What it is
Medicare Supplement, or Medigap, is private insurance that works alongside Original Medicare (Parts A and B). It may help pay some of the costs Original Medicare leaves behind, such as certain deductibles, coinsurance and copayments. Medigap plans are labeled with letters, and the benefits for each lettered plan are standardized in most states. Plans C and F are only available to people who were eligible for Medicare before 1 January 2020.
Medicare Advantage, also called Part C, is a different route. Private insurance companies offer plans that take the place of Original Medicare while still covering Part A and Part B benefits. Many include prescription drug coverage and may add extras such as dental, vision or hearing. They typically use networks, and cost-sharing varies by plan.
The two cannot be combined: Medigap works only with Original Medicare, not with a Medicare Advantage plan. Medigap does not include drug coverage, so people who choose it generally add a separate Part D drug plan. Medicare Advantage plans often include drug coverage in the same plan.
How it’s traditionally been approached
Many people have approached Medigap as a way to keep Original Medicare and add predictability. Medigap lets you see any provider that accepts Medicare, with no network to stay within, and its cost-sharing is relatively predictable. The trade-offs are that premiums are generally higher, medical underwriting may apply outside open enrollment or guaranteed-issue periods, and a separate Part D plan is needed.
Others have approached Medicare Advantage as an all-in-one option. Drug coverage is often included, and extra benefits may be part of the plan. The trade-offs include provider networks, prior authorization requirements for some services, and cost-sharing that varies from plan to plan and may change from year to year.
Some people weigh how often they travel, how much they value choosing any doctor, how they feel about networks, and how comfortable they are with variable costs. Timing matters too, since the rules for switching can differ. Medicare.gov and a licensed agent can explain current rules.
How the right agent may help
The right independent agent may help you sort through these choices by explaining how each type works and how plans in your area may differ. A conversation is generally an information-gathering visit. The agent may ask about your doctors, prescriptions, preferred pharmacies, budget comfort and how you use care.
Useful questions to ask include: Are my doctors and hospitals in the network, or do they accept Medicare? How does the plan handle prior authorization? What would my costs look like in a typical year and in a hard year? How would a drug plan fit with my prescriptions? What happens if I want to change plans later, and could underwriting apply?
Medicare plans are sold by agents who are appointed with each carrier, and they must be licensed in each state where they sell. Ask which carriers the agent represents, and confirm their license with your state insurance department. Quotes come from licensed agents, not from 2A Benefit, and no agent can promise a particular outcome.
The bigger picture
Choosing health benefits plans is about more than paperwork. Uncertainty about medical bills or access to doctors can weigh on peace of mind, and a choice that fits your routines may make it easier to seek care when you need it. Some people value predictability, while others value simplicity or added benefits.
Taking time to understand your options, involving someone you trust, and revisiting your choice as life changes can support your overall wellbeing. If you are also looking for care providers, Providers.plus may be one place to start exploring.
Keep in mind
- This page is educational only and is not insurance, legal, tax, medical or financial advice.
- 2A Benefit is an independent, privately run directory, not an insurer, and does not sell policies. It is not connected with or endorsed by the U.S. government, Medicare, CMS, Medicare.gov or HealthCare.gov.
- Costs, networks, benefits and rules vary by carrier, state and year, so confirm details directly with the plan or a licensed agent, and use Medicare.gov for current official rules.
- Neither option is best for everyone, and acceptance or savings can never be guaranteed.
Not sure where to start? Answer a few gentle questions and choose who you’d like to hear from.
Frequently asked questions
What is the main difference between Medigap vs Medicare Advantage?
Medigap supplements Original Medicare, while Medicare Advantage replaces it with a private plan. Medigap generally lets you see any provider that accepts Medicare, while Medicare Advantage typically uses networks and may include drug coverage and extra benefits. Costs and rules vary, so compare plan details directly.
Can I have Medigap and Medicare Advantage at the same time?
No, Medigap is designed to work with Original Medicare and does not work with a Medicare Advantage plan. People generally choose one path or the other. A licensed agent or Medicare.gov can explain current rules for your situation.
Does Medigap cover prescription drugs?
No, Medigap plans do not include prescription drug coverage. People who choose Medigap typically add a separate Medicare Part D drug plan. Many Medicare Advantage plans include drug coverage in the same plan.
Which Medigap plan letters are available?
Medigap plans are identified by letters, and the standardized benefits for each letter are generally the same across carriers in most states. Plans C and F are only available to people who were eligible for Medicare before 1 January 2020. Availability varies by state and carrier, so ask a licensed agent what is offered where you live.
Can I switch between Medigap and Medicare Advantage later?
Sometimes, but the rules depend on timing and your situation. Moving to Medigap outside open enrollment or guaranteed-issue periods may involve medical underwriting, which can affect whether you are accepted. Check with Medicare.gov or a licensed agent about current switching rules.
How do I find a trustworthy agent for Medigap vs Medicare Advantage questions?
Look for an agent licensed in your state and appointed with the carriers they discuss. You can confirm a license with your state insurance department. A good agent may explain several options, answer questions plainly and avoid pressure.
Educational resource. 2A Benefit shares general information and connects people with independent agents. It is not professional advice. Talk with a qualified professional about your own situation.