Arrangement means a written agreement between an HMO or CMP and another entity, under which -
(1) The other entity agrees to furnish specified services to the HMO's or CMP's Medicare enrollees;
(2) The HMO or CMP retains responsibility for the services; and
(3) Medicare payment to the HMO or CMP discharges the beneficiary's obligation to pay for the services.
42 CFR § 417.401
As used in this subpart and subparts K through R of this part, unless the context indicates otherwise -