Managed Care and Health Care Utilization: Specification of Bivariate Models Using Copulas

Abstract

This article studies the effect of managed care on health care utilization compared to traditional fee-for-service plans in private health insurance market. To construct our hypothesis, we build a game-theoretic model to study health care utilization under a two-sided moral hazard: of patients and providers. In econometric modeling, we employ a copula regression to jointly examine individuals’ health plan choice and their utilization of medical care services, because of the endogeneity of insurance choice. The dependence parameter in the copula reflects the relation between the two outcomes, based on which the average treatment effects are further derived. We apply the methodology to a survey data set of the U.S. population and consider three types of curative care and three types of preventive care for the measurement of medical care utilization. We find that managed care is in general associated with higher care utilization. Evidence is also found on the underlying incentives of both patients and medical providers.