All ICD10 Codes
K50Not billable, use a more specific code below

Crohn's disease [regional enteritis]

In Noninfective enteritis and colitis (K50-K52), chapter 11: Diseases of the Digestive System

28 billable codes under K50: all are a CC; all map to HCC 80 (Crohn's Disease (Regional Enteritis)), HCC 78 (Intestinal Obstruction/Perforation).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

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Instructional notes

Includes: conditions that are coded here

  • granulomatous enteritis

Excludes1: not coded here, use a different code

  • ulcerative colitis (K51.-)

Use additional code: add a second code for this, listed after this one

  • code to identify any associated fistulas, if applicable:
  • anal fistula (K60.3-)
  • anorectal fistula (K60.5-)
  • rectal fistula (K60.4-)
  • code to identify manifestations, such as:
  • pyoderma gangrenosum (L88)

Also applies, from Noninfective enteritis and colitis (K50-K52)

These notes sit on K50-K52 and apply to every code under it, including K50.

Includes: conditions that are coded here

  • noninfective inflammatory bowel disease

Excludes1: not coded here, use a different code

  • irritable bowel syndrome (K58.-)
  • megacolon (K59.3-)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

There are no chapter-specific rules for Chapter 11 yet, so the general rules in Section I.B apply.

Read Section I.C.11 (page 58)

All codes under K50

K50 can't be used on a claim. Pick a billable code below; grey headings group them.

K50 MS-DRGs

As the principal diagnosis, all 28 billable codes under K50 group to MS-DRG 385, 386, or 387 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to K50

Notes on these codes point to K50.

  • E55.0 Excludes1: Crohn's rickets (K50.-)
  • K51 Excludes1: Crohn's disease [regional enteritis] (K50.-)
  • K60.3 Code First: Crohn's disease (K50.-)
  • K60.4 Code First: Crohn's disease (K50.-)
  • K60.5 Code First: Crohn's disease (K50.-)
  • M04 Excludes2: Crohn's disease (K50.-)
  • M07 Code Also: regional enteritis [Crohn's disease] (K50.-)
  • M08 Code Also: regional enteritis [Crohn's disease] (K50.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Crohn's Disease

Crohn's disease is a chronic (long-lasting) disease that causes inflammation in your digestive tract. It can affect any part of your digestive tract, which runs from your mouth to your anus. But it usually affects your small intestine and the beginning of your large intestine.

Read more about crohn's disease on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.