ICD-10 Code K80.31 – Calculus of bile duct with cholangitis, unspecified, with obstruction (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K80.31 – Calculus of bile duct with cholangitis, unspecified, with obstruction
What it is
This code identifies a bile duct stone causing cholangitis, with obstruction present, when the calculus is not further specified. Use it for documented common bile duct stones associated with biliary infection and blockage.
Clinical signs
Typical findings include right upper quadrant pain, fever, jaundice, and evidence of biliary obstruction. Clinical features vary; refer to documentation for confirmation of cholangitis and the obstructing stone.
When to use this code
Use K80.31 when the record states an unspecified calculus of the bile duct with cholangitis and obstruction. It fits inpatient or outpatient documentation that names choledocholithiasis, cholangitis, and obstructive disease without more specific stone details. Check documentation if the note does not clearly link the stone to the infection and obstruction.
Do not use for
Do not use this code if cholangitis is absent, if there is no documented obstruction, or if the stone location is more specific and separately coded. Do not assign it when documentation only says gallstones without bile duct involvement.
Coding tip
Confirm all three elements—bile duct calculus, cholangitis, and obstruction—before assigning K80.31.