Health insurance in the U.S. is expensive, costing the average American $8,951 a year, with a family spending $25,572. You'd think this investment in health coverage would pay off. And yet annually 530,000 Americans file for bankruptcy due to unpaid medical bills, with another 59 percent of filers blaming medical costs as a factor. But here's the shocker: Of those numbers, studies show that 79 percent of these filers had health insurance coverage while they were racking up those extraordinary medical bills.