Biliary cyst

This code identifies a congenital or acquired sac-like dilation within the biliary tree, which can occur in the intrahepatic or extrahepatic bile ducts. These cysts can lead to bile stasis, inflammation, and an increased risk of cholangitis, pancreatitis, or malignancy.

Assign this code when documentation specifies a diagnosis of a biliary cyst, regardless of its specific type (e.g., choledochal cyst, intrahepatic biliary cyst). This diagnosis is typically confirmed through imaging studies such as ultrasound, CT, or MRI of the abdomen.

• Differentiate from other cystic lesions of the liver or pancreas; ensure the documentation explicitly states "biliary cyst."
• Code any associated complications, such as cholangitis (K83.0x), pancreatitis (K85.x, K86.x), or obstruction (K83.1), as secondary diagnoses.
• Review imaging reports and physician notes for precise anatomical location if further specificity is available, though K83.5 is a general code for any biliary cyst.