ICD-10 Code K56.3 – Gallstone ileus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K56.3 – Gallstone ileus
What it is
K56.3 identifies gallstone ileus, a bowel obstruction caused by a gallstone entering the intestinal tract, usually through an abnormal connection from the gallbladder. Use it when the diagnosis is documented as gallstone-related obstruction.
Clinical signs
Typical findings include symptoms of intestinal obstruction such as abdominal pain, vomiting, distention, and constipation or failure to pass stool. Clinical features vary; refer to documentation and imaging reports confirming gallstone ileus.
When to use this code
Use K56.3 when the provider documents gallstone ileus as the cause of the obstruction, whether confirmed during surgery, imaging, or specialist assessment. It is appropriate when the record clearly links the obstructive episode to a gallstone. If the note only says bowel obstruction without this cause, check documentation.
Do not use for
Do not use this code for gallstones without obstruction or for nonspecific intestinal obstruction with no documented gallstone cause. Check documentation if the obstruction is due to another etiology.
Coding tip
Assign K56.3 only when the record explicitly states gallstone ileus or clearly documents gallstone-caused obstruction.