CS Site-Specific Factor 25

Schema Discriminator: BileDuctsDistal/BileDuctsPerihilar/CysticDuct

Notes

**Note 1**: For cases coded to primary site code C24.0 (extrahepatic bile ducts), code the subsite in which the tumor arose. This information will be used to determine which CS schemas will be used to assign T, N, M, and AJCC stage group. **Note 2**: According to AJCC, perihilar tumors are defined as those located in the extrahepatic biliary tree proximal to the origin of the cystic duct. These represent 70-80% of extrahepatic bile duct tumors. Distal bile duct tumors are those arising between the junction of the cystic duct and the ampulla of Vater, including those arising in the intrapancreatic portion of the common bile duct. These represent 20-30% of extrahepatic bile duct tumors.
Code Description Schema
010 Perihilar bile duct(s)
Proximal extrahepatic bile duct(s)
Hepatic duct(s)
bile_ducts_perihilar
020 Stated as Klatskin tumor bile_ducts_perihilar
030 Cystic bile duct; cystic duct cystic_duct
040 Distal bile duct
Common bile duct
Common duct, NOS
bile_ducts_distal
050 Diffuse involvement
More than one subsite involved, subsite of origin not stated
bile_ducts_perihilar
060 Subsite of extrahepatic bile ducts not stated
Or subsite stated as middle extrahepatic bile duct
AND treated with combined hepatic and hilar resection
bile_ducts_perihilar
070 Subsite of extrahepatic bile ducts not stated
Or subsite stated as middle extrahepatic bile duct
AND treated with pancreaticoduodenectomy
bile_ducts_distal
100 OBSOLETE DATA RETAINED V0200

C24.0 - originally coded in CSv1 and case diagnosed before 1/1/2010
bile_ducts_perihilar
999 Subsite of extrahepatic bile ducts not stated and not classifiable in codes 050-070 bile_ducts_perihilar