"The Port Authority has advised that retirees do not need to enroll in any of the Medicare Part D prescription drug plans offered by insurance carriers or others, unless you believe that plan would be more beneficial to you.  Port Authority/PATH retirees and their Medicare-eligible spouses/dependents are automatically covered by the Port Authority's Prescription Drug Plan, an employer-sponsored Medicare Part D plan (currently administered by Express Scripts).  The Centers for Medicare & Medicaid Services (CMS) has determined that the Port Authority plan provides coverage that is better than the standard Medicare Part D plan."   Additionally, Part B is mandatory for PA benefits to work properly.