ICD-10-CM > C00-D49 > C15-C26 > C24 C24 Malignant neoplasm of other and unspecified parts of biliary tract Non-Billable/Non-Specific Type 1 Excludes malignant neoplasm of intrahepatic bile duct (C22.1) Codes C24.0Malignant neoplasm of extrahepatic bile ductC24.1Malignant neoplasm of ampulla of VaterC24.8Malignant neoplasm of overlapping sites of biliary tractC24.9Malignant neoplasm of biliary tract, unspecified