2022 ICD-10-CM Diagnosis Code C18.9: Malignant Neoplasm Of ...

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2025

  1. ICD-10-CM Codes
    2. ›
  2. C00-D49
    3. ›
  3. C15-C26
    4. ›
  4. C18-
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  5. 2025 ICD-10-CM Diagnosis Code C18.9
2025 ICD-10-CM Diagnosis Code C18.9

Malignant neoplasm of colon, unspecified

    2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Billable/Specific Code
  • C18.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2025 edition of ICD-10-CM C18.9 became effective on October 1, 2024.
  • 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-referencesAnnotation Back-ReferencesIn this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to C18.9:
  • C00-D49 2025 ICD-10-CM Range C00-D49

    NeoplasmsNote
    • Functional activity
    • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
    • Morphology [Histology]
    • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
    • Primary malignant neoplasms overlapping site boundaries
    • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
    • Malignant neoplasm of ectopic tissue
    • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
    Neoplasms

  • C15-C26 2025 ICD-10-CM Range C15-C26

    Malignant neoplasms of digestive organsType 1 Excludes
    • Kaposi's sarcoma of gastrointestinal sites (C46.4)
    Type 2 Excludes
    • gastrointestinal stromal tumors (C49.A-)
    Malignant neoplasms of digestive organs

  • C18 ICD-10-CM Diagnosis Code C18

    Malignant neoplasm of colon

      2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • malignant carcinoid tumors of the colon (C7A.02-)
    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 v42.0):
  • 374 Digestive malignancy with mcc
  • 375 Digestive malignancy with cc
  • 376 Digestive malignancy without cc/mcc

Convert C18.9 to ICD-9-CM

Code 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
  • 2025 (effective 10/1/2024): No change

Diagnosis Index entries containing back-references to C18.9:

  • Adenocarcinoma - see also Neoplasm, malignant, by site
    • in
      • adenomatous
        • polyposis coli C18.9
  • Carcinoma (malignant) - see also Neoplasm, by site, malignant
    • in
      • adenomatous
        • polyposis coli C18.9
  • Polyposis - see also Polyp
    • coli (adenomatous) D12.6ICD-10-CM Diagnosis Code D12.6

      Benign neoplasm of colon, unspecified

        2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Billable/Specific Code
      Applicable To
      • Adenomatosis of colon
      • Benign neoplasm of large intestine NOS
      • Polyposis (hereditary) of colon
      Type 1 Excludes
      • inflammatory polyp of colon (K51.4-)
      • adenocarcinoma in C18.9
      • carcinoma in C18.9

ICD-10-CM Codes Adjacent To C18.9 C18 Malignant neoplasm of colon C18.0 Malignant neoplasm of cecum C18.1 Malignant neoplasm of appendix C18.2 Malignant neoplasm of ascending colon C18.3 Malignant neoplasm of hepatic flexure C18.4 Malignant neoplasm of transverse colon C18.5 Malignant neoplasm of splenic flexure C18.6 Malignant neoplasm of descending colon C18.7 Malignant neoplasm of sigmoid colon C18.8 Malignant neoplasm of overlapping sites of colon C18.9 Malignant neoplasm of colon, unspecified C19 Malignant neoplasm of rectosigmoid junction C20 Malignant neoplasm of rectum C21 Malignant neoplasm of anus and anal canal C21.0 Malignant neoplasm of anus, unspecified C21.1 Malignant neoplasm of anal canal C21.2 Malignant neoplasm of cloacogenic zone C21.8 Malignant neoplasm of overlapping sites of rectum, anus and anal canal C22 Malignant neoplasm of liver and intrahepatic bile ducts C22.0 Liver cell carcinoma C22.1 Intrahepatic bile duct carcinoma

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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