Specific code 2012 ICD-9-CM Diagnosis Code 555.1
Regional enteritis of large intestine
  • Short description: Reg enteritis, lg intest.
  • ICD-9-CM 555.1 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 555.1 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
  • You are viewing the 2012 version of ICD-9-CM 555.1.
  • More recent version(s) of ICD-9-CM 555.1: 2013 2014.
Disease Synonyms
  • Abscess of intestine due to Crohn's disease of large intestine
  • Complication due to Crohn's disease of large intestine
  • Crohns disease of colon
  • Crohn's disease of colon
  • Crohns disease of colon w abscess
  • Crohns disease of colon w complication
  • Crohns disease of colon w fistula
  • Crohns disease of colon w obstruction
  • Crohns disease of colon w rectal bleeding
  • Crohns disease of colon with abscess
  • Crohns disease of colon with complication
  • Crohns disease of colon with fistula
  • Crohns disease of colon with obstruction
  • Crohns disease of colon with rectal bleeding
  • Crohn's disease of large bowel
  • Crohns disease of rectum
  • Crohn's disease of rectum
  • Crohns disease, colon
  • Crohns disease, large intestine
  • Crohns disease, rectum
  • Fistula of intestine due to Crohn's disease of large intestine
  • Intestinal obstruction due to Crohn's disease of large intestine
  • Rectal hemorrhage due to Crohn's disease of large intestine
Applies To
  • Colitis:
    • granulomatous
    • regional
    • transmural
  • Regional enteritis or Crohn's disease of:
    • colon
    • large bowel
    • rectum
Convert to ICD-10-CM: 555.1 converts approximately to:
  • 2014 ICD-10-CM K50.10 Crohn's disease of large intestine without complications
ICD-9-CM Volume 2 Index entries containing back-references to 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
        • small (duodenum, ileum, or jejunum) 555.0
          • with large intestine 555.2
  • Inflammation, inflamed, inflammatory (with exudation)
    • colon (see also Enteritis) 558.9
      • granulomatous 555.1
      • newborn 558.9
  • Proctitis 569.49
    • granulomatous 555.1
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 555.1 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2012 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.