Is K35.21 a billable code?
No. K35.21 is a header code that groups 3 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
K35.21: Acute appendicitis with generalized peritonitis, with abscess
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
K35.21 groups related diagnoses under acute appendicitis with generalized peritonitis, with abscess. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under K35.21
- K35.210Acute appendicitis with generalized peritonitis, without perforation, with abscess
- K35.211Acute appendicitis with generalized peritonitis, with perforation and abscess
- K35.219Acute appendicitis with generalized peritonitis, with abscess, unspecified as to perforation
Other codes in K35.2 Acute appendicitis with generalized peritonitis
K35.21 questions
What does K35.21 mean?
K35.21 is the ICD-10-CM code for Acute appendicitis with generalized peritonitis, with abscess. It is in chapter 11, Diseases of the digestive system (K00-K95).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.