2027 ICD-10-CM Diagnosis Code A03Shigellosis

ICD-10-CM Codes›A00–B99›A00-A09›A03

ICD-10-CM A03
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Shigellosis
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A03: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • 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

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name A03, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming A03: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block P35-P39 Infections specific to the perinatal period
    intestinal infectious disease (A00-A09) names A00-A09, which includes this code
  • P37 Other congenital infectious and parasitic diseases
    infectious neonatal diarrhea (A00-A09) names A00-A09, which includes this code

Code First 1

These codes say to code first a condition named in the note, and A03 is one of the conditions named.

  • M49 Spondylopathies in diseases classified elsewhere
    enterobacterial infections (A01-A04) names A01-A04, which includes this code

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A03Overview

What is the ICD-10 code for shigellosis?

A03 is the ICD-10-CM category for shigellosis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.