Specific code 2012 ICD-9-CM Diagnosis Code 555.9
Regional enteritis of unspecified site
  • Short description: Regional enteritis NOS.
  • ICD-9-CM 555.9 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 555.9 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 555.9.
  • More recent version(s) of ICD-9-CM 555.9: 2013 2014.
Disease Synonyms
  • Abscess of intestine due to Crohn's disease
  • Arthritis due to Crohn's disease
  • Complication due to Crohn's disease
  • Crohns disease
  • Crohn's disease
  • Crohns disease w abscess
  • Crohns disease w arthritis
  • Crohns disease w complication
  • Crohns disease w fistula
  • Crohns disease w obstruction
  • Crohns disease w rectal bleeding
  • Crohns disease with abscess
  • Crohn's disease with arthritis
  • Crohns disease with complication
  • Crohns disease with fistula
  • Crohns disease with obstruction
  • Crohns disease with rectal bleeding
  • Fistula of intestine due to Crohn's disease
  • Intestinal obstruction due to Crohn's disease
  • Rectal hemorrhage due to Crohn's disease
Applies To
  • Crohn's disease NOS
  • Regional enteritis NOS
Convert to ICD-10-CM: 555.9 converts approximately to:
  • 2014 ICD-10-CM K50.90 Crohn's disease, unspecified, without complications
ICD-9-CM Volume 2 Index entries containing back-references to 555.9:
  • Crohn's disease (see also Enteritis, regional) 555.9
  • Disease, diseased - see also Syndrome
    • Crohn's (intestine) (see also Enteritis, regional) 555.9
  • 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
    • segmental (see also Enteritis, regional) 555.9
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 555.9 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.