2026 ICD-10-CM Diagnosis Code A03Shigellosis

ICD-10-CM Codes›A00–B99›A00-A09›A03

ICD-10-CM A03
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A03 is a non-billable ICD-10-CM category code for shigellosis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A03.0, A03.1, A03.2, and A03.3.

Code Identity

ICD-10-CM Code
A03
Billable Status
No — Non-Billable Category
Code Describes
Shigellosis
Chapter
A00-A09
Intestinal infectious diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA00-A09Intestinal infectious diseases
CategoryA03Shigellosis
This CodeA03Shigellosis

Specific Coding for ShigellosisOverview

Non-specific codes like A03 require more characters. Use one of these billable codes instead:

  • Use A03.0 for Shigellosis due to Shigella dysenteriae

  • Use A03.1 for Shigellosis due to Shigella flexneri

  • Use A03.2 for Shigellosis due to Shigella boydii

  • Use A03.3 for Shigellosis due to Shigella sonnei

  • Use A03.8 for Other shigellosis

  • Use A03.9 for Shigellosis, unspecified

Clinical InformationClinical

  • Shigellosis

    an intestinal disease cause by shigella bacteria.

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 A03Overview

Is A03 (Shigellosis) a billable code?

No. This is a category header that groups the codes for shigellosis, and headers cannot be submitted on claims. Claims for shigellosis need a more specific code from this category, such as A03.0, A03.1, and A03.2.