More than half of the accountable care organizations in the Medicare Shared Savings Program reduced Medicare spending and nearly all of them scored at least 94 percent on quality measures, according to a Premier analysis of results CMS released Monday (Oct. 30). Also, physician-only ACOs continue to outperform ACOs that include hospitals, according to CMS . Earlier this month, CMS disclosed the overall amount that ACOs saved Medicare among ACO initiatives. ACOs across the Medicare Shared Savings Program and three...