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 E04 Surgical Procedures, Operative D013514 +
  E04.210 Digestive System Surgical Procedures D013505 +
   E04.210.120 Biliary Tract Surgical Procedures D001662 +
     E04.210.120.172 Cholecystectomy D002763 +
     E04.210.120.195 Cholecystostomy D002767 
     E04.210.120.200 Choledochostomy D002768 
     E04.210.120.775 Portoenterostomy, Hepatic D011171 
     E04.210.120.860 Sphincterotomy, Transhepatic D013105 
     E04.210.120.086 Biliopancreatic Diversion D015904 
     E04.210.120.850 Sphincterotomy, Endoscopic D016717