The Impact of Health Insurance Expansion on Physician Treatment Choice: Medicare Part D and Physician Prescribing
We test the effect of the introduction of Medicare Part D on physician prescribing behavior by using data on physician visits from the National Ambulatory Medical Care Survey (NAMCS) 2002-2004 and 2006-2009 for patients aged 60-69. We use a combined DD-RD specification that is an improvement over either the difference-in-difference (DD) or regression discontinuity (RD) designs. Comparing the discrete jump in outcomes at age 65 before and after 2006, we find a 35% increase in the number of prescription drugs prescribed or continued per visit and a 55% increase in the number of generic drugs prescribed or continued, providing evidence of physician response to changes in patient out-of-pocket costs.
We thank Mary E. Deily and participants at the 2012 Eastern Economic Association Annual Meeting, 2012 American Society of Health Economists Conference, and seminars at Harvard University, University of Pennsylvania, the Johns Hopkins University and the National Center for Health Statistics, CDC. The findings and conclusions in this article are those of the authors and do not necessarily represent the views of the Centers for Disease Control and Prevention and the National Bureau of Economic Research.
Tianyan Hu & Sandra L. Decker & Shin-Yi Chou, 2017. "The impact of health insurance expansion on physician treatment choice: Medicare Part D and physician prescribing," International Journal of Health Economics and Management, vol 17(3), pages 333-358.