wow, I can't believe nobody had anything to say about this one.
Let me help out... Here's a bit of the article:
Many advocates of a public health plan--either a "single-payer" plan or a "public option"--claim that a public health plan will save money compared to private health insurance because "everyone knows" that the largest government health program, Medicare, has lower administrative costs than private insurance. Some even claim that switching every private insured American to Medicare or something like it could save the nation enough money to cover all currently uninsured Americans.
Advocates of a public plan assert that Medicare has administrative costs of 3 percent (or 6 to 8 percent if support from other government agencies is included), compared to 14 to 22 percent for private employer-sponsored health insurance (depending on which study is cited), or even more for individually purchased insurance. They attribute the difference to superior efficiency of government,[1] private insurance companies' expenditures on marketing,[2] efforts to deny claims,[3] unrestrained pursuit of profit,[4] and high executive salaries.[5]
However, on a per-person basis Medicare's administrative costs are actually higher than those of private insurance--this despite the fact that private insurance companies do incur several categories of costs that do not apply to Medicare. If recent cost history is any guide, switching the more than 200 million Americans with private insurance to a public plan will not save money but will actually increase health care administrative costs by several billion dollars.
Fuzzy Math
Medicare patients are by definition elderly, disabled, or patients with end-stage renal disease, and as such have higher average patient care costs, so expressing administrative costs as a percentage of total costs gives a misleading picture of relative efficiency. Administrative costs are incurred primarily on a fixed or per-beneficiary basis; this approach spreads Medicare's costs over a larger base of patient care cost.