ICD-10-CM 2027
ICD-10 code for Gallstone ileus
From the official ICD-10-CM alphabetic index entry “Ileus (bowel) (colon) (inhibitory) (intestine) › gallstone”. Page updated September 29, 2026.
About coding Gallstone ileus
The ICD-10-CM code for Gallstone ileus is K56.3 (Gallstone ileus).
Within K56 (paralytic ileus and intestinal obstruction without hernia), K56.3 is specifically for Gallstone ileus. Related codes cover paralytic ileus (K56.0), intussusception (K56.1), Volvulus (K56.2), other impaction of intestine (K56.4), intestinal adhesions [bands] with obstruction (postinfection) (K56.5), other and unspecified intestinal obstruction (K56.6) and ileus, unspecified (K56.7).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 388 (Gastrointestinal Obstruction with MCC, relative weight 1.4709), DRG 389 (Gastrointestinal Obstruction with CC, relative weight 0.7891) and DRG 390 (Gastrointestinal Obstruction without CC/MCC, relative weight 0.5404), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Gallstone ileus ICD-10 codes
What is the ICD-10 code for Gallstone ileus?
- K56.3 — Gallstone ileus.
Is K56.3 billable?
- Yes. K56.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K56.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K56.3 as a principal diagnosis.
Is K56.3 a CC or MCC?
- K56.3 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.