K57.12 Diverticulitis of small intestine without perforation or abscess without bleeding

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

Applies from K57 Diverticular disease of intestine

Excludes1 (never code together)

• congenital diverticulum of intestine (Q43.8)
• Meckel's diverticulum (Q43.0)

Excludes2 (not included here)

• diverticulum of appendix (K38.2)

Code also

• if applicable peritonitis K65.-

Applies from K57.1 Diverticular disease of small intestine without perforation or abscess

Excludes1 (never code together)

• diverticular disease of both small and large intestine without perforation or abscess (K57.5-)

MS-DRG index

Defines the logic of DRG(s) 391-392 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 562.01 Diverticulitis of small intestine (without mention of hemorrhage) (approximate)

Code annotations containing back-references to K57.12

Back-references to K57.12

• Type 2 Excludes: K31 Other diseases of stomach and duodenum ("diverticulum of duodenum (K57.00-K57.13)")

Back-references to K57

• Code Also: K65 Peritonitis ("if applicable diverticular disease of intestine (K57.-)")
• Type 1 Excludes: K92.2 Gastrointestinal hemorrhage, unspecified ("diverticular disease with hemorrhage (K57.-)")

Diagnosis Index entries for K57.12

• Diverticulitis (acute) › intestine › small

Nearby codes

• K57.00 Diverticulitis of small intestine with perforation and abscess without bleeding
• K57.01 Diverticulitis of small intestine with perforation and abscess with bleeding
• K57.1 Diverticular disease of small intestine without perforation or abscess
• K57.10 Diverticulosis of small intestine without perforation or abscess without bleeding
• K57.11 Diverticulosis of small intestine without perforation or abscess with bleeding
• K57.12 Diverticulitis of small intestine without perforation or abscess without bleeding (this code)
• K57.13 Diverticulitis of small intestine without perforation or abscess with bleeding
• K57.2 Diverticulitis of large intestine with perforation and abscess
• K57.20 Diverticulitis of large intestine with perforation and abscess without bleeding
• K57.21 Diverticulitis of large intestine with perforation and abscess with bleeding
• K57.3 Diverticular disease of large intestine without perforation or abscess