Supplementing gatekeeping with a revenue scheme for secondary care providers.

We study implications of a change in the payment scheme for radiology providers in Norway that was implemented in 2008. The change implies reduced fee-for-service and increased fixed budget for a contracted volume of services. A consequence of the change is that private providers have less incentive to conduct examinations beyond the contracted volume. Different from the situation observed before the change in 2008, the volume is no longer determined by the demand side, and a rationing of the supply occurs. We employ data on radiological examinations initiated by GPs' referrals. We apply monthly data at the physician-practice level for 2007-2010. The data set is unique because it includes information about all GPs in the Norwegian patient-list system. The results indicate that private providers conducted fewer examinations in 2008-2010 compared with previous periods and that public hospitals did either the same volume or more. We find that GPs who operate in a more competitive environment experienced a greater reduction in magnetic resonance imaging, both performed by private providers and in total for their patients. We argue that this result supports a hypothesis that patients with lower expected benefits are rationed. Hence, rationing from the supply side might supplement GP gatekeeping.