WASHINGTON, Aug. 18 - In a significant policy changes, Bush Administration Officials say that Medicare will no longer pay the extra costs of treating preventable errors, injuries and infections that occur in hospitals, a move they say could save lives and millions of dollars.

Private insurers are considering similar changes, which they said could multiply the savings band benefits for patients.

Under the new rules, to be published next week, Medicare will not pay hospitals for the costs of treating certain "conditions that could reasonably have been prevented."

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