ICD-10 Code A04 – Other bacterial intestinal infections (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A04 – Other bacterial intestinal infections
What it is
A04 covers bacterial intestinal infections that are not classified elsewhere. Use it for infectious diarrhea or enteritis when the organism is bacterial but the record does not support a more specific code.
Clinical signs
Typical findings include diarrhea, abdominal cramping, nausea, vomiting, and sometimes fever. Clinical features vary; refer to documentation and the identified organism when available.
When to use this code
Use A04 when the provider documents a bacterial intestinal infection without a more specific ICD-10-CM option. It may apply when the chart notes bacterial gastroenteritis, enteritis, or infectious diarrhea and no exact pathogen is named.
If documentation identifies a specific bacterium, code that organism instead when a more specific code exists. Check documentation for whether the condition is acute, confirmed, or only suspected.
Do not use for
Do not use A04 for viral, parasitic, or noninfectious gastrointestinal disorders. Also avoid it when the record clearly supports a more specific organism code.
Coding tip
Code the documented organism first when the chart names one; otherwise, use A04 only when the infection is clearly bacterial but nonspecific.