ICD-10 Code B97.5 – Reovirus as the cause of diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B97.5 – Reovirus as the cause of diseases classified elsewhere
What it is
This code identifies reovirus as the infectious agent causing a condition classified elsewhere. Use it when the record names reovirus as the cause, but the main diagnosis is coded in another category.
Clinical signs
Clinical features vary; refer to documentation. Reovirus infection may be noted through virologic evidence or a clinician’s statement linking the virus to the patient’s illness.
When to use this code
Use B97.5 when the provider documents reovirus as the cause of another coded disease or disorder. Pair it with the underlying manifestation code, since this code does not stand alone as the principal diagnosis. Check documentation if the chart only says “viral infection” without naming reovirus.
Do not use for
Do not use this code for an unspecified viral illness or when reovirus is not identified. Do not assign it as the only diagnosis if another condition explains the encounter.
Coding tip
Code the underlying condition first, then add B97.5 only when reovirus is clearly documented as the cause.