ICD-10-CM > C00-D49 > C15-C26 > C19 C19 Malignant neoplasm of rectosigmoid junction Billable/Specific Copy Code Copy Description Applicable To Malignant neoplasm of colon with rectumMalignant neoplasm of rectosigmoid (colon) Type 1 Excludes malignant carcinoid tumors of the colon (C7A.02-)