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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Diseases Of Esophagus, Stomach, And Duodenum 530-538 > Other Disorders Of Stomach And Duodenum 537.* > 2007 ICD-9-CM Diagnosis 537.9 Unspecified disorder of stomach and duodenum  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 537.9 can be accessed here. 537.9 is a specific code that can be used to specify a diagnosis 537.9 contains 5 index entries View the ICD-9-CM Volume 1 537.* hierarchy Index entries containing 537.9: Disease, diseased - see also Syndrome duodenum NEC 537.9 specified NEC 537.89 gastric (see also Disease, stomach) 537.9 stomach NEC (organic) 537.9 functional 536.9 psychogenic 306.4 lardaceous 277.39 Dysfunction pylorus 537.9 Gastropathy 537.9 erythematous 535.5 exudative 579.8