ICD-10-CM > K00-K95 > K20-K31 > K31 > K31.5 K31.5 Obstruction of duodenum Billable/Specific Copy Code Copy Description Applicable To Constriction of duodenumDuodenal ileus (chronic)Stenosis of duodenumStricture of duodenumVolvulus of duodenum Type 1 Excludes congenital stenosis of duodenum (Q41.0)