ICD-9 Diagnosis Code 158.9

Mal neo peritoneum NOS

Diagnosis Code 158.9

ICD-9: 158.9
Short Description: Mal neo peritoneum NOS
Long Description: Malignant neoplasm of peritoneum, unspecified
This is the 2014 version of the ICD-9-CM diagnosis code 158.9

Code Classification
  • Neoplasms (140–239)
    • Malignant neoplasm of digestive organs and peritoneum (150-159)
      • 158 Malignant neoplasm of retroperitoneum and peritoneum

Information for Medical Professionals

Convert to ICD-10 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
  • C48.2 - Malignant neoplasm of peritoneum, unspecified

Index of Diseases and Injuries
References found for the code 158.9 in the Index of Diseases and Injuries:

      • cavity
        • peritoneal������������������������������������� 158.9��� 197.6����� -������������ 211.8����� 235.4����� 239.0
      • peritoneum, peritoneal (cavity)������������� 158.9��� 197.6����� -������������ 211.8����� 235.4����� 239.0
        • contiguous sites��������������������������� 158.8��� -������������ -������������ -������������ -������������ -
          • with digestive organs�������������� 159.8��� -������������ -������������ -������������ -������������ -
        • parietal����������������������������������������� 158.8��� 197.6����� -������������ 211.8����� 235.4����� 239.0
        • pelvic������������������������������������������� 158.8��� 197.6����� -������������ 211.8����� 235.4����� 239.0

Information for Patients


Also called: Carcinoma, Malignancy, Neoplasms, Tumor

Cancer begins in your cells, which are the building blocks of your body. Normally, your body forms new cells as you need them, replacing old cells that die. Sometimes this process goes wrong. New cells grow even when you don't need them, and old cells don't die when they should. These extra cells can form a mass called a tumor. Tumors can be benign or malignant. Benign tumors aren't cancer while malignant ones are. Cells from malignant tumors can invade nearby tissues. They can also break away and spread to other parts of the body.

Cancer is not just one disease but many diseases. There are more than 100 different types of cancer. Most cancers are named for where they start. For example, lung cancer starts in the lung, and breast cancer starts in the breast. The spread of cancer from one part of the body to another is called metastasis. Symptoms and treatment depend on the cancer type and how advanced it is. Most treatment plans may include surgery, radiation and/or chemotherapy. Some may involve hormone therapy, biologic therapy, or stem cell transplantation.

NIH: National Cancer Institute

  • Cancer
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  • Cancer prevention: take charge of your lifestyle
  • Genetic testing and your cancer risk
  • Talking with a child about a parent's terminal illness
  • Understanding cancer staging
  • What if cancer comes back?
  • When your cancer treatment stops working

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Peritoneal Disorders

Your peritoneum is the tissue that lines your abdominal wall and covers most of the organs in your abdomen. A liquid, peritoneal fluid, lubricates the surface of this tissue.

Disorders of the peritoneum are not common. They include

  • Peritonitis - an inflammation of the peritoneum
  • Cancer
  • Complications from peritoneal dialysis

Your doctor may use imaging tests or lab tests to analyze the peritoneal fluid to diagnose the problem. Treatment of peritoneal disorders depends on the cause.

  • Abdominal tap
  • Peritoneal fluid analysis
  • Peritoneal fluid culture
  • Peritonitis
  • Peritonitis - secondary
  • Peritonitis - spontaneous
  • Retroperitoneal inflammation

[Read More]
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