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Managed care spillover effects.

In addition to influencing care for patients enrolled in managed care plans, growth in managed care could lead to broad changes in the structure and functioning of the health care system that could ultimately influence care for all patients, even those not covered by managed care plans. This paper summarizes the mechanisms by which these effects could arise, including shifts in the types of services available in markets and changes in physician practice patterns. The paper summarizes available empirical evidence on broad-level effects of managed care, concluding that the literature supports the view that managed care can have generalized effects on health care spending, utilization patterns, and infrastructure, although existing literature has not clearly identified effects on health outcomes.