Malignant carcinoid tumor of the jejunum

This code identifies a primary neuroendocrine tumor originating in the jejunum, characterized by its malignant nature and potential for metastasis. These tumors arise from enterochromaffin cells and often secrete vasoactive substances, leading to carcinoid syndrome in some cases.

Apply this code when documentation confirms a malignant carcinoid tumor specifically located in the jejunum. This diagnosis is typically established through biopsy and histopathological examination. Use this code for initial diagnosis, treatment, and follow-up care of this specific jejunal malignancy.

• Ensure the documentation explicitly states "jejunum" and "malignant" for accurate code assignment.
• Do not confuse with benign carcinoid tumors or carcinoid tumors of other small intestine segments.
• Code any associated carcinoid syndrome (e.g., E34.0) separately as a secondary diagnosis.