K63.3 Ulcer of intestine

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

Applicable to

• Primary ulcer of small intestine

Excludes1 (never code together)

• duodenal ulcer (K26.-)
• gastrointestinal ulcer (K28.-)
• gastrojejunal ulcer (K28.-)
• jejunal ulcer (K28.-)
• peptic ulcer, site unspecified (K27.-)
• ulcer of intestine with perforation (K63.1)
• ulcer of anus or rectum (K62.6)
• ulcerative colitis (K51.-)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 569.82 Ulceration of intestine

Code annotations containing back-references to K63.3

Back-references to K63.3

• Type 1 Excludes: K28 Gastrojejunal ulcer ("primary ulcer of small intestine (K63.3)")

Diagnosis Index entries for K63.3

• Erosion › intestine
• Stercoraceous, stercoral ulcer
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › intestine, intestinal
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › intestine, intestinal › primary, small intestine
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › intestine, intestinal › stercoraceous, stercoral
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › primary of intestine
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › rectosigmoid
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › stercoraceous, stercoral

Nearby codes

• K63 Other diseases of intestine
• K63.0 Abscess of intestine
• K63.1 Perforation of intestine (nontraumatic)
• K63.2 Fistula of intestine
• K63.3 Ulcer of intestine (this code)
• K63.4 Enteroptosis
• K63.5 Polyp of colon
• K63.8 Other specified diseases of intestine
• K63.81 Dieulafoy lesion of intestine
• K63.82 Intestinal microbial overgrowth