Malignant neoplasm of duodenum

This code signifies a primary cancerous tumor originating in the duodenum, the first and shortest section of the small intestine. This malignancy involves uncontrolled growth of abnormal cells within the duodenal wall.

Apply this code when documentation confirms a primary malignant neoplasm located specifically within the duodenum. This diagnosis is typically established through biopsy and histopathological examination.

• Differentiate from benign duodenal neoplasms (e.g., adenomas) or secondary/metastatic tumors to the duodenum.
• Ensure the documentation clearly states "primary" or implies origin within the duodenum, not metastasis from another site.
• Consider sequencing with codes for any associated complications, such as obstruction or hemorrhage, if applicable.