

The following code(s) above C18.1 contain annotation back-references

 that may be applicable to C18.1:

  • C00-D49  Neoplasms
  • C15-C26  Malignant neoplasms of digestive organs
  • C18  Malignant neoplasm of colon

Approximate Synonyms

  • Adenocarcinoma of appendix
  • Cancer of the appendix
  • Cancer of the appendix, adenocarcinoma
  • Primary malignant neoplasm of appendix

Clinical Information

  • A malignant neoplasm arising from the wall of the appendix. Representative examples include carcinomas and lymphomas.
  • A primary or metastatic malignant neoplasm that affects the appendix. Representative examples include carcinoma and lymphoma.

ICD-10-CM C18.1 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

  • 374 Digestive malignancy with mcc
  • 375 Digestive malignancy with cc
  • 376 Digestive malignancy without cc/mcc

Convert C18.1 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

Diagnosis Index entries containing back-references to C18.1: