Ac appendicitis with gen peritonitis, w/o perf, with abscs

This code describes an acute inflammation of the appendix that has progressed to involve the entire abdominal cavity with peritonitis, but without a rupture of the appendix itself. An abscess is also present, indicating a localized collection of pus associated with the appendicitis.

Apply this code when documentation clearly states acute appendicitis, generalized peritonitis, and an abscess, specifically noting the absence of perforation. This typically occurs in patients presenting with severe abdominal pain, fever, and signs of systemic infection, where imaging confirms the appendiceal inflammation and abscess formation without evidence of a free perforation.

• Ensure documentation explicitly states "generalized peritonitis" and "without perforation."
• Distinguish from localized peritonitis (K35.20) or appendicitis with perforation (K35.3-).
• Verify the presence and location of the abscess as documented by the physician or radiologist.