ICD-10 Code K35.219 – Acute appendicitis with generalized peritonitis, with abscess, unspecified as to perforation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K35.219 – Acute appendicitis with generalized peritonitis, with abscess, unspecified as to perforation
What it is
This code identifies acute appendicitis complicated by generalized peritonitis and an abscess. It is used when the record does not specify whether the appendix was perforated.
Clinical signs
Typical documentation may describe right lower quadrant abdominal pain, diffuse peritoneal irritation, and imaging or operative findings of abscess with generalized peritonitis. Clinical features vary; refer to documentation.
When to use this code
Use K35.219 when the provider documents acute appendicitis with generalized peritonitis and an abscess, but does not state perforation status. Apply it from operative, imaging, or discharge documentation that clearly links all three elements. If the record specifies perforation, use the more specific code instead.
Do not use for
Do not use this code for uncomplicated appendicitis, localized peritonitis only, or appendicitis without abscess. Check documentation if the chart mentions perforation, because that detail changes code selection.
Coding tip
Confirm that both generalized peritonitis and abscess are documented together before assigning K35.219.