ICD-10-CM > C00-D49 > D3A-D3A > D3A > D3A.0 > D3A.01 D3A.01 Benign carcinoid tumors of the small intestine Non-Billable/Non-Specific Codes D3A.010Benign carcinoid tumor of the duodenumD3A.011Benign carcinoid tumor of the jejunumD3A.012Benign carcinoid tumor of the ileumD3A.019Benign carcinoid tumor of the small intestine, unspecified portion