A04

Non-Billable
ChapterA00–B99
Rankcategory
Official Description

Other bacterial intestinal infections

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here)
  • carrier or suspected carrier of infectious disease (Z22.-)
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)
Use Additional Code
  • code to identify resistance to antimicrobial drugs (Z16.-)

Instructional Notes

Excludes1(Not coded here)
  • bacterial foodborne intoxications, NEC (A05.-)
  • tuberculous enteritis (A18.32)

Clinical Hierarchy

CH1Certain infectious and parasitic diseases (A00-B99)
A00-A09Intestinal infectious diseases (A00-A09)
A04Other bacterial intestinal infections
A04.0Enteropathogenic Escherichia coli infection
A04.1Enterotoxigenic Escherichia coli infection
A04.2Enteroinvasive Escherichia coli infection
A04.3Enterohemorrhagic Escherichia coli infection
A04.4Other intestinal Escherichia coli infections
A04.5Campylobacter enteritis
A04.6Enteritis due to Yersinia enterocolitica
A04.7Enterocolitis due to Clostridium difficile
A04.8Other specified bacterial intestinal infections
A04.9Bacterial intestinal infection, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A04:

chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to A04. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

25 raw paths
Arthropathy1 unique routes
postinfectious NEC
in (due to)
enteritis due to Yersinia enterocolitica→A04
Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)7 unique routes4 duplicates hidden
Clostridium difficile(4 variants)
not specified as recurrent→A04(2 variants)
recurrent→A04(2 variants)
pseudomembranous(2 variants)
not specified as recurrent→A04
recurrent→A04
staphylococcal→A04
toxic NEC(4 variants)
due to(4 variants)
Clostridium difficile(4 variants)
not specified as recurrent→A04(2 variants)
recurrent→A04(2 variants)
Diarrhea, diarrheal (disease) (infantile) (inflammatory)13 unique routes
due to(13 variants)
Campylobacter→A04
Clostridium difficile(2 variants)
not specified as recurrent→A04
recurrent→A04
Clostridium perfringens (C) (F)→A04
Escherichia coli→A04(7 variants)
enteroaggregative→A04
enterohemorrhagic→A04
enteroinvasive→A04
enteropathogenic→A04
enterotoxigenic→A04
specified NEC→A04
Staphylococcus→A04
Yersinia enterocolitica→A04

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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