Research report. Enrolment procedures and self-selection by patients: evidence from a Polish family practice

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Abstract
This paper examines the consequences of patient enrolment procedures in a capitation-based family practice in Krakow (Poland), where the local city government used two different methods for preparation of patient lists. In the first, the city gave the individuals living within the practice area the option of withdrawing from being enrolled in the practice; in the second, individuals were given the option of enrolling in the practice. These two enrolment procedures, identified as ‘active-negative’ and ‘active-positive’ respectively, provide a natural experiment for investigating the effects of an enrolment methodology on the economics of a physician's practice. An examination of the data indicates that self-selecting enrolees utilize significantly greater quantities of health care compared to others, and university educated individuals and individuals more likely to fall ill are more likely to self-select into a practice. The study suggests that in order to reduce demand-side adverse selection, either the system of active-positive enrolment should be modified, or capitation rates should be risk-adjusted by health status rather than by demographic variables only. The policy implications of this study become even more significant as more and more physicians leave their salaried jobs to start state-financed independent practices.

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