Fistula of stomach and duodenum

This code signifies an abnormal connection, or tract, between the stomach and/or the duodenum and another organ or the skin. These fistulas can be internal (e.g., gastrocolic, gastroduodenal) or external (e.g., gastrocutaneous, duodenocutaneous). They often result in leakage of gastric or duodenal contents.

Utilize this code when documentation explicitly states the presence of a fistula involving the stomach and/or duodenum. This includes postoperative fistulas, those secondary to inflammatory conditions like Crohn's disease, or those arising from malignancy or trauma. Supporting documentation should clearly identify the organs involved in the fistulous tract.

• Specify the exact type of fistula (e.g., gastrocolic, gastroduodenal) if documented, as more specific codes may exist.
• Always code the underlying cause of the fistula, if known and documented, as a primary or secondary diagnosis.
• Distinguish from simple perforations or ulcers without an established fistulous tract.