K35.31 Acute appendicitis with localized peritonitis and gangrene, without perforation

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

MS-DRG index

Defines the logic of DRG(s) 371-373 in MDC 06.

Code annotations containing back-references to K35.31

Back-references to K35.3

• Type 1 Excludes: K37 Unspecified appendicitis ("unspecified appendicitis with peritonitis (K35.2-, K35.3-)")
• Type 2 Excludes: K63.0 Abscess of intestine ("abscess of appendix (K35.3-)")
• Type 2 Excludes: K63.1 Perforation of intestine (nontraumatic) ("perforation (nontraumatic) of appendix (K35.2-, K35.3-)")

Back-references to K35

• Type 1 Excludes: K65 Peritonitis ("peritonitis with or following appendicitis (K35.-)")

Diagnosis Index entries for K35.31

• Appendicitis (pneumococcal) (retrocecal) › with › gangrene › with localized peritonitis
• Appendicitis (pneumococcal) (retrocecal) › with › peritonitis NEC › localized › with › gangrene
• Appendicitis (pneumococcal) (retrocecal) › acute (catarrhal) (fulminating) (obstructive) (retrocecal) (suppurative) › with › peritonitis NEC › localized › with › gangrene
• Appendicitis (pneumococcal) (retrocecal) › acute (catarrhal) (fulminating) (obstructive) (retrocecal) (suppurative) › specified NEC › with gangrene › with localized peritonitis
• Gangrene, gangrenous (connective tissue) (dropsical) (dry) (moist) (skin) (ulcer) › appendix › with › peritonitis, localized

Nearby codes

• K35.210 Acute appendicitis with generalized peritonitis, without perforation, with abscess
• K35.211 Acute appendicitis with generalized peritonitis, with perforation and abscess
• K35.219 Acute appendicitis with generalized peritonitis, with abscess, unspecified as to perforation
• K35.3 Acute appendicitis with localized peritonitis
• K35.30 Acute appendicitis with localized peritonitis, without perforation or gangrene
• K35.31 Acute appendicitis with localized peritonitis and gangrene, without perforation (this code)
• K35.32 Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscess
• K35.33 Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess
• K35.8 Other and unspecified acute appendicitis
• K35.80 Unspecified acute appendicitis
• K35.89 Other acute appendicitis