A03

Non-Billable
ChapterA00–B99
Rankcategory
Official Description

Shigellosis

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here)
  • carrier or suspected carrier of infectious disease (Z22.-)
  • 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
  • code to identify resistance to antimicrobial drugs (Z16.-)

Clinical Hierarchy

CH1Certain infectious and parasitic diseases (A00-B99)
A00-A09Intestinal infectious diseases (A00-A09)
A03Shigellosis
A03.0Shigellosis due to Shigella dysenteriae
A03.1Shigellosis due to Shigella flexneri
A03.2Shigellosis due to Shigella boydii
A03.3Shigellosis due to Shigella sonnei
A03.8Other shigellosis
A03.9Shigellosis, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A03:

chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to A03. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

25 raw paths
Bacillus2 unique routes
Flexner's→A03
Shiga's→A03
Boyd's dysentery1 unique routes
Direct index entry→A03
Chinese dysentery1 unique routes
Direct index entry→A03
Diarrhea, diarrheal (disease) (infantile) (inflammatory)1 unique routes
Flexner's (ulcerative)→A03
Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical)20 unique routes
arthritis
bacillary→A03
bacillary→A03(11 variants)
Boyd→A03
Flexner→A03
Schmitz (-Stutzer)→A03
Shiga (-Kruse)→A03
Shigella→A03(6 variants)
boydii→A03
dysenteriae→A03
flexneri→A03
group A→A03
group B→A03
Boyd's→A03
Chinese→A03
Flexner-Boyd→A03
Flexner's→A03
Hiss-Russell→A03
Schmitz (-Stutzer)→A03
Shiga (-Kruse)→A03
Sonne→A03

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Shigellosis.

Search PCS Codes