stomach: Gastrostomy (Percutaneous endoscopic gastrostomy) - Gastrectomy (Billroth I, Billroth II, Roux-en-Y)- Gastric bypass surgery - Gastroenterostomy - Nissen fundoplication - Gastropexy
small bowel: Duodenal switch - Jejunoileal bypass - Ileostomy - Partial ileal bypass surgery
large bowel: Colectomy - Colostomy - Appendicectomy - Hartmann's procedure
rectum: Lower anterior resection - Abdominoperineal resection
gallbladder/bile duct: Endoscopic retrograde cholangiopancreatography - Percutaneous transhepatic cholangiography - Cholecystectomy