This interactive provides the facts on Medicare spending. Medicare, which serves 65 million people and accounts for 13 percent of the federal budget and 21 percent of national health spending, is often the focus of discussions about health expenditures, health care afforbability and the sustainability of federal health programs. <br><br>Explore data on enrollment growth, Medicare spending trends overall and per person, growth in Medicare spending relative to private insurance, spending on benefits and Medicare Advantage, Part A trust fund solvency challenges, and growth in out-of-pocket spending by beneficiaries.