2026 ICD-10-CM Diagnosis Code A04Other bacterial intestinal infections

ICD-10-CM Codes›A00–B99›A00-A09›A04

ICD-10-CM A04
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A04 is a non-billable ICD-10-CM category code for other bacterial intestinal infections, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A04.0, A04.1, A04.2, and A04.3.

Code Identity

ICD-10-CM Code
A04
Billable Status
No — Non-Billable Category
Code Describes
Other bacterial intestinal infections
Chapter
A00-A09
Intestinal infectious diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA00-A09Intestinal infectious diseases
CategoryA04Other bacterial intestinal infections
This CodeA04Other bacterial intestinal infections

Specific Coding for Other bacterial intestinal infectionsOverview

Non-specific codes like A04 require more characters. Use one of these billable codes instead:

  • Use A04.0 for Enteropathogenic Escherichia coli infection

  • Use A04.1 for Enterotoxigenic Escherichia coli infection

  • Use A04.2 for Enteroinvasive Escherichia coli infection

  • Use A04.3 for Enterohemorrhagic Escherichia coli infection

  • Use A04.4 for Other intestinal Escherichia coli infections

  • Use A04.5 for Campylobacter enteritis

  • Use A04.6 for Enteritis due to Yersinia enterocolitica

  • A04.7 for Enterocolitis due to Clostridium difficile

  • Use A04.71 for Enterocolitis due to Clostridium difficile, recurrent

  • Use A04.72 for Enterocolitis due to Clostridium difficile, not specified as recurrent

  • Use A04.8 for Other specified bacterial intestinal infections

  • Use A04.9 for Bacterial intestinal infection, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • bacterial foodborne intoxications, NEC A05
  • tuberculous enteritis A18.32

Patient EducationClinical

Bacterial Infections

Bacteria are tiny organisms (living things) that have only one cell. Under a microscope, they look like balls, rods, or spirals. They can be found almost everywhere on Earth. There are lots of bacteria in and on your body. In fact, your body has about 10 times more bacteria cells than human cells.

The full article covers:

  • What are bacteria?
  • How do bacterial infections spread?
  • What are the treatments for bacterial infections?
  • Can bacterial infections be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A04Overview

Is A04 (Other bacterial intestinal infections) a billable code?

No. This is a category header that groups the codes for other bacterial intestinal infections, and headers cannot be submitted on claims. Claims for other bacterial intestinal infections need a more specific code from this category, such as A04.0, A04.1, and A04.2.