Best Plan G Medicare Supplement Providers for 2025
UnitedHealthcare is the best Plan G Medicare Supplement (Medigap) provider of 2025, according to Investopedia research. Anthem and State Farm are two more excellent options. Plan G is the most popular Medigap plan, and the most comprehensive for people who turned 65 on or after Jan. 1, 2020 (which means they’re not eligible for the even more comprehensive Plan F). It covers most out-of-pocket costs associated with Original Medicare, except the Part B deductible.
To choose the best Plan G providers, Investopedia researched nine insurers, comparing their premiums, customer satisfaction records, and the number of plan types they sell, including Plan G, high-deductible Plan G, and high-deductible Plan F.
Best Plan G Medicare Supplement Providers for 2025
UnitedHealthcare
Why We Chose It
UnitedHealthcare has a lot to like for Plan G shoppers. The company charges competitive premiums, receives relatively few customer complaints, is financially strong, and sells Medigap plans in every state, a combination that made it our top pick. You'll need to be an AARP member, but that costs as little as $15.
Pros & Cons
Pros
Cons
Overview
AARP-branded Plan G policies from UnitedHealthcare have among the lowest premiums Investopedia found in our study of nine insurers. And the policies are issued by a financially strong company that you can count on to be in business for many years, which is important for Medigap enrollees because it’s often impossible to change Medigap plans outside of the first six months of your open enrollment.
UnitedHealthcare also has a good track record with customer satisfaction. Over a three-year period, state regulators received far fewer complaints about the company on average than expected for a company of its size. Also, UnitedHealthcare sells Medigap policies in every state and the District of Columbia, though it may not have Plan G policies in every location.
There are only a few drawbacks. While UnitedHealthcare does sell a high-deductible Plan G, its premiums for those plans are the highest Investopedia found out of all the providers we researched. And if you want a high-deductible Plan F instead, you will need to look elsewhere, since the company does not offer those plans. Finally, to buy a Medicare Supplement plan from UnitedHealthcare, you will need to be a member of AARP. The nonprofit organization advocates for issues related to people who are 50 and older, and membership can be as low as $15 the first year and $20 a year after that with automatic renewal.
UnitedHealthcare was founded in 1977 and is owned by UnitedHealth Group, a global health care and well-being company based in Eden Prairie, Minnesota.
Why We Chose It
Anthem Plan G premiums are the lowest Investopedia found among all the providers we researched. You could save even more through its household discount.
Pros & Cons
Pros
Cons
Overview
If you’re on a tight budget, Anthem might be ideal for you. The quotes we pulled for Plan G premiums were the lowest on average out of all the insurers we researched. They were about $100 less per month than the most expensive options. You could trim your premium by another 10% if someone else in your household also enrolls in a Medicare Supplement plan from Anthem. On top of that, our researchers found that calls to customer service were answered quickly—hold times were only about 30 seconds.
It's disappointing that this affordable Plan G policy isn’t more widely available. Anthem only sells it in 13 states. Another thing to keep in mind is that Anthem only offers Plans A, B, F, G, and N, and does not sell a high-deductible Plan G. If you’re not sure exactly which type of Medicare Supplement plan you want, you may want to consider another provider (at least until you decide).
Anthem is an independent licensee of Blue Cross Blue Shield and is owned by Elevance Health. Anthem is based in Indianapolis.
Aetna
Why We Chose It
Aetna charges the lowest premiums for high-deductible Plan G policies, and it sells Medicare Supplement policies throughout more than half the country.
Pros & Cons
Pros
Cons
Overview
Aetna’s average high-deductible Plan G premium is only $63 a month, which beats its competitors by $30-$76. It’s ideal for healthier applicants who want to save on premiums. In some states the company offers discounts for people who are spouses, domestic partners, or who have lived together for at least 12 months. Aetna also sells high-deductible Plan F policies for those who are eligible.
A high-deductible Plan G policy charges a much lower monthly premium than regular Plan G, but you must pay the first $2,870 of medical bills before the coverage kicks in. Standard Plan G policyholders only must pay the Plan B deductible of $257, but they pay higher premiums.
Ironically, Aetna’s Plan G premiums are the worst we found in our survey, so if you decide to go with a standard Plan G, consider Anthem or UnitedHealthcare instead.
Before enrolling with Aetna, be warned that its customer satisfaction record is poor. The company received far more customer complaints than expected for an insurer its size.
Aetnat was founded in 1853 and has its headquarters in Hartford, Connecticut.
State Farm
Why We Chose It
State Farm has the best complaint record of all the companies we surveyed, receiving far fewer complaints than expected for an insurer its size. That’s a good indicator that customers are largely satisfied.
Pros & Cons
Pros
Cons
Long hold times for customer service
Overview
Besides having an outstanding customer complaint record, State Farm also has an A++ financial stability rating from credit rating agency AM Best. It was the only insurer in our study with this top score, which means it has a superior ability to meet its future claims obligations. Importantly, State Farm has affordable Plan G premiums. Its average quote of $265 a month is among the best three we found.
Since State Farm is primarily a property and casualty insurer, it sells fewer Medigap plans than some competitors that specialize in health insurance. State Farm only sells six types of Medigap plans (A, C, D, F, G, N) and does not sell a high-deductible Plan G. State Farm also does not offer a household discount for Plan G policies.
State Farm was founded in 1922 and is based in Bloomington, Illinois.
Investopedia works for the consumer, not the insurance companies. Every product review we do starts with a rigorous research project led by staff editors and researchers. For this list of the best Plan G Medicare Supplement providers, we collected data points related to 20 criteria from nine companies.We used this data to review each company for financial stability, customer satisfaction, coverage options, cost, and other features.
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.
To identify which Medicare insurance companies to consider for this list, we reviewed research conducted by market intelligence and consulting firms, such as Kaiser Family Foundation (KFF), Chartis Group, and McKinsey. These reports provided 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 collected 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: 43%
- Financials: 20%
- Plan Types: 17%
- Customer Satisfaction: 15%
- Nationwide Availability: 5%
Read our full methodology for reviewing Medicare insurance providers.
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