ICD-10 Code B97.30 – Unspecified retrovirus as the cause of diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B97.30 – Unspecified retrovirus as the cause of diseases classified elsewhere
What it is
This code identifies an unspecified retrovirus documented as the cause of another disease. Use it when the provider links a retroviral infection to a separate condition, but does not name the exact virus.
Clinical signs
Clinical features vary; refer to documentation. You may see evidence of a retroviral infection being noted alongside another diagnosed condition, but the specific organism is not identified in the record.
When to use this code
Use B97.30 when the chart states that an unspecified retrovirus is the cause of a disease classified elsewhere. It is an additional cause code, so you should pair it with the manifestation or related condition being treated. Check documentation if the provider only suspects a viral cause.
Do not use for
Do not use this code when a specific retrovirus is named, or when no causal link to another disease is documented. It is also wrong for general viral illness without a linked condition.
Coding tip
Code the underlying condition first, then add B97.30 only when the provider clearly documents causation.