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Data trove may shed light on health-care uncertainties
Washington Post

How much do hospitals and doctors actually charge insurers for their services? How much and which of those services are privately-insured patients using? And, most significantly, what drives changes in health-care use, costs, and total spending?

They are among the most vexing questions in American health care. And a recently amassed trove of data from insurance companies could soon shed new light on them.