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ImportanceWasteful practices are widespread in the US health care system. It is unclear if payment models intended to improve health care efficiency, such as the Medicare accountable care organization (ACO) programs, discourage the provision of low-value services. ObjectiveTo assess whether the first year of the Medicare Pioneer ACO program was associated with a reduction in use of low-value services. Design, Setting, and ParticipantsIn a difference-in-differences analysis, we compared use of low-value services between Medicare fee-for-service beneficiaries attributed to health care provider groups that entered the Pioneer program (ACO group) and beneficiaries attributed to other health care providers (control group) before (2009-2011) vs after (2012) Pioneer ACO contracts began. Data analysis was conducted from December 1, 2014, to June 27, 2015. Comparisons were adjusted for beneficiaries’ sociodemographic and clinical characteristics as well as for geography. We decomposed estimates according to service characteristics (clinical category, price, and sensitivity to patient preferences) and compared estimates between subgroups of ACOs with higher vs lower baseline use of low-value services. Main Outcomes and MeasuresUse of, and spending on, 31 services in instances that provide minimal clinical benefit, measured as annual service counts per 100 beneficiaries and price-standardized annual service spending per 100 beneficiaries. ResultsDuring the precontract period, trends in the use of low-value services were similar for the ACO and control groups. The first year of ACO contracts was associated with a differential reduction (95% CI) of 0.8 low-value services per 100 beneficiaries for the ACO group (−1.2 to −0.4; P < .001), corresponding to a 1.9% differential reduction in service quantity (−2.9% to −0.9%) and a 4.5% differential reduction in spending on low-value services (−7.5% to −1.4%; P = .004). Differential reductions were similar for services less sensitive vs more sensitive to patient preferences and for higher- vs lower-priced services. The ACOs with higher than their markets’ mean baseline levels of low-value service use experienced greater service reductions (−1.2 services per 100 beneficiaries; −1.7 to −0.7; P < .001) than did ACOs with use below the mean (−0.2 services per 100 beneficiaries, −0.6 to −0.2; P = .41; P = .003 for test of difference between subgroups). Conclusions and RelevanceDuring its first year, the Pioneer ACO program was associated with modest reductions in low-value services, with greater reductions for organizations providing more low-value care. Accountable care organization–like risk contracts may be able to discourage use of low-value services even without specifying services to target.
JAMA Internal Medicine – American Medical Association
Published: Nov 1, 2015
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