Some people might want to go back to a traditional Medicare plan versus the Advantage plan that works like a managed-care plan.

FORBES: What should I do to change my Medicare Advantage plan before time runs out February 14?

One managed-care plan in New Jersey spent only 59% of its premium dollars on care, while some California for-profit HMOs pay out as much as 88%.

CNN: Backlash Against HMOs

The new Medicare prescription drug plan may cut retail margins, but Walgreen offsets that by snagging the contract to sell Medicare prescriptions to managed-care giant UnitedHealth Group's plan.

FORBES: Drugstore Cowboy

So much so, that according to this Bloomberg report, UnitedHealth, Wellpoint, Aetna and some of the other big managed care companies have been secretly meeting to plan the firing of their lobbyist Karen Ignagni.

FORBES: HMO Whistleblowers Proliferate: Are They Sincere?

The core of the Republican Medicare cost-reduction bill is Medicare Plus, a plan offering seniors a range of managed care plans, or HMO's, from which to choose.

CNN: Republican Medicare plan short on detail

Medtronic, a medical-device maker, began offering its employees this sort of plan, along with more conventional managed-care coverage, last year.

ECONOMIST: Corporate health plans