ICD-10 Code K80.35 – Calculus of bile duct with chronic cholangitis with obstruction (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K80.35 – Calculus of bile duct with chronic cholangitis with obstruction
What it is
K80.35 identifies a bile duct stone with chronic inflammation of the bile ducts and blockage of bile flow. Use it when the documentation clearly links the calculus, chronic cholangitis, and obstruction.
Clinical signs
Typical findings include biliary obstruction with evidence of chronic cholangitis, such as recurrent upper abdominal pain, jaundice, or a history of repeated biliary infection. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents a calculus in the bile duct plus chronic cholangitis and obstruction in the same encounter. It fits records that specify both the stone and the obstructive inflammatory process, not vague biliary disease. Check documentation if the note does not clearly confirm chronic cholangitis.
Do not use for
Do not use it for gallbladder stones without bile duct involvement, or for acute cholangitis alone. If obstruction or chronicity is not documented, choose a more specific or different code.
Coding tip
Code only when the provider states all three elements: calculus, chronic cholangitis, and obstruction.