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Medicare Shared-Savings ACOs Cut $1 Billion in Costs Over Three Years Modern Healthcare by Shelby Livingston — Accountable care organizations (ACOs) participating in the Center for Medicare and Medicaid Services’ Medicare shared-savings program reduced spending by about $1 billion in three years, the Department of Health and Human Services' Office of Inspector General (OIG) reported Tuesday. Most of the 428 ACOs in the first three years of the shared-savings program reduced Medicare spending compared to their benchmarks, and a small group of those ACOs produced "substantial" savings. The majority of the ACOs—82 percent—also improved the quality of care they provided, based on data from the CMS on 33 individual quality measures. They outperformed fee-for-service providers in 81 percent of the quality measures.