A03Header code — not billable

Shigellosis

Chapter
1. Certain infectious and parasitic diseases
Category
A03
Effective date
October 1, 2026

Related codes in category A03

A03.0Shigellosis due to Shigella dysenteriaeYesA03.1Shigellosis due to Shigella flexneriYesA03.2Shigellosis due to Shigella boydiiYesA03.3Shigellosis due to Shigella sonneiYesA03.8Other shigellosisYesA03.9Shigellosis, unspecifiedYes

Frequently asked questions

What is ICD-10 code A03?

A03 is an ICD-10-CM diagnosis code for Shigellosis.

Is A03 a billable code?

No. A03 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is A03 in?

A03 falls under Chapter 1: Certain infectious and parasitic diseases.

When did A03 become effective?

A03 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to A03?

A03 belongs to category A03, which includes 6 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.