Unsp retrovirus as the cause of diseases classd elswhr

This code indicates that an unspecified retrovirus is identified as the underlying cause of another disease, which is classified elsewhere in the ICD-10-CM system. It signifies a causal link between a retroviral infection and a separate, manifest condition, without specifying the exact retrovirus involved.

Use this code when documentation clearly states a retroviral etiology for a co-occurring condition, but the specific type of retrovirus (e.g., HIV, HTLV) is not identified. This code should always be sequenced as a secondary diagnosis, following the code for the primary disease caused by the retrovirus.

• Always sequence this code after the code for the disease it is causing.
• Avoid using this code if a more specific retrovirus (e.g., HIV, HTLV) is documented; instead, use the appropriate B20 or B97.3- subcategory.
• Ensure documentation explicitly links the retrovirus to the other disease; do not assume causality.