New risk-adjustment system was associated with reduced favorable selection in medicare advantage

Area of Science:

• Health Services Research
• Health Economics
• Public Health Policy

Background:

• Medicare Advantage (MA) plans historically enrolled healthier individuals than traditional fee-for-service Medicare.
• This favorable risk selection led to financial overpayments for MA plans due to inadequate risk adjustment.
• Reforms, including a new risk-adjustment system (2004-2007) and a disenrollment lock-in provision, were introduced to mitigate this issue.

Purpose of the Study:

• To evaluate the impact of recent reforms on risk selection in Medicare Advantage.
• To determine if changes in payment and enrollment policies reduced the tendency for MA plans to attract healthier enrollees.

Main Methods:

• Comparative analysis of Medicare Advantage and traditional Medicare beneficiaries.
• Examined differences in self-reported health care use and health status.
• Compared beneficiaries before (2001-2003) and after (2006-2007) the implementation of reforms, including switchers and non-switchers.

Main Results:

• Significant narrowing of differences in health care use and health status between MA and traditional Medicare beneficiaries post-reforms.
• Observed reductions in selection disparities among enrollees who switched into or out of MA plans compared to non-switchers.
• Findings suggest the reforms were associated with a reduction in favorable risk selection.

Conclusions:

• The implemented risk-adjustment system and lock-in provision appear effective in reducing financial incentives for risk selection in Medicare Advantage.
• These findings have implications for the design of competing health insurance marketplaces and accountable care organizations.
• Similar risk-adjustment strategies may be beneficial in other value-based healthcare models to ensure equitable patient enrollment.