Overuse of health care, or providing services of low value or no value, is wasteful, potentially harmful to patients, and a contributor to high US health care costs. Jodi Segal, MD, of the Johns Hopkins University School of Medicine joins JAMA Health Forum Editor John Ayanian and Deputy Editor Melinda Buntin to discuss characteristics of health systems associated with overuse of health care services for Medicare beneficiaries and the implications for health systems, hospitals, and clinicians seeking to reduce such overuse.

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