ICD-10-CM > K00-K95 > K35-K38 > K35 > K35.2 > K35.20 K35.20 Acute appendicitis with generalized peritonitis, without abscess Non-Billable/Non-Specific Codes K35.200Acute appendicitis with generalized peritonitis, without perforation or abscessK35.201Acute appendicitis with generalized peritonitis, with perforation, without abscessK35.209Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation