How to compare Medigap Plan G insurers

Start with the same version of Plan G, then compare the insurer’s price and service. A familiar company name is not enough to decide.

5 min readUpdated September 2026

Published by Navigate Care. How we source our guides

In this guide 5 sections

01

Compare the same policy before comparing the price

Medicare’s Medigap basics explains that policies with the same letter provide the same basic benefits under the standard letter system. That applies to a comparison of standard Plan G policies in South Carolina. Massachusetts, Minnesota and Wisconsin use different standardization. Confirm the exact policy name and version on the written quote.

A comparison of standard Plan G with high-deductible Plan G is a comparison of different payment arrangements. Medicare’s benefits chart explains that high-deductible Plan G requires you to pay covered costs up to its separate annual deductible before the policy pays. Check the current year’s amount on that page and on the quote.

Also ask whether the policy is Medicare SELECT. Medicare says SELECT policies may require you to use certain providers. Read those restrictions before treating a SELECT quote as interchangeable with another Plan G offer.


02

Know the cost that Plan G does not cover

Medicare’s plan comparison lists “No” for Plan G coverage of the Part B deductible. Even with standard Plan G, that deductible can remain your responsibility. Medigap also does not mean every service is covered. Use the policy and Medicare’s coverage rules for the particular service, and keep your premium payments separate from what a claim may leave you owing.


03

Ask each insurer the same questions

  1. 1.Is this standard Plan G, high-deductible Plan G or a Medicare SELECT policy? What restrictions or additional deductible apply?
  2. 2.What premium applies to my age, location, requested start date and other application details? Ask for a written quote.
  3. 3.How does the insurer price the policy, and can premiums change as I age or for other reasons? Medicare describes community-rated, issue-age-rated and attained-age-rated pricing; none is a promise that the premium will never increase.
  4. 4.Which discounts are included, who qualifies, and what happens if the discount ends?
  5. 5.How do I contact customer service, check a claim or resolve a billing problem? Ask the state insurance department about complaint information for the insurer.

These questions follow Medicare’s guidance on Medigap costs and buying a policy. A current quote is more useful than another member’s premium: their age, location, discounts and enrollment circumstances may differ. Historical increases can inform your questions but cannot guarantee next year’s price.


04

Check your right to buy or switch

The one-time federal Medigap Open Enrollment Period generally lasts six months, starting the first month you are at least 65 and enrolled in Part B. After that, there may be no guarantee that an insurer will sell you a policy unless a guaranteed-issue right or other protection applies. State protections can differ. Review Medicare’s when-to-buy guidance and confirm your situation before canceling existing coverage.

A SHIP counselor can provide free, impartial Medicare counseling. Your state insurance department can help with insurer licensing and complaint questions. This article does not rank carriers or recommend one insurer for your individual circumstances.


05

If the concern is a bill rather than choosing a policy

A bill does not necessarily mean one insurer offers different basic Plan G benefits. The claim may still be processing, information may need correction, or the amount may be a cost the policy does not cover. Our Medicare Summary Notice and Medigap claims guide explains how to check whether a claim reached your supplement and how to compare the statements.


Questions families ask

Are standard Plan G benefits different at two insurers in South Carolina?

The basic standardized Plan G benefits are the same. Premiums, discounts and customer service can differ. Confirm that both quotes are for the same version of Plan G and check for high-deductible or Medicare SELECT differences.

Does Plan G cover the Part B deductible?

No. Medicare’s comparison chart lists the Part B deductible as not covered by Plan G. A high-deductible Plan G policy also has its own deductible requirements before the policy pays.

Does a lower quote mean the insurer has worse benefits?

Not necessarily. Compare the exact policy version and its standardized benefits, then the price, discounts, service and any restrictions. A lower premium alone does not establish the quality of an insurer.

Can I assume a company with small past increases will stay cheapest?

No. Historical prices do not guarantee future premiums. Ask how premiums are set, which discounts apply and how the policy’s price can change.

Can I switch Medigap policies whenever I find a cheaper quote?

Do not assume that an insurer must accept your application outside a protected enrollment or guaranteed-issue situation. Confirm federal and state rights and the new coverage before canceling an existing policy.

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