The main purpose of this legislation is to strengthen protections for patients with end-stage renal disease (ESRD) under the Medicare Secondary Payer Act. It aims to ensure that private health insurance plans do not discriminate against these patients, particularly regarding coverage for dialysis services, and to prevent these plans from unfairly shifting the financial responsibility for their care to Medicare. Key provisions of the legislation include a clear prohibition against health insurance plans treating dialysis services differently from other medical services.