ICD-10-CM 2027
ICD-10 code for duodenum constriction
From the official ICD-10-CM alphabetic index entry “Constriction › duodenum”. Page updated September 29, 2026.
About coding duodenum constriction
The ICD-10-CM code for duodenum constriction is K31.5 (Obstruction of duodenum).
Within K31 (other diseases of stomach and duodenum), K31.5 is specifically for obstruction of duodenum. Related codes cover acute dilatation of stomach (K31.0), adult hypertrophic pyloric stenosis (K31.1), Hourglass stricture and stenosis of stomach (K31.2), Pylorospasm, not elsewhere classified (K31.3), gastric diverticulum (K31.4), fistula of stomach and duodenum (K31.6), polyp of stomach and duodenum (K31.7), other specified diseases of stomach and duodenum (K31.8) and 3 more.
Don't report K31.5 together with the conditions in its Excludes1 note: congenital stenosis of duodenum (Q41.0).
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.
Don't confuse with (Excludes1 for K31.5)
- congenital stenosis of duodenum (Q41.0)
Common questions about duodenum constriction ICD-10 codes
What is the ICD-10 code for duodenum constriction?
- K31.5 — Obstruction of duodenum.
Is K31.5 billable?
- Yes. K31.5 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K31.5 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K31.5 as a principal diagnosis.
Is K31.5 a CC or MCC?
- K31.5 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.