2020 ICD-10-CM Diagnosis Code C78.6

Secondary malignant neoplasm of retroperitoneum and peritoneum

    2016 2017 2018 2019 2020 Billable/Specific Code
  • C78.6 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Secondary malignant neoplasm of retroperiton and peritoneum
  • The 2020 edition of ICD-10-CM C78.6 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of C78.6 - other international versions of ICD-10 C78.6 may differ.
The following code(s) above C78.6 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 C78.6:
  • C00-D49
    2020 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
  • C78
    ICD-10-CM Diagnosis Code C78

    Secondary malignant neoplasm of respiratory and digestive organs

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • secondary carcinoid tumors of liver (C7B.02)
    • secondary carcinoid tumors of peritoneum (C7B.04)
    Type 2 Excludes
    • lymph node metastases (C77.0)
    Secondary malignant neoplasm of respiratory and digestive organs
Approximate Synonyms
  • Cancer metastatic to omentum
  • Cancer metastatic to peritoneum
  • Cancer metastatic to retroperitoneum
  • Cancer of the ovary with peritoneal metastases
  • Cancer, carcinomatosis of peritoneal cavity
  • Carcinomatosis of peritoneal cavity
  • Ovarian cancer metastatic to peritoneum
  • Pseudomyxoma peritonei
  • Secondary malignant neoplasm of peritoneum
  • Secondary malignant neoplasm of retroperitoneum
  • Secondary malignant neoplasm of the omentum
  • Secondary malignant neoplasm of the peritoneum
ICD-10-CM C78.6 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 374 Digestive malignancy with mcc
  • 375 Digestive malignancy with cc
  • 376 Digestive malignancy without cc/mcc

Convert C78.6 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
Code annotations containing back-references to C78.6:
  • Code First: R18.0
    ICD-10-CM Diagnosis Code R18.0

    Malignant ascites

      2016 2017 2018 2019 2020 Billable/Specific Code
    Code First
    • malignancy, such as:
    • malignant neoplasm of ovary (C56.-)
    • secondary malignant neoplasm of retroperitoneum and peritoneum (C78.6)

Diagnosis Index entries containing back-references to C78.6:
  • Carcinomatosis C80.0
    ICD-10-CM Diagnosis Code C80.0

    Disseminated malignant neoplasm, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Carcinomatosis NOS
    • Generalized cancer, unspecified site (primary) (secondary)
    • Generalized malignancy, unspecified site (primary) (secondary)
    • peritonei C78.6
  • Pseudomyxoma peritonei C78.6

ICD-10-CM Codes Adjacent To C78.6
C78.00 Secondary malignant neoplasm of unspecified lung
C78.01 Secondary malignant neoplasm of right lung
C78.02 Secondary malignant neoplasm of left lung
C78.1 Secondary malignant neoplasm of mediastinum
C78.2 Secondary malignant neoplasm of pleura
C78.3 Secondary malignant neoplasm of other and unspecified respiratory organs
C78.30 Secondary malignant neoplasm of unspecified respiratory organ
C78.39 Secondary malignant neoplasm of other respiratory organs
C78.4 Secondary malignant neoplasm of small intestine
C78.5 Secondary malignant neoplasm of large intestine and rectum
C78.6 Secondary malignant neoplasm of retroperitoneum and peritoneum
C78.7 Secondary malignant neoplasm of liver and intrahepatic bile duct
C78.8 Secondary malignant neoplasm of other and unspecified digestive organs
C78.80 Secondary malignant neoplasm of unspecified digestive organ
C78.89 Secondary malignant neoplasm of other digestive organs
C79 Secondary malignant neoplasm of other and unspecified sites
C79.0 Secondary malignant neoplasm of kidney and renal pelvis
C79.00 Secondary malignant neoplasm of unspecified kidney and renal pelvis
C79.01 Secondary malignant neoplasm of right kidney and renal pelvis
C79.02 Secondary malignant neoplasm of left kidney and renal pelvis
C79.1 Secondary malignant neoplasm of bladder and other and unspecified urinary organs

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