By: Austin Frakt  

The Medicare Advantage program was supposed to save taxpayers money by allowing insurers to offer older Americans private alternatives to Medicare. The plans now cover 19 million people, a third of all those who qualify for Medicare. Enrollee satisfaction is generally high, and studies show that plans offer higher quality than traditional Medicare. But the government pays insurers more than they pay out for patient care — in some years, it turns out, a great deal more.

Concern about Medicare Advantage's cost has found sharp expression in a recent suit brought by the Justice Department charging UnitedHealth with excessive billing of the government. While that suit plays out, research published by the National Bureau of Economic Research provides context.

The study, released in January, found that the revenue Medicare Advantage plans received in 2010 exceeded the amount they paid out for medical care by a hefty 30 percent. At more than $2,000 per enrollee per year, that probably topped $20 billion dollars, nearly all from federal payments, not enrollee premiums. The study relied on Medicare Advantage billing data obtained from three large insurers across 36 states, a type of data the government doesn't yet release.