And medical insurance doesn’t help much:

Medical bills are behind more than 60 percent of U.S. personal bankruptcies, U.S. researchers reported on Thursday in a report they said demonstrates that healthcare reform is on the wrong track.

More than 75 percent of these bankrupt families had health insurance but still were overwhelmed by their medical debts, the team at Harvard Law School, Harvard Medical School and Ohio University reported in the American Journal of Medicine.

“Unless you’re Warren Buffett, your family is just one serious illness away from bankruptcy,” Harvard’s Dr. David Himmelstein, an advocate for a single-payer health insurance program for the United States, said in a statement.

“For middle-class Americans, health insurance offers little protection,” he added.

The United States is embarking on an overhaul of its healthcare system, now a patchwork of public programs such as Medicare for the elderly and disabled and employer-sponsored health insurance that leaves 15 percent of the population with no coverage.

The researchers and some consumer advocates said the study showed the proposals under the most serious consideration are unlikely to help many Americans. They are pressing for a so-called single payer plan, in which one agency, usually the government, coordinates health coverage.

Most medical insurance only pays for a proportion of large medical bills, and has a cap on the total it will pay. You can get medical insurance that covers everything above a large deductible, but most people probably don’t know it exists, insurers don’t want to sell it, and many people probably couldn’t afford the deductible for small medical expenses.