K35.3
⚠ Non-billable (Header)Acute appendicitis with localized peritonitis
Diseases of the digestive system (K00-K95)
⚠️ This is a category header code — not billable. Use a more specific child code below.
✅ No additional coding notes for K35.3
Child Codes (4)
K35.30Acute appendicitis with localized peritonitis, without perforation or gangreneK35.31Acute appendicitis with localized peritonitis and gangrene, without perforationK35.32Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscessK35.33Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess
🧪 Validate Combinations
Add K35.3 to the Excludes Checker to validate against your full code list.
Open in Checker →Code Information
CodeK35.3
BillableNo — Header code
ParentK35
CategoryDiseases of the digestive system (K00-K95)
Excludes10 rule(s)
Excludes20 note(s)
Child codes4
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)