America spends $3.3 trillion on health care, or more than $10,000 per person, which is twice as much as any other industrialized country. Yet nearly 30 million Americans, or 10% of the population, are uninsured. If the Affordable Care Act unravels in the near term, the number of insured could creep back up to 50 million, the level in 2009. These numbers exclude the millions more who are underinsured — people with high deductibles, high copays, and benefit caps that leave them very exposed if they fall seriously ill and are hospitalized.