Technological Change and Risk Adjustment: Benefit Design Incentives in Medicare Part D

Area of Science:

• Health Economics
• Pharmaceutical Policy
• Health Insurance Markets

Background:

• Subsidized health insurance markets utilize diagnosis-based risk adjustment to ensure equitable benefits for individuals with diverse healthcare costs.
• Technological changes, such as new drug approvals and generic competition, can significantly impact the profitability of specific medical diagnoses over time.

Purpose of the Study:

• To investigate how technological advancements affect diagnosis profitability within Medicare Part D.
• To determine if insurers adjust their benefit designs in response to changes in diagnosis profitability.
• To assess the effectiveness of risk adjustment in mitigating insurer incentives for selective enrollment in the presence of technological change.

Main Methods:

• The study analyzes data from Medicare Part D, focusing on the period after risk adjustment calibration.
• It examines the impact of new drug entry and generic competition on the profitability of specific diagnoses.
• Exploits variations in diagnosis profitability driven by technological change to analyze insurer benefit design strategies.

Main Results:

• Technological change, including new drug entry and generic competition, altered the profitability of certain diagnoses in Medicare Part D.
• Insurers designed more favorable benefits for drugs treating profitable diagnoses compared to unprofitable ones.
• These findings suggest that risk adjustment may not fully neutralize insurers' incentives to influence enrollment through benefit design when technological change is present.

Conclusions:

• Technological advancements can create profitable and unprofitable diagnoses, influencing insurer behavior in Medicare Part D.
• Benefit design strategies by insurers can be skewed towards more profitable diagnoses, even with risk adjustment.
• Risk adjustment mechanisms may require recalibration or complementary policies to fully address insurer selection incentives in dynamic markets.