Carrier of human T-lymphotropic virus type-1 infection

This code identifies an individual who harbors the human T-lymphotropic virus type-1 (HTLV-1) but does not currently exhibit active disease symptoms. These individuals are asymptomatic carriers, meaning they can transmit the virus to others even without showing signs of infection themselves. HTLV-1 is associated with adult T-cell leukemia/lymphoma and HTLV-1 associated myelopathy/tropical spastic paraparesis (HAM/TSP).

Use this code when documentation confirms a patient is a known carrier of HTLV-1, typically identified through serological testing, but is not experiencing any active HTLV-1 related illness. This applies to situations such as routine screening, follow-up for known carriers, or when a patient is identified as a carrier during contact tracing. It is appropriate when the patient's medical record explicitly states "HTLV-1 carrier" or similar.

• Do not use this code if the patient has active HTLV-1 related disease; instead, code the specific manifestation (e.g., adult T-cell leukemia/lymphoma, HAM/TSP).
• This code indicates carrier status only and should be sequenced as a secondary diagnosis if the primary reason for the encounter is unrelated to the carrier status.
• Ensure documentation clearly distinguishes between active infection and asymptomatic carrier status.