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    v1.0.28
    OpenPayerBilling CodesIntestinal infectious diseasesICD-10-CM a03-shigellosis
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    ICD-10-CM Code For Shigellosis: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group A03 includes diagnoses for infections caused by Shigella species, such as bacillary dysentery and other intestinal shigellosis presentations. These ICD-10-CM diagnosis codes are used to document acute enteric infection, complications like dehydration or bacteremia, and to capture organism-specific identification when available. Accurate coding within the ICD-10-CM A03 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM A03: Shigellosis Overview

    The ICD-10-CM A03 group represents infections caused by Shigella species affecting the gastrointestinal tract, primarily resulting in bacillary dysentery. These diagnoses target the intestinal system and related complications such as dehydration or systemic spread. Accurate coding matters because it ensures complete clinical documentation and supports appropriate reimbursement for services related to infectious disease management.

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    When to Use

    Use a code from this group when a clinical diagnosis of shigellosis is documented or when laboratory testing confirms Shigella as the causative organism. Codes in this group are also used when coding encounters for complications directly attributable to the Shigella infection, such as dehydration or systemic involvement.

    ICD-10-CM Codes

    6 rows

    ICD-10-CM CodeDescription
    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

    DRG Codes

    3 rows

    DRG CodeDescription
    371Major Gastrointestinal Disorders and Peritoneal Infections with MCC
    372Major Gastrointestinal Disorders and Peritoneal Infections with CC
    373Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC

    Typical Clinical Scenarios

    • A previously healthy adult presents to the emergency department with sudden onset of high-volume bloody diarrhea, severe abdominal cramping, fever, and signs of systemic dehydration after recent travel and consumption of local street food. Stool culture or PCR confirms Shigella species as the causative organism, and the patient requires acute management for an invasive enteric infection. Typical codes: A03.0, A03.1
    • An elderly nursing home resident with baseline cognitive impairment develops a subacute course of watery diarrhea that progresses to febrile dysentery; the patient is unable to maintain oral intake and shows signs of volume depletion and electrolyte abnormalities, prompting hospital admission for IV fluids and close monitoring. Laboratory testing identifies Shigella, and the diagnosis characterizes an acute severe intestinal infection in a frail patient with increased risk of complications. Typical codes: A03.2, A03.3
    • A pediatric patient under five years old is seen in clinic for recurrent episodes of acute bloody diarrhea over several weeks; investigation reveals persistent Shigella infection with postinfectious reactive arthritis and weight loss, necessitating outpatient antimicrobial therapy and follow-up for complications. The encounter documents the ongoing intestinal infection and associated systemic complication related to the pathogen. Typical codes: A03.8, A03.9

    Related Codes

    A00-CHOLERA

    ICD-10-CM Code For Cholera: Group Overview

    A01-TYPHOID-AND-PARATYPHOID-FEVERS

    ICD-10-CM Code For Typhoid And Paratyphoid Fevers: Group Overview

    A02-OTHER-SALMONELLA-INFECTIONS

    ICD-10-CM Code For Other Salmonella Infections: Group Overview

    A04-OTHER-BACTERIAL-INTESTINAL-INFECTIONS

    ICD-10-CM Code For Other Bacterial Intestinal Infections: Group Overview

    A05-OTHER-BACTERIAL-FOODBORNE-INTOXICATIONS

    ICD-10-CM Code For Other Bacterial Foodborne Intoxications Not Elsewhere Classified: Group Overview

    A06-AMEBIASIS

    ICD-10-CM Code For Amebiasis: Group Overview

    A07-OTHER-PROTOZOAL-INTESTINAL-DISEASES

    ICD-10-CM Code For Other Protozoal Intestinal Diseases: Group Overview

    Coming soon

    A08-VIRAL-AND-OTHER-SPECIFIED-INTESTINAL-INFECTIONS

    ICD-10-CM Code For Viral And Other Specified Intestinal Infections: Group Overview

    A09-INFECTIOUS-GASTROENTERITIS-AND-COLITIS

    ICD-10-CM Code For Infectious Gastroenteritis And Colitis, Unspecified: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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