K35.209

Billable

ChapterK00–K95

Ranksubcategory

Official Description

Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Billable/specific code (valid for reimbursement).
•Chapter 11: Diseases of the Digestive System (K00-K95).

Instructional Notes

Includes

(Acute) appendicitis with generalized peritonitis NOS

General instructions are available for the parent sections:

View CH11 Notes

Clinical Hierarchy

CH11Diseases of the digestive system (K00-K95)

K35-K38Diseases of appendix (K35-K38)

K35Acute appendicitis

K35.2Acute appendicitis with generalized peritonitis

K35.20Acute appendicitis with generalized peritonitis, without abscess

K35.209Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to K35.209:

chapterCH11

Diseases of the digestive system (K00-K95)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to K35.209. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

3 raw paths

Appendicitis (pneumococcal) (retrocecal)2 unique routes

acute (catarrhal) (fulminating) (obstructive) (retrocecal) (suppurative)

with

with

Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion)1 unique routes

with or following

appendicitis

generalized→K35.209

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 371

Major Gastrointestinal Disorders and Peritoneal Infections with MCC

DRG 372

Major Gastrointestinal Disorders and Peritoneal Infections with CC

DRG 373

Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation.

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