C78.6: Secondary malignant neoplasm of retroperitoneum and peritoneum

You have metastases in your abdomen.

The tissue in the body is made up of cells. With cancer, the cells multiply uncontrollably, which leads to a malignant neoplasm (abnormal growth of tissue) developing. The cancer cells can destroy the healthy tissue and spread throughout the body.

The cancer cells have spread in your body and multiplied at another site. These are called metastases.

The abdominal organs are located in the abdominal cavity. The inside of the abdominal cavity is covered by a thin membrane. This thin membrane also surrounds all the organs in the abdomen. The organs can move against each other thanks to this thin membrane. The metastases in the abdomen may affect the thin membranes of your organs or abdominal cavity. Between the abdominal cavity and back, there is a space inside the body that contains a lot of connective tissue and fat. The kidneys, pancreas, part of the large intestine and aorta for instance are located in this space. The metastases may also affect the area between your abdominal cavity and your back.

Additional indicator

On medical documents, the ICD code is often appended by letters that indicate the diagnostic certainty or the affected side of the body.

  • G: Confirmed diagnosis
  • V: Tentative diagnosis
  • Z: Condition after
  • A: Excluded diagnosis
  • L: Left
  • R: Right
  • B: Both sides

Further information


This information is not intended for self-diagnosis and does not replace professional medical advice from a doctor. If you find an ICD code on a personal medical document, please also note the additional indicator used for diagnostic confidence.
Your doctor will assist you with any health-related questions and explain the ICD diagnosis code to you in a direct consultation if necessary.


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