Consumer information and biased selection in the demand for coverage supplementing Medicare

Area of Science:

• Health Economics
• Public Health Policy
• Consumer Behavior

Background:

• Medicare beneficiaries choose between basic coverage, Medigap policies, or Health Maintenance Organizations (HMOs).
• Understanding how health insurance knowledge and health status influence these choices is crucial for policy.
• Existing models often overlook the interaction between consumer knowledge and health status in plan selection.

Purpose of the Study:

• To examine the interplay between health insurance knowledge and consumer health status in Medicare coverage decisions.
• To analyze how these factors influence the choice between basic Medicare, Medigap, and HMO plans.
• To inform policy regarding risk adjustment in capitated payment formulas.

Main Methods:

• Utilized a unique dataset of Medicare beneficiaries with information on coverage knowledge, perceived health status, and insurance choices.
• Employed a multinomial logistic model to estimate the determinants of insurance plan selection.
• Focused on beneficiaries who participated in an educational workshop on insurance options.

Main Results:

• Health insurance knowledge has a differential impact on coverage choices based on health status.
• Highly knowledgeable, sicker beneficiaries are less likely to choose basic Medicare alone.
• Highly knowledgeable, healthier beneficiaries are less likely to enroll in HMOs compared to Medigap.

Conclusions:

• Consumer knowledge and health status significantly interact to shape health insurance purchasing decisions.
• High levels of coverage knowledge can exacerbate selection bias in Medicare Advantage plans without proper risk adjustment.
• Findings have implications for designing equitable payment formulas for Health Maintenance Organizations (HMOs).