NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Calvin E. Luscombe

Boston University

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Institutional Affiliation: Boston University

NBER Working Papers and Publications

December 2017Open Enrollment Periods and Plan Choices
with Francesco Decarolis, Andrea Guglielmo: w24156
Open enrollment periods are pervasively used in insurance markets to limit adverse selection risks resulting when enrollees can switch plans at will. We exploit a change in the open enrollment rules of Medicare Advatage to analyze how beneficiaries responded to the option of switching to a 5-star rated plan at anytime, in a setting where insurers adjusted premiums and benefit design to counterbalance the increased selection risk. We present three findings: within-year switches to 5-star plans increase by 7-16%; demand for 5-star plans across the years does not change; the enrollees who switch to a 5-star plan during the year are in better health status than those who do not switch.
 
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