All ICD10 Codes

K35.21

Non-Billable
ChapterK00–K95
Ranksubcategory
Official Description

Acute appendicitis with generalized peritonitis, with abscess

Use a more specific code (3 billable)
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
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 11: Diseases of the Digestive System (K00-K95).
General instructions are available for the parent sections:
View CH11 Notes

Clinical Hierarchy

BillableHas subcodes
CH11Diseases of the digestive system (K00-K95)
K35-K38Diseases of appendix (K35-K38)
K35Acute appendicitis
K35.2Acute appendicitis with generalized peritonitis
K35.21Acute appendicitis with generalized peritonitis, with abscessNot billable
K35.210Acute appendicitis with generalized peritonitis, without perforation, with abscessBillable
K35.211Acute appendicitis with generalized peritonitis, with perforation and abscessBillable
K35.219Acute appendicitis with generalized peritonitis, with abscess, unspecified as to perforationBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to K35.21:

chapterCH11
Diseases of the digestive system (K00-K95)
View context instructions

Code History

  • FY 2023: Superseded by K35.210
  • FY 2023: Superseded by K35.211
  • FY 2023: Superseded by K35.219
  • FY 2018: This code replaced K35.2 (Acute appendicitis with generalized peritonitis)

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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