ICD-10 Code K80.18 – Calculus of gallbladder with other cholecystitis without obstruction (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K80.18 – Calculus of gallbladder with other cholecystitis without obstruction
What it is
K80.18 identifies gallstones in the gallbladder with cholecystitis, but without biliary obstruction. Use it when the record shows inflammation of the gallbladder associated with stones and no blockage is documented.
Clinical signs
Typical findings include right upper quadrant pain, tenderness, nausea, and signs of gallbladder inflammation. Clinical features vary; refer to documentation for whether the cholecystitis is acute, chronic, or otherwise specified.
When to use this code
Use this code when the provider documents gallstones plus cholecystitis and specifically states there is no obstruction. It fits operative notes, imaging reports, or discharge summaries that link the stone disease to gallbladder inflammation. If obstruction is mentioned, check documentation before coding.
Do not use for
Do not use K80.18 if the record shows gallstones without cholecystitis, or if obstruction of the bile duct is documented. Check documentation when the note is unclear about the presence or absence of obstruction.
Coding tip
Confirm both “calculus” and “other cholecystitis” are documented, then verify that “without obstruction” is explicitly stated.