ICD-10 Code A03.3 – Shigellosis due to Shigella sonnei (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A03.3 – Shigellosis due to Shigella sonnei
What it is
A03.3 identifies shigellosis caused by Shigella sonnei, a bacterial intestinal infection. Use it when documentation specifies this organism as the cause of the patient’s shigellosis.
Clinical signs
Typical findings include diarrhea, abdominal cramps, fever, and possible blood or mucus in stool. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents Shigella sonnei as the confirmed cause of shigellosis, including enteritis or dysentery due to this organism. It may also apply when the record clearly links the infection to S. sonnei. Check documentation if the species is not named.
Do not use for
Do not use A03.3 when another Shigella species is documented or when the record only says “shigellosis” without organism detail. Do not assume this code for nonspecific infectious diarrhea.
Coding tip
Confirm the organism name in the final provider documentation before assigning A03.3.