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K35.21

⚠ Non-billable (Header)

Acute appendicitis with generalized peritonitis, with abscess

Diseases of the digestive system (K00-K95)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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✅ No additional coding notes for K35.21

Child Codes (3)

K35.210Acute appendicitis with generalized peritonitis, without perforation, with abscessK35.211Acute appendicitis with generalized peritonitis, with perforation and abscessK35.219Acute appendicitis with generalized peritonitis, with abscess, unspecified as to perforation

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Code Information

CodeK35.21
BillableNo — Header code
ParentK35.2
CategoryDiseases of the digestive system (K00-K95)
Excludes10 rule(s)
Excludes20 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)