K35.201 Acute appendicitis with generalized peritonitis, with perforation, without abscess

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

Applicable to

• Appendicitis (acute) with generalized (diffuse) peritonitis following rupture or perforation of appendix NOS

MS-DRG index

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

Code annotations containing back-references to K35.201

Back-references to K35.2

• Type 1 Excludes: K37 Unspecified appendicitis ("unspecified appendicitis with peritonitis (K35.2-, K35.3-)")
• Type 2 Excludes: K63.1 Perforation of intestine (nontraumatic) ("perforation (nontraumatic) of appendix (K35.2-, K35.3-)")
• Type 1 Excludes: K65 Peritonitis ("acute appendicitis with generalized peritonitis (K35.2-)")

Back-references to K35

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

Diagnosis Index entries for K35.201

• Appendicitis (pneumococcal) (retrocecal) › with › peritonitis NEC › generalized › with › perforation or rupture
• Appendicitis (pneumococcal) (retrocecal) › with › peritonitis NEC › generalized › following rupture or perforation of appendix NOS
• Appendicitis (pneumococcal) (retrocecal) › acute (catarrhal) (fulminating) (obstructive) (retrocecal) (suppurative) › with › peritonitis NEC › generalized › with › perforation or rupture
• Appendicitis (pneumococcal) (retrocecal) › acute (catarrhal) (fulminating) (obstructive) (retrocecal) (suppurative) › with › peritonitis NEC › generalized › following rupture or perforation of appendix NOS

Nearby codes

• K35 Acute appendicitis
• K35.2 Acute appendicitis with generalized peritonitis
• K35.20 Acute appendicitis with generalized peritonitis, without abscess
• K35.200 Acute appendicitis with generalized peritonitis, without perforation or abscess
• K35.201 Acute appendicitis with generalized peritonitis, with perforation, without abscess (this code)
• K35.209 Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation
• K35.21 Acute appendicitis with generalized peritonitis, with abscess
• 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