2024 ICD-10-CM Diagnosis Code C45.1

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Mesothelioma of peritoneum

  • C45.1 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 C45.1 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of C45.1 – other international versions of ICD-10 C45.1 may differ.

Applicable To

  • Mesothelioma of cul-de-sac
  • Mesothelioma of mesentery
  • Mesothelioma of mesocolon
  • Mesothelioma of omentum
  • Mesothelioma of peritoneum (parietal) (pelvic)

Type 1 Excludes

  • other malignant neoplasm of soft tissue of peritoneum (C48.-)

The following code(s) above C45.1 contain annotation back-references

 that may be applicable to C45.1:

Approximate Synonyms

  • Cancer of the mesocolon, mesothelioma
  • Cancer of the peritoneum, mesothelioma
  • Malignant mesothelioma of mesocolon

Clinical Information

  • An aggressive malignant mesothelioma that arises from the peritoneum. Patients usually present with abdominal pain and ascites.

ICD-10-CM C45.1 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 C45.1 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 C45.1: