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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Noninfective Enteritis And Colitis 555-558 > Regional Enteritis 555.* > 2008 ICD-9-CM Diagnosis 555.1 Regional enteritis of large intestine  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 Therefore, this code may be out of date.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 555.1 can be accessed here. 555.1 is a specific code that can be used to specify a diagnosis 555.1 contains 7 index entries View the ICD-9-CM Volume 1 555.* hierarchy 555.1 also known as: Colitis: granulomatous regional transmural Regional enteritis or Crohn's disease of: colon large bowel rectum Index entries containing 555.1: Colitis (acute) (catarrhal) (croupous) (cystica superficialis) (exudative) (hemorrhagic) (noninfectious) (phlegmonous) (presumed noninfectious) 558.9 granulomatous 555.1 regional 555.1 segmental 555.1 transmural 555.1 Enteritis (acute) (catarrhal) (choleraic) (chronic) (congestive) (diarrheal) (exudative) (follicular) (hemorrhagic) (infantile) (lienteric) (noninfectious) (perforative) (phlegmonous) (presumed noninfectious) (pseudomembranous) 558.9 regional (of) 555.9 intestine large (bowel, colon, or rectum) 555.1 with small intestine 555.2 Inflammation, inflamed, inflammatory (with exudation) colon (see also Enteritis) 558.9 granulomatous 555.1 Proctitis 569.49 granulomatous 555.1