ICD-10 Code A25.0 – Spirillosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A25.0 – Spirillosis
What it is
A25.0 identifies spirillosis, a rare bacterial infection caused by Spirillum species. Use it when documentation specifically names spirillosis or spirillum infection.
Clinical signs
Clinical features vary; refer to documentation. Reported findings may include fever, local inflammation, and systemic symptoms after exposure associated with the infection.
When to use this code
Use A25.0 when the provider documents spirillosis as the confirmed diagnosis. It also fits encounters focused on evaluation or follow-up of a documented spirillum infection. If the record only says “bacterial infection” or is unclear, check documentation before coding.
Do not use for
Do not use this code for other rat-bite fever infections, nonspecific febrile illnesses, or unconfirmed suspected infections. Check documentation if the organism is not identified as Spirillum.
Coding tip
Code A25.0 only when the organism or diagnosis is clearly documented; otherwise, query the provider.