ICD-10-CM > C00-D49 > C7A-C7A > C7A > C7A.0 > C7A.01 C7A.01 Malignant carcinoid tumors of the small intestine Non-Billable/Non-Specific Codes C7A.010Malignant carcinoid tumor of the duodenumC7A.011Malignant carcinoid tumor of the jejunumC7A.012Malignant carcinoid tumor of the ileumC7A.019Malignant carcinoid tumor of the small intestine, unspecified portion