ICD-10 Code K80.42 – Calculus of bile duct with acute cholecystitis without obstruction (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K80.42 – Calculus of bile duct with acute cholecystitis without obstruction
What it is
This code identifies gallstones in the bile duct together with acute inflammation of the gallbladder, without documented obstruction. Use it when the record clearly links both conditions.
Clinical signs
Typical findings include right upper quadrant pain, fever, nausea, and gallbladder tenderness. Imaging or operative notes may show bile duct stones and acute cholecystitis; clinical features vary, so refer to documentation.
When to use this code
Use K80.42 when the provider documents a calculus of the bile duct and acute cholecystitis, and specifically states there is no obstruction. It fits emergency, inpatient, or surgical encounters where both diagnoses are confirmed. If obstruction is documented or unclear, check documentation before coding.
Do not use for
Do not use this code for gallbladder stones alone, or for bile duct stones with obstruction. If acute cholecystitis is absent or not documented, choose a different code.
Coding tip
Code only when both the bile duct calculus and acute cholecystitis are documented together, and verify that “without obstruction” is explicitly supported.