The Impact of Organizational Boundaries on Health Care Coordination and Utilization
研究了患者医疗在不同组织间的分散程度如何影响医疗效率，发现当患者转向组织集中度更高的初级保健医生时，医疗利用率下降21%，且糖尿病护理改善，急诊和住院使用未增加。
-the distribution of a patient's healthcare across organizations-to examine how firm boundaries affect healthcare efficiency. First, when patients move to regions where outpatient visits are typically concentrated within a small set of firms, their healthcare utilization falls. Second, for patients whose PCPs exit the market, switching to a PCP with 1 standard deviation higher organizational concentration reduces utilization by 21%. This finding is robust to controlling for the spread of healthcare across providers. Increases in organizational concentration predict improvements in diabetes care and are not associated with greater use of emergency department or inpatient care.