For the 2020 Medicare Advantage plan year, a total of 14 organizations (up from seven the year before) are participating in the voluntary Medicare value-based insurance design (VBID) model. The number of beneficiaries enrolled in the plans participating in VBID has increased by 173%, from 440,000 to 1.2 million. The plans are available in 30 states and Puerto Rico. The plans participating in the VBID model can offer certain supplemental benefits to some members but not others. Normally, Medicare Advantage plans must offer all benefits to all members. Specifically, the VBID model waives the uniformity requirement for . . .