K63.1 Perforation of intestine (nontraumatic)

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

Applicable to

• Perforation (nontraumatic) of rectum

Excludes1 (never code together)

• perforation (nontraumatic) of duodenum (K26.-)
• perforation (nontraumatic) of intestine with diverticular disease (K57.0, K57.2, K57.4, K57.8)

Excludes2 (not included here)

• perforation (nontraumatic) of appendix (K35.2-, K35.3-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 78 — Intestinal Obstruction/Perforation
• CMS-HCC V22: HCC 33 — Intestinal Obstruction/Perforation
• ESRD V24: HCC 33

MS-DRG index

Defines the logic of DRG(s) 393-395 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 569.83 Perforation of intestine

Code annotations containing back-references to K63.1

Back-references to K63.1

• Type 1 Excludes: K63.3 Ulcer of intestine ("ulcer of intestine with perforation (K63.1)")

Diagnosis Index entries for K63.1

• Perforation, perforated (nontraumatic) (of) › bowel
• Perforation, perforated (nontraumatic) (of) › colon
• Perforation, perforated (nontraumatic) (of) › ileum
• Perforation, perforated (nontraumatic) (of) › intestine NEC
• Perforation, perforated (nontraumatic) (of) › intestine NEC › ulcerative NEC
• Perforation, perforated (nontraumatic) (of) › jejunum, jejunal
• Perforation, perforated (nontraumatic) (of) › rectum
• Perforation, perforated (nontraumatic) (of) › sigmoid
• Rupture, ruptured › bowel (nontraumatic)
• Rupture, ruptured › colon (nontraumatic)
• Rupture, ruptured › intestine NEC (nontraumatic)
• Rupture, ruptured › rectum (nontraumatic)
• Rupture, ruptured › sigmoid (nontraumatic)
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › intestine, intestinal › with perforation
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › intestine, intestinal › perforating
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › primary of intestine › with perforation
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › rectosigmoid › with perforation
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › stercoraceous, stercoral › with perforation

Nearby codes

• K63 Other diseases of intestine
• K63.0 Abscess of intestine
• K63.1 Perforation of intestine (nontraumatic) (this code)
• K63.2 Fistula of intestine
• K63.3 Ulcer of intestine
• K63.4 Enteroptosis
• K63.5 Polyp of colon
• K63.8 Other specified diseases of intestine