HCPCS Level II code L5671 describes an addition to a lower extremity prosthesis (below-knee or above-knee) that provides a suspension locking mechanism such as a shuttle or lanyard, and explicitly excludes the socket insert; this is a durable medical equipment/prosthetic component typically billed as a prosthetic accessory for prosthetic lower limb fittings and is commonly provided in prosthetics clinics or orthotics & prosthetics laboratories/office settings.

For related coverage guidance, see recent payer policy updates: Clinical Review Criteria — Lymphedema Therapy and Training (Complete Decongestive Therapy; LVA), Therapy Services — Electric Stimulation for Pain, Swelling and Function in a Clinic Setting, Site of Care: Outpatient Hospital Setting for Physical and Occupational Therapy.