2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Other Diseases Of Intestines And Peritoneum 560-569 > 2006 ICD-9-CM Diagnosis 564 Functional digestive disorders not elsewhere classified View the most recent version of ICD-9-CM 564 564 is a non-specific code that cannot be used to specify a diagnosis 564 Excludes functional disorders of stomach (536.0-536.9) those specified as psychogenic (306.4)