K26.3: Duodenal ulcer Acute without haemorrhage or perforation

You have a deep wound in the first segment of your intestines.

The first part of the small intestine is also called the duodenum. This part is directly connected to the stomach and the lower part of the small intestine. The small intestine is lined with mucous membrane.

Your intestinal mucous membrane is severely damaged in one place. As a result, a deep wound has formed in your intestinal mucous membrane. There can be bleeding from the wound.

There are many reasons for a wound in the first segment of the intestines. For example, the mucous membrane may be damaged by too much gastric acid, pathogens or specific drugs.

Because of the wound, you may have pain in your stomach. It is also possible to feel nauseated and your stomach may feel unpleasantly full. You may feel exhausted. Sometimes you can also 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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