Private Medicare Advantage plans, already targeted for cuts by the Obama administration, are under more pressure in Congress. The latest critique comes from Glenn Hackbarth, chairman of MedPac, a commission created by Congress to advise lawmakers on Medicare. In testimony for the health subcommittee of the House Ways & Means Committee, Hackbarth said the private plans offer patients enhanced benefits, but those benefits aren't being paid for by the efficiencies of the private market. Instead, they come at a "high cost," Hackbarth said.