ICD-10 Code B97.39 – Other retrovirus as the cause of diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B97.39 – Other retrovirus as the cause of diseases classified elsewhere
What it is
This code identifies a retrovirus documented as the cause of another condition classified elsewhere. Use it when the virus is named, but the main diagnosis is coded to the associated disease.
Clinical signs
Clinical features vary; refer to documentation. The record should show a retroviral infection or exposure linked to a separate condition, with the causal relationship clearly stated by the provider.
When to use this code
Use B97.39 when the clinician documents an other retrovirus as the cause of a disease that is coded elsewhere, such as a manifestation or secondary condition. Pair it with the code for the actual illness, not as a stand-alone diagnosis. Check documentation if the specific retrovirus is not identified.
Do not use for
Do not use this code for unspecified viral illness or when the retrovirus is not documented as causal. Do not use it if another more specific infectious agent code applies.
Coding tip
Code the underlying condition first, then add B97.39 only when the provider clearly links the retrovirus to that diagnosis.