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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Noninfective Enteritis And Colitis 555-558 > Regional Enteritis 555.* > 2007 ICD-9-CM Diagnosis 555.0 Regional enteritis of small 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 Therefore, this code may be out of date.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 555.0 can be accessed here. 555.0 is a specific code that can be used to specify a diagnosis 555.0 contains 6 index entries View the ICD-9-CM Volume 1 555.* hierarchy 555.0 also known as: Ileitis: regional segmental terminal Regional enteritis or Crohn's disease of: duodenum ileum jejunum Index entries containing 555.0: Enteritis (acute) (catarrhal) (choleraic) (chronic) (congestive) (diarrheal) (exudative) (follicular) (hemorrhagic) (infantile) (lienteric) (noninfectious) (perforative) (phlegmonous) (presumed noninfectious) (pseudomembranous) 558.9 cicatrizing (chronic) 555.0 regional (of) 555.9 intestine small (duodenum, ileum, or jejunum) 555.0 with large intestine 555.2 Ileitis (chronic) (see also Enteritis) 558.9 regional (ulcerative) 555.0 with large intestine 555.2 segmental 555.0 with large intestine 555.2 terminal (ulcerative) 555.0 with large intestine 555.2 Inflammation, inflamed, inflammatory (with exudation) ileum (see also Enteritis) 558.9 terminal or regional 555.0 with large intestine 555.2