K35.20

Non-Billable

ChapterK00–K95

Ranksubcategory

Official Description

Acute appendicitis with generalized peritonitis, without abscess

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•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

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

K35.200Acute appendicitis with generalized peritonitis, without perforation or abscess

K35.201Acute appendicitis with generalized peritonitis, with perforation, 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 K35.20:

chapterCH11

Diseases of the digestive system (K00-K95)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to K35.20. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

9 raw paths

Appendicitis (pneumococcal) (retrocecal)8 unique routes

acute (catarrhal) (fulminating) (obstructive) (retrocecal) (suppurative)(4 variants)

with(4 variants)

peritonitis NEC(4 variants)

generalized→K35.20(4 variants)

following rupture or perforation of appendix NOS→K35.20

with

perforation or rupture→K35.20

without rupture or perforation of appendix→K35.20

with(4 variants)

peritonitis NEC(4 variants)

generalized→K35.20(4 variants)

following rupture or perforation of appendix NOS→K35.20

with

perforation or rupture→K35.20

without rupture or perforation of appendix→K35.20

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

with or following

appendicitis

generalized→K35.20

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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