K37 Unspecified appendicitis

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• unspecified appendicitis with peritonitis (K35.2-, K35.3-)

Applies from K37 Unspecified appendicitis

Excludes1 (never code together)

• unspecified appendicitis with peritonitis (K35.2-, K35.3-)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 541 Appendicitis, unqualified

Diagnosis Index entries for K37

• Appendicitis (pneumococcal) (retrocecal)
• Perityphlitis

Nearby codes

• K37 Unspecified appendicitis (this code)