In just three years, a new way of paying for medical care has spread rapidly across Massachusetts, and now more than 1.2 million people are covered by plans that put providers on a budget in an effort to restrain health spending. This means that about one in five Massachusetts residents are being treated by providers working under these new cost-conscious arrangements, a Globe survey of insurers found - even before state lawmakers begin debating legislation to address soaring health insurance premiums.
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