Choledochal cyst

This code identifies a congenital anomaly characterized by a cystic dilation of the common bile duct. This malformation can lead to bile stasis, recurrent cholangitis, pancreatitis, and an increased risk of cholangiocarcinoma.

Assign this code when documentation specifies a choledochal cyst. This diagnosis is typically made through imaging studies such as ultrasound, CT, or MRI. Supporting documentation should clearly indicate the presence of this specific congenital biliary tract anomaly.

• Differentiate from other biliary tract obstructions or dilations that are not congenital cysts.
• Consider additional codes for any associated complications, such as cholangitis (K83.0-) or pancreatitis (K85.-).
• Ensure the documentation specifies "choledochal cyst" rather than a general bile duct dilation.