K35.21
Non-billableAcute appendicitis with generalized peritonitis, with abscess
K35.21 is the ICD-10-CM code for Acute appendicitis with generalized peritonitis, with abscess. It is a non-billable category code — use a more specific child code such as K35.210 for billing.
K00-K95 Diseases of the digestive system
No additional coding notes for this code.
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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