2023

  1. ICD-10-CM Codes
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  2. C00-D49
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  3. C45-C49
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  4. C45-
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  5. 2023 ICD-10-CM Diagnosis Code C45.1

2023 ICD-10-CM Diagnosis Code C45.1

Mesothelioma of peritoneum

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • C45.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2023 edition of ICD-10-CM C45.1 became effective on October 1, 2022.
  • 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
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as C45.1. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • other malignant neoplasm of soft tissue of peritoneum (
    ICD-10-CM Diagnosis Code C48
    • C48 Malignant neoplasm of retroperitoneum and per...
      • C48.0 Malignant neoplasm of retroperitoneum
      • C48.1 Malignant neoplasm of specified parts of peri...
      • C48.2 Malignant neoplasm of peritoneum, unspecified...
      • C48.8 Malignant neoplasm of overlapping sites of re...
    C48.-
    )
The following code(s) above C45.1 contain annotation back-references
Annotation Back-References
In 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 C45.1:
  • C00-D49
    2023 ICD-10-CM Range C00-D49

    Neoplasms

    Note
    • 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
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 v40.0):
  • 374 Digestive malignancy with mcc
  • 375 Digestive malignancy with cc
  • 376 Digestive malignancy without cc/mcc

Convert C45.1 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

Diagnosis Index entries containing back-references to C45.1:
  • Mesothelioma (malignant) C45.9
    ICD-10-CM Diagnosis Code C45.9

    Mesothelioma, unspecified

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

ICD-10-CM Codes Adjacent To C45.1
C44.81 Basal cell carcinoma of overlapping sites of skin
C44.82 Squamous cell carcinoma of overlapping sites of skin
C44.89 Other specified malignant neoplasm of overlapping sites of skin
C44.9 Other and unspecified malignant neoplasm of skin, unspecified
C44.90 Unspecified malignant neoplasm of skin, unspecified
C44.91 Basal cell carcinoma of skin, unspecified
C44.92 Squamous cell carcinoma of skin, unspecified
C44.99 Other specified malignant neoplasm of skin, unspecified
C45 Mesothelioma
C45.0 Mesothelioma of pleura
C45.1 Mesothelioma of peritoneum
C45.2 Mesothelioma of pericardium
C45.7 Mesothelioma of other sites
C45.9 Mesothelioma, unspecified
C46 Kaposi's sarcoma
C46.0 Kaposi's sarcoma of skin
C46.1 Kaposi's sarcoma of soft tissue
C46.2 Kaposi's sarcoma of palate
C46.3 Kaposi's sarcoma of lymph nodes
C46.4 Kaposi's sarcoma of gastrointestinal sites
C46.5 Kaposi's sarcoma of lung

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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