Best Medicare Supplement (Medigap) Insurance

Why Trust Us

Investopedia staff conducted weeks of extensive research and analysis to determine the best Medicare Supplement insurance providers. We collected almost 200 data points related to cost, product offerings, customer satisfaction, and more to create unbiased evaluations of nine insurers. 

Investopedia has been a trustworthy source of financial information since 1999, and has years of experience bringing readers objective, data-driven reviews of financial products and services.

How We Chose the Best Medicare Supplement Insurance (Medigap) Companies

To create this list of the best Medigap companies, Investopedia staff researchers first identified which providers to include in our survey. We consulted research from market intelligence and consulting firms, such as Kaiser Family Foundation (KFF), Chartis Group, and McKinsey. These sources gave us insight into individual market share, enrollment growth, and nationwide availability for major Medicare providers in the United States. We used this information to narrow our focus to nine Medigap companies that met our baseline standards for availability, financial strength, and customer satisfaction.

For each of these companies, we looked at data from organizations such as the credit rating agency AM Best and the National Association of Insurance Commissioners (NAIC). The NAIC collects customer complaints made to state regulators about insurance companies and presents the information in a complaint index, which reflects the number of complaints made relative to the company’s size. 

We also mined data from government databases provided by the Centers for Medicare and Medicaid Services (CMS), as well as from insurer websites, media representatives, and Investopedia business partners. Data collection occurred between Aug. 27 and Oct. 10, 2024.

We then fed that data into a quantitative model we developed that scored each Medigap company based on criteria our experts deemed most important when choosing an insurance provider. The criteria were weighted as follows, in broad terms:

• Costs: 38%
• Financials: 30%
• Plan Types: 17%
• Customer Satisfaction: 10%
• Nationwide Availability: 5%

Read our full methodology for reviewing Medicare insurance providers.