K35.31: Acute appendicitis with localized peritonitis with perforation or rupture

You have appendicitis.

Appendicitis simply means inflammation of the appendix. The appendix is usually located on the right side attached to the first part of the large intestine. The first part of the large intestine is also known as the cecum.

If the appendix is inflamed, this can cause various symptoms. Severe abdominal pain is common. The abdomen may also be very painful to the touch. You may feel nauseated and may vomit. A high temperature is common.

The wall of your appendix is severely damaged by the inflammation. A hole has developed as a result. Feces can get into the abdominal cavity through the hole. As a result, the membrane around your abdominal organs has become inflamed. 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. If the membrane around the abdominal organs is inflamed, you will usually have very severe abdominal pain. The abdomen may then feel very hard and swollen.

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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