Oth retrovirus as the cause of diseases classified elsewhere

This code identifies the presence of a retrovirus, other than HIV, that is responsible for causing a disease classified under a different ICD-10-CM code. It signifies a causal link where the retroviral infection is the underlying etiology of another manifest condition.

Use this code when documentation explicitly states a retrovirus (excluding HIV) as the causative agent for a condition like certain lymphomas, leukemias, or neurological disorders, where the primary disease is coded elsewhere. Supporting documentation should clearly link the retroviral infection to the specific disease.

• Always sequence this code as a secondary diagnosis, following the code for the specific disease caused by the retrovirus.
• Ensure the medical record specifies a retrovirus other than HIV; otherwise, consider codes from Chapter 1 (Certain infectious and parasitic diseases) for HIV.
• Do not use this code if the retrovirus is merely present but not identified as the cause of a classified disease.