2007 ICD-9-CM Procedure 51.81 Dilation of sphincter of oddi 51.81 is a specific code that can be used to specify a procedure 51.81 contains 3 index entries View the full Volume 3 51.* hierarchy 51.81 also known as: Dilation of ampulla of Vater 51.81 excludes: that by endoscopic approach (51.84) Index entries containing 51.81: Dilation ampulla of Vater 51.81 endoscopic 51.84 biliary duct sphincter of Oddi 51.81 endoscopic 51.84 sphincter of Oddi 51.81 endoscopic 51.84