2026 ICD-10-CM Diagnosis Code K50.00Crohn's disease of small intestine without complications

ICD-10-CM Codes›K00–K95›K50-K52›K50

ICD-10-CM K50.00
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K50.00 is a billable ICD-10-CM diagnosis code for Crohn's disease of small intestine without complications. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 385 through 387. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Regional enteritis and ulcerative colitis.

Code Identity

ICD-10-CM Code
K50.00
Billable Status
Yes — Valid for Submission
Code Describes
Crohn's disease of small intestine without complications
Short Description
Crohn's disease of small intestine without complications
Same as the full description in the CMS dataset.
Parent Code
K50.0
Crohn's disease of small intestine

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK50-K52Noninfective enteritis and colitis
CategoryK50Crohn's disease [regional enteritis]
This CodeK50.00Crohn's disease of small intestine without complications

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Crohn disease of small intestine in remission
  • Crohn disease of upper gastrointestinal tract
  • Crohn's disease in remission
  • Crohn's disease of duodenum
  • Crohn's disease of ileum
  • Crohn's disease of jejunum
  • Crohn's disease of small intestine
  • Crohn's disease of terminal ileum
  • Enteritis of small intestine
  • Exacerbation of Crohn's disease of small intestine
  • Ileojejunal Crohn disease
  • Jejunitis
  • Terminal ileitis
  • Terminal ileitis in remission

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Enteritis(acute) (diarrheal) (hemorrhagic) (noninfective)
      • regional (of)
        • small intestine (duodenum) (ileum) (jejunum)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG011
Regional enteritis and ulcerative colitis
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

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.

The full article covers:

  • What is Crohn's disease?
  • What causes Crohn's disease?
  • Who is more likely to develop Crohn's disease?
  • What are the symptoms of Crohn's disease?
  • What other problems can Crohn's disease cause?
  • How is Crohn's disease diagnosed?
  • What are the treatments for Crohn's disease?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert K50.00 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
555.0 Reg enteritis, sm intest
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K50.00Overview

Is K50.00 (Crohn's disease of small intestine) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report Crohn's disease of small intestine without complications on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K50.00 group to?

When Crohn's disease of small intestine without complications is the principal diagnosis on an inpatient stay, it groups to MS-DRG 385, 386, 387, with relative weights from 0.6813 to 1.5823 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K50.00?

Under the General Equivalence Mappings, Crohn's disease of small intestine without complications converts to ICD-9-CM 555.0 (reg enteritis, sm intest). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.