2022 ICD-10-CM Diagnosis Code C18.0: Malignant Neoplasm Of ...

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2026

  1. ICD-10-CM Codes
    2. ›
  2. C00-D49
    3. ›
  3. C15-C26
    4. ›
  4. C18-
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  5. 2026 ICD-10-CM Diagnosis Code C18.0
2026 ICD-10-CM Diagnosis Code C18.0

Malignant neoplasm of cecum

    2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 Billable/Specific Code
  • C18.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2026 edition of ICD-10-CM C18.0 became effective on October 1, 2025.
  • This is the American ICD-10-CM version of C18.0 - other international versions of ICD-10 C18.0 may differ.
Applicable To
  • Malignant neoplasm of ileocecal valve
The following code(s) above C18.0 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 C18.0:
  • C00-D49 2026 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 2026 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 2026 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • malignant carcinoid tumors of the colon (C7A.02-)
    Malignant neoplasm of colon
Approximate Synonyms
  • Adenocarcinoma of cecum
  • Cancer ileocecal valve
  • Cancer of the cecum
  • Cancer of the cecum, adenocarcinoma
  • Primary malignant neoplasm of cecum
  • Primary malignant neoplasm of ileocecal valve
Clinical Information
  • A primary or metastatic malignant neoplasm that affects the cecum. Representative examples include carcinoma, lymphoma, and sarcoma.
ICD-10-CM C18.0 is grouped within Diagnostic Related Group(s) (MS-DRG v43.0):
  • 374 Digestive malignancy with mcc
  • 375 Digestive malignancy with cc
  • 376 Digestive malignancy without cc/mcc

Convert C18.0 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
  • 2026 (effective 10/1/2025): No change
Code annotations containing back-references to C18.0:
  • Type 1 Excludes: C17.2 ICD-10-CM Diagnosis Code C17.2

    Malignant neoplasm of ileum

      2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 Billable/Specific Code
    Type 1 Excludes
    • malignant neoplasm of ileocecal valve (C18.0)
ICD-10-CM Codes Adjacent To C18.0 C16.8 Malignant neoplasm of overlapping sites of stomach C16.9 Malignant neoplasm of stomach, unspecified C17 Malignant neoplasm of small intestine C17.0 Malignant neoplasm of duodenum C17.1 Malignant neoplasm of jejunum C17.2 Malignant neoplasm of ileum C17.3 Meckel's diverticulum, malignant C17.8 Malignant neoplasm of overlapping sites of small intestine C17.9 Malignant neoplasm of small intestine, unspecified 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

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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