VOLUME 54 | NUMBER 5 | OCTOBER 2019
The effects of plan payment rates on the market for Medicare Advantage Dual-Eligible Special Needs Plans
Objective: To determine the effect of higher potential benchmark payment rates on the market for Medicare Advantage (MA) DualEligible Special Needs Plans (DSNPs).
Data Sources/Study Setting: Publicly available countylevel data from 2009 to 2015 regarding the number of DSNPs operating within the county, the enrollment in and fivestar quality of score of these plans, and the benchmark amounts used to determine capitated plan payments.
Study Design: This study exploits the introduction of quality bonus payments to the MA program in 2012, and exogenous geographic variation in the potential size of these bonuses to estimate the effect of benchmark payment increases on the availability, quality, and takeup of DSNPs. We use a differenceindifference estimation approach to compare changes in the market for DSNPs in counties eligible for a double bonus to those that are not.
Principal Findings: The doubling of bonuses was associated with a relative 29 percent increase in the number of DSNPs offered (P = 0.021) and 0.1star increase in the average quality of available DSNPs (P = 0.034). No relative increase in overall DSNP enrollment was detected.
Conclusions: These findings indicate that larger benchmark payment amounts may influence insurers’ decisions of whether to participate in the DSNP market but not dualeligibles' decision of whether to enroll in these plans. Future research is needed to inform discussions about whether DSNPs are a viable mechanism for integrating benefits for dual eligibles and the degree to which Medicare policies should support their continued growth.
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