Medicare Advantage Plans

Beneficiaries choose from an average of 35 private Medicare Advantage plans in each county, Mr. Zarabozo and Mr. Harrison report. But they say, “Payment increases have been so large that plans no longer need to be efficient to offer extra benefits.”

Payments to health maintenance organizations are, on average, 12 percent higher than what the government would spend for beneficiaries in traditional Medicare, they write, while payments to private fee-for-service plans were 17 percent higher.

Insurance company executives and Bush administration officials defend the role of private plans.

“Medicare Advantage plans are offering an average of over $1,100 in additional annual value to enrollees in terms of cost savings and added benefits,” said Kerry N. Weems, the acting administrator of the Centers for Medicare and Medicaid Services.

Karen M. Ignagni, president of America’s Health Insurance Plans, a trade group, said two types of plans — H.M.O.’s and preferred provider organizations — had produced tangible benefits by coordinating care. As a result, she said, disease is detected earlier and people have fewer visits to hospital emergency rooms.

But, Ms. Gold said, “these are not the types of plans that have been growing most rapidly.” Instead, the private fee-for-service plans are growing fastest, and they, she said, “are not set up to coordinate care.”

The Medicare Payment Advisory Commission has said the payments to private plans should gradually be reduced to the level of traditional Medicare.

In a campaign statement, Mr. Obama declared, “We need to eliminate the excessive subsidies to Medicare Advantage plans and pay them the same amount it would cost to treat the same patients under regular Medicare.” In a debate on Oct. 15, Mr. Obama described the subsidies as “just a giveaway” to private insurers.

Similar views have been expressed