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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Other Diseases Of Intestines And Peritoneum 560-569 > Functional Digestive Disorders Not Elsewhere Classified 564.* > 2008 ICD-9-CM Diagnosis 564.7 Megacolon other than hirschsprung's Dilatation of the COLON, often to alarming dimensions. There are various types of megacolon including congenital megacolon in HIRSCHSPRUNG DISEASE, idiopathic megacolon in CONSTIPATION, and TOXIC MEGACOLON. 564.7 is a specific code that can be used to specify a diagnosis 564.7 contains 6 index entries View the ICD-9-CM Volume 1 564.* hierarchy 564.7 also known as: Dilatation of colon 564.7 excludes: megacolon: congenital [Hirschsprung's] (751.3) toxic (556) Index entries containing 564.7: Dilatation colon 564.7 congenital 751.3 due to mechanical obstruction 560.89 psychogenic 306.4 Excess, excessive, excessively large colon 564.7 congenital 751.3 Macrosigmoid 564.7 congenital 751.3 Megacolon (acquired) (functional) (not Hirschsprung's disease) 564.7 aganglionic 751.3 congenital, congenitum 751.3 Hirschsprung's (disease) 751.3 psychogenic 306.4 toxic (see also Colitis, ulcerative) 556.9 Megasigmoid 564.7 congenital 751.3 Syndrome - see also Disease faulty bowel habit (idiopathic megacolon) 564.7