K35.8 Other and unspecified acute appendicitisNon-billable header with 2 child codes.
K65 Peritonitis ("peritonitis with or following appendicitis (K35.-)")K35.3 Acute appendicitis with localized peritonitisK35.30 Acute appendicitis with localized peritonitis, without perforation or gangreneK35.31 Acute appendicitis with localized peritonitis and gangrene, without perforationK35.32 Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscessK35.33 Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscessK35.8 Other and unspecified acute appendicitis (this code)K35.80 Unspecified acute appendicitisK35.89 Other acute appendicitisK35.890 Other acute appendicitis without perforation or gangreneK35.891 Other acute appendicitis without perforation, with gangrene