ICD-10 Code K82.1 – Hydrops of gallbladder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K82.1 – Hydrops of gallbladder
What it is
K82.1 identifies hydropic distention of the gallbladder, usually from prolonged cystic duct obstruction. It means the gallbladder is enlarged and filled with clear mucus or fluid rather than bile.
Clinical signs
Clinical features vary; refer to documentation. Commonly, you may see right upper quadrant pain, gallbladder enlargement on imaging, or findings consistent with obstruction without signs of acute infection.
When to use this code
Use K82.1 when the provider documents hydrops of the gallbladder, mucocele of the gallbladder, or similar wording. Code it when imaging or operative notes describe a distended gallbladder due to obstruction, and the record supports that diagnosis. Check documentation if the note instead describes acute cholecystitis or another gallbladder disorder.
Do not use for
Do not use this code for uncomplicated gallstones, acute cholecystitis, or gallbladder rupture unless hydrops is specifically documented. If the diagnosis is unclear, check documentation.
Coding tip
Capture the exact provider wording; hydrops, mucocele, and simple distention are not always interchangeable.