The most recent KFF Health Tracking Poll finds majorities across partisans think taxes for most people would increase under a national health plan, sometimes called Medicare-for-all (78 percent), and about half (53 percent) think private health insurance companies would no longer be the primary way Americans would get health coverage under such a plan.

People new to Medicare can receive their Medicare benefits through either traditional Medicare or private plans, such as HMOs or PPOs, known as Medicare Advantage plans. Older adults and younger beneficiaries with disabilities have said that they make this choice based on premiums and out-of-pocket costs, access to desired providers, the reputation of the company offering the plan, ads and other marketing materials, and the advice of brokers, family members and friends.

People who switched from traditional Medicare to private Medicare Advantage plans in 2016 spent $1,253 less in 2015, on average, than beneficiaries who remained in traditional Medicare, after adjusting for health risk. Even among traditional Medicare beneficiaries with specific health conditions, those who shifted to Medicare Advantage in 2016 had lower average spending in 2015, including people with diabetes ($1,072), asthma ($1,410), and breast or prostate cancer ($1,517).