malignant neoplasm of the gallbladder malignant neoplasm of other parts of biliary tract extrahepatic bile duct ampulla of Vater cholelithiasis cholecystitis others (excluding postcholecystectomy syndrome), but including other obstructions of the gallbladder (like strictures) hydrops, perforation, fistula cholesterolosis biliary dyskinesia K83: other diseases of the biliary tract: cholangitis (including ascending cholangitis and primary sclerosing cholangitis) obstruction, perforation, fistula of biliary tract spasm of sphincter of Oddi biliary cyst biliary atresia