ICD-10 Code K81 – Cholecystitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K81 – Cholecystitis
What it is
K81 identifies cholecystitis, which is inflammation of the gallbladder. Use it when the record documents gallbladder inflammation, whether acute, chronic, or unspecified.
Clinical signs
Common findings include right upper quadrant abdominal pain, tenderness, nausea, vomiting, and fever. Clinical features vary; refer to documentation for the specific type and severity.
When to use this code
Use K81 when the provider diagnoses cholecystitis and does not specify a more detailed code elsewhere in the record. It is appropriate for confirmed gallbladder inflammation documented on imaging, surgery, or clinical assessment. If the note names an acute or chronic form, code to the most specific ICD-10-CM option available.
Do not use for
Do not use K81 for gallstones without inflammation or for nonspecific abdominal pain alone. Check documentation if the chart describes biliary colic, cholelithiasis, or another gallbladder disorder.
Coding tip
Code the highest documented specificity, and verify whether the provider states acute, chronic, or unspecified cholecystitis.