Malignant neuroendocrine tumors

**Excludes2:** - malignant pancreatic islet cell tumors (C25.4) - Merkel cell carcinoma (C4A.-)

**Code also:** - any associated multiple endocrine neoplasia [MEN] syndromes (E31.2-)

**Use additional code:** - code to identify any associated endocrine syndrome, such as: - carcinoid syndrome (E34.00)