Source: Mary K. Catlin, John A. Poisal and Cathy A. Cowan, Health Affairs, Vol. 34 no. 1, January 2015
From the abstract:
Out-of-pocket health care spending in the United States totaled $306.2 billion in 2010 and represented 11.8 percent of total national health expenditures, according to the Centers for Medicare and Medicaid Services’ National Health Expenditure Accounts. Spending by people with employer-sponsored health insurance and those covered by Medicare accounted for over 80 percent of total out-of-pocket spending. People without comprehensive medical coverage accounted for less than 8 percent of all out-of-pocket expenditures in 2010. Between 2007 and 2010 per person out-of-pocket spending grew most rapidly for people primarily covered by employer-sponsored insurance and declined for people primarily covered by Medicare and those without coverage.