"An online tool ... which determines the 'hidden surcharge' or costs of a hospital's medical errors, employs a methodology that is 'seriously flawed,' says the American Hospital Association. The Leapfrog Group's new 'Hidden Surcharge Calculator,' a web-based tool, enables employers to add up how much of their health premium dollars go to manage hospital medical errors that harm their employees. The tool determines the costs based on the safety track records of each hospital where their workers received care."

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