K50.913 Crohn's disease, unspecified, with fistula

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from K50 Crohn's disease [regional enteritis]

Includes

• granulomatous enteritis

Excludes1 (never code together)

• ulcerative colitis (K51.-)

Use additional code

• 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)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 80 — Crohn's Disease (Regional Enteritis)
• CMS-HCC V22: HCC 35 — Inflammatory Bowel Disease
• RxHCC V08: HCC 67 — Inflammatory Bowel Disease
• ESRD V24: HCC 35

MS-DRG index

Defines the logic of DRG(s) 385-387 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 555.9 Regional enteritis of unspecified site (approximate)
• 569.81 Fistula of intestine, excluding rectum and anus (approximate)

Code annotations containing back-references to K50.913

Back-references to K50.913

• Type 1 Excludes: K63.2 Fistula of intestine ("fistula of intestine with Crohn's disease (K50.013, K50.113, K50.813, K50.913,)")

Back-references to K50

• Type 1 Excludes: E55.0 Rickets, active ("Crohn's rickets (K50.-)")
• Type 1 Excludes: K51 Ulcerative colitis ("Crohn's disease [regional enteritis] (K50.-)")
• Code First: K60.3 Anal fistula ("Crohn's disease (K50.-)")
• Code First: K60.4 Rectal fistula ("Crohn's disease (K50.-)")
• Code First: K60.5 Anorectal fistula ("Crohn's disease (K50.-)")
• Type 2 Excludes: M04 Autoinflammatory syndromes ("Crohn's disease (K50.-)")
• Code Also: M07 Enteropathic arthropathies ("regional enteritis [Crohn's disease] (K50.-)")
• Code Also: M08 Juvenile arthritis ("regional enteritis [Crohn's disease] (K50.-)")

Diagnosis Index entries for K50.913

• Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) › regional (of) › with › complication › fistula

Nearby codes

• K50.9 Crohn's disease, unspecified
• K50.90 Crohn's disease, unspecified, without complications
• K50.91 Crohn's disease, unspecified, with complications
• K50.911 Crohn's disease, unspecified, with rectal bleeding
• K50.912 Crohn's disease, unspecified, with intestinal obstruction
• K50.913 Crohn's disease, unspecified, with fistula (this code)
• K50.914 Crohn's disease, unspecified, with abscess
• K50.918 Crohn's disease, unspecified, with other complication
• K50.919 Crohn's disease, unspecified, with unspecified complications