All
 E04 Surgical Procedures, Operative D013514 +
 E04.210 Digestive System Surgical Procedures D013505 +
 E04.210.240 Endoscopy, Digestive System D016145 +
 E04.210.240.160 Cholangiopancreatography, Endoscopic Retrograde D002760 
 E04.210.240.260 Esophagoscopy D004945 
 E04.210.240.250 Endoscopy, Gastrointestinal D016099 +