Acute cholecystitis

This code signifies the sudden onset of inflammation of the gallbladder, typically caused by gallstones obstructing the cystic duct. It presents with acute right upper quadrant pain, fever, and leukocytosis.

Assign this code when documentation clearly indicates a diagnosis of acute cholecystitis. Supporting clinical findings often include positive Murphy's sign, elevated white blood cell count, and imaging (ultrasound, CT) demonstrating gallbladder wall thickening, pericholecystic fluid, or gallstones.

• Differentiate from chronic cholecystitis (575.11) or cholelithiasis without cholecystitis (574.xx).
• Always look for documentation of gallstones (cholelithiasis) as the underlying cause and code it secondarily if present.
• Ensure the "acute" nature is explicitly stated or strongly implied by the clinical presentation and diagnostic findings.