What does ICD-10 code A03 mean?

ICD-10 code A03 is the standardized code used for shigellosis in medical records and coding systems.

When is ICD-10 code A03 used?

Doctors, hospitals, and insurers may use ICD-10 code A03 when recording shigellosis in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code A03 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code A03: Shigellosis

Name: ICD-10 Code A03: Shigellosis
Creator: HealthAssure Clinical Team
Published: 2026-05-21T05:57:50.368Z

A03 is an ICD-10 diagnosis entry used to group records related to Shigellosis. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

When is it used?

May be used when a clinician documents shigellosis in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

1Certain infectious and parasitic diseases (A00-B99)

block

A00-A09Intestinal infectious diseases

currentA00-A09

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

Infectious Disease SpecialistGeneral Physician

Sibling codes

A00Cholera A01Typhoid and paratyphoid fevers A02Other salmonella infections A04Other bacterial intestinal infections A05Other bacterial foodborne intoxications, not elsewhere classified A06Amebiasis A07Other protozoal intestinal diseases A08Viral and other specified intestinal infections A09Infectious gastroenteritis and colitis, unspecifiedbillable

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

A03

Replacement codes

A03.0 — Shigellosis due to Shigella dysenteriaeA03.1 — Shigellosis due to Shigella flexneriA03.2 — Shigellosis due to Shigella boydiiA03.3 — Shigellosis due to Shigella sonneiA03.8 — Other shigellosisA03.9 — Shigellosis, unspecified

Common synonyms

Shigellosis

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.