2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Diseases Of Esophagus, Stomach, And Duodenum 530-537 > Gastritis And Duodenitis 535.* > 2006 ICD-9-CM Diagnosis 535.6 Duodenitis View the most recent version of ICD-9-CM 535.6 Inflammation of the DUODENUM section of the small intestine (INTESTINE, SMALL). Erosive duodenitis may cause bleeding in the UPPER GI TRACT and PEPTIC ULCER. 535.6 is a non-specific code that cannot be used to specify a diagnosis 535.6 contains 3 index entries View the ICD-9-CM Volume 1 535.* hierarchy  Index entries containing 535.6: Infection, infected, infective (opportunistic) 136.9 duodenum 535.6 Inflammation, inflamed, inflammatory (with exudation) duodenum 535.6 Periduodenitis 535.6