Nearly half of insured Americans get surprise expenses in medical bills, survey finds.

Nearly half of Americans with health insurance said they received a recent medical bill or a charge that "should have been free or covered by their insurance," according to a survey released Thursday.

The survey, from the Commonwealth Fund in New York City, found 45% of working-age consumers last year were erroneously billed, however, fewer than half of those patients challenged their health insurance company or a medical provider about the unexpected charges.

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