ICD-10-CM > C00-D49 > C15-C26 > C17 C17 Malignant neoplasm of small intestine Non-Billable/Non-Specific Type 1 Excludes malignant carcinoid tumors of the small intestine (C7A.01) Codes C17.0Malignant neoplasm of duodenumC17.1Malignant neoplasm of jejunumC17.2Malignant neoplasm of ileumC17.3Meckel's diverticulum, malignantC17.8Malignant neoplasm of overlapping sites of small intestineC17.9Malignant neoplasm of small intestine, unspecified