Exploring variations in health-care expenditures-What is the role of practice styles?

Variations in medical resource usage, both across and within geographical regions, have been widely documented. In this paper, we explore physician practice styles as a possible determinant of these variations. In particular, we exploit patient mobility between physicians to identify practice styles among general practitioners (GPs) in Austria. We use a large administrative data set containing detailed information on a battery of different health-care services and implement a model with additive patient and GP fixed effects that allows flexibly for systematic differences in patients' health states. We find that, although GPs explain only a small part of the overall variation in medical expenses, heterogeneities in spending patterns among GPs are substantial. Conditional on patient characteristics, we document a difference of € 751.47 per patient per year in total medical expenses (which amounts to roughly 45% of the sample mean) between high- and low-spending GPs.