Gallstone ileus

This code represents a rare form of mechanical bowel obstruction caused by a gallstone eroding through the gallbladder wall into the small intestine, typically the ileum. The large gallstone then becomes impacted, leading to symptoms of intestinal obstruction.

Use this code when documentation clearly indicates a diagnosis of gallstone ileus, often confirmed by imaging studies showing a gallstone within the bowel lumen causing obstruction. This diagnosis is typically made in patients presenting with acute abdominal pain, nausea, vomiting, and distension, with a history of cholelithiasis.

• Ensure documentation specifies the obstruction is due to a gallstone, not other foreign bodies or intussusception.
• Do not confuse with simple cholelithiasis or cholecystitis; this code specifically denotes an obstructive complication.
• Code any associated complications, such as peritonitis or sepsis, in addition to the gallstone ileus.