According to the Centers for Medicare & Medicaid Services (CMS), Medicare Advantage plans are expected to decline by 11% in 2020 to $21 (from $23.63 in 2020). About 42% of Medicare participants are expected to enroll in the plans, as many of those have added new services. There are also a wide array of plans available, 47 in 2020 compared to just 39 in 2020.