Acute cholecystitis

This code represents an acute inflammatory condition of the gallbladder, typically caused by obstruction of the cystic duct by gallstones. Patients often present with sudden onset of right upper quadrant pain, fever, and leukocytosis.

Use this code when documentation clearly indicates an acute inflammation of the gallbladder, often with evidence of gallstones. Supporting documentation includes physician notes detailing symptoms, physical exam findings, and imaging reports (e.g., ultrasound) confirming acute cholecystitis.

• Differentiate from chronic cholecystitis (K81.1) or cholelithiasis without cholecystitis (K80.x).
• If gangrene or perforation is present, sequence the more severe complication first.
• Ensure documentation specifies "acute" to avoid confusion with other cholecystitis types.