ICD-10 Code A28 – Other zoonotic bacterial diseases, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A28 – Other zoonotic bacterial diseases, not elsewhere classified
What it is
This code covers zoonotic bacterial infections that are not classified elsewhere. Use it when the organism is linked to animals or animal exposure, but the diagnosis does not fit a more specific ICD-10 category.
Clinical signs
Clinical features vary; refer to documentation. You may see a bacterial illness after animal contact, with findings consistent with the documented zoonotic infection, but the exact presentation depends on the specific organism and site involved.
When to use this code
Use A28 when the provider documents an other zoonotic bacterial disease and no more specific code applies. It is appropriate for confirmed or clinically diagnosed zoonotic bacterial infections that are not indexed elsewhere. Check documentation for the named organism and exposure history.
Do not use for
Do not use this code when the infection has a more specific ICD-10 code, including a named zoonotic bacterial disease. Do not use it for nonbacterial infections or for vague animal exposure without a documented diagnosis.
Coding tip
Look for the exact organism or provider wording first; if a specific zoonotic diagnosis is documented, code that instead of A28.