2024 ICD-10-CM Diagnosis Code C18.9

by

Malignant neoplasm of colon, unspecified

  • C18.9 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 C18.9 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of C18.9 – other international versions of ICD-10 C18.9 may differ.

Applicable To

  • Malignant neoplasm of large intestine NOS

The following code(s) above C18.9 contain annotation back-references

 that may be applicable to C18.9:

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

Approximate Synonyms

  • Cancer of the colon
  • Cancer of the colon, adenocarcinoma
  • Cancer of the colon, hereditary nonpolyposis
  • Cancer of the colon, stage 1
  • Cancer of the colon, stage 2
  • Cancer of the colon, stage 3
  • Cancer of the colon, stage 4
  • Carcinoma of colon, stage i
  • Carcinoma of colon, stage ii
  • Carcinoma of colon, stage iii
  • Carcinoma of colon, stage iv
  • Colon cancer metastatic to unspecified site
  • Hereditary nonpolyposis colon cancer
  • Malignant tumor of colon
  • Metastasis from malignant tumor of colon
  • Primary adenocarcinoma of colon

Clinical Information

  • A primary or metastatic malignant neoplasm involving the colon.
  • A primary or metastatic malignant neoplasm that affects the colon or rectum. Representative examples include carcinoma, lymphoma, and sarcoma.
  • A primary or metastatic malignant neoplasm that affects the colon. Representative examples include carcinoma, lymphoma, and sarcoma.

ICD-10-CM C18.9 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 C18.9 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 C18.9: