A18.3: Tuberculosis of the intestines, the peritoneum and the mesenteric lymph nodes

You have tuberculosis in the intestines, in the membrane around the abdominal organs or in the abdominal lymph nodes.

Tuberculosis is also abbreviated to TB. Tuberculosis is caused by certain bacteria. The bacteria are usually transmitted through coughing and sneezing. The bacteria can remain undetected in the body for a very long time. But they can also cause severe inflammations. The bacteria trigger symptoms when the body’s defense system is weakened. For example, tuberculosis may cause fever, coughing and a feeling of weakness. It is also possible to lose weight and feel very tired. Tuberculosis bacteria are very well adapted to the body and are difficult to treat.

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 lymph nodes are small bean-shaped objects. They are found throughout the body. Lymph nodes filter the tissue fluid. They are part of the defense system.

Your intestines, the membrane around your abdominal organs or your lymph nodes have been inflamed by tuberculosis. As a result, you may have various symptoms. For example, you can have abdominal pain and diarrhea. The abdomen may also be tense and very painful to the touch. It is also possible that you will have no symptoms at all.

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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