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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Neoplasms 140-239 > Malignant Neoplasm Of Digestive Organs And Peritoneum 150-159 > Malignant Neoplasm Of Gallbladder And Extrahepatic Bile Ducts 156.* > 2007 ICD-9-CM Diagnosis 156.9 Malignant neoplasm of biliary tract part unspecified site This code may be outdated. View the most recent version of ICD-9-CM 156.9 156.9 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 156.* hierarchy 156.9 also known as: Malignant neoplasm involving both intrahepatic and extrahepatic bile ducts