"A coalition of some of the nation's largest health care systems and insurers vowed on Wednesday to change the way hospitals and doctors are paid -- placing less emphasis on the sheer amount of care being delivered and more on improving quality and lowering costs.... The private coalition includes, among others, Partners HealthCare, the powerful Boston health system that oversees Brigham and Women's and Massachusetts General hospitals; Ascension, the nation's largest Catholic and nonprofit health system; Aetna, a national for-profit insurer; and Health Care Service Corporation, which operates five state Blue Cross plans."

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