ICD-10 Code A03 – Shigellosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A03 – Shigellosis
What it is
A03 identifies shigellosis, an intestinal infection caused by Shigella species. Use it when the record documents this bacterial dysentery or a confirmed Shigella infection.
Clinical signs
Typical features include diarrhea, abdominal cramps, fever, and sometimes blood or mucus in stool. Clinical features vary; refer to documentation.
When to use this code
Use A03 when the clinician documents shigellosis, Shigella enteritis, or bacillary dysentery. Apply it for confirmed infection, or when the assessment clearly states Shigella as the cause of the gastrointestinal illness. Check documentation if the organism is not named.
Do not use for
Do not use A03 for nonspecific diarrhea, gastroenteritis, or colitis without documented Shigella infection. If another pathogen is identified, code that condition instead.
Coding tip
Look for the specific organism name and any documented complications before assigning A03.