"[T]he Announcement outlines payment and risk adjustment methodology changes that will impact payments for MA (Part C) and Part D plans and the retiree drug program benefit parameters in the 2016 contract (calendar) year. The Call Letter describes policy modifications and other considerations for plan sponsors preparing bids for the 2016 contract (calendar) year.... These changes will affect a wide range of stakeholders, including MA and Part D plan sponsors, participating providers, pharmacy benefit managers, pharmacies, drug manufacturers, and the vendors that provide services and products to these segments of the health care industry."