What it is
Original Medicare is the federal program with Part A (hospital) and Part B (medical). On its own, it does not pay everything. You may still owe shares of costs. Medigap, also called Medicare Supplement, is private insurance that may help cover some of those shares.
Medigap plans are sold as standardized letters. Only Plans A, B, D, G, K, L, M and N (and high-deductible Plan G) are sold to people newly eligible for Medicare. Plans C and F (and high-deductible F) are available only to people who became eligible before January 1, 2020. Plans E, H, I and J were discontinued and are not sold today, even though people still search for Plan H. Massachusetts, Minnesota and Wisconsin standardize Medigap differently.
Medicare Advantage, or Part C, is offered by private companies approved by Medicare. It bundles Part A and Part B, and often drug coverage and extras, into one plan. Plans usually use networks, and rules differ by plan and area. You generally still have Medicare, but the private plan manages your benefits.
How it’s traditionally been approached
People who choose Medigap with Original Medicare often value the freedom it offers. They may see any provider nationwide who accepts Medicare, with no network and generally no referrals. Cost-sharing tends to be more predictable. The trade-offs are that monthly premiums are generally higher, and medical underwriting may apply outside open enrollment or guaranteed issue. Drugs need a separate Part D plan, and routine dental, vision and hearing are not included.
People who choose Medicare Advantage often value the all-in-one design. Premiums are often lower, there is an annual out-of-pocket maximum, and many plans include extra benefits and drug coverage. The trade-offs are provider networks, possible prior authorization, and copays for services. Benefits and networks can also change from year to year.
Neither approach is right for everyone. Health needs, budget, travel habits, preferred doctors and comfort with uncertainty all play a part. Some people also switch over time. Switching from Medicare Advantage to Medigap may be possible, but it depends on timing and state rules. Some people have a Medicare Advantage trial right, which may let them return to Original Medicare in certain situations. Confirm current rules with Medicare.gov, your State Health Insurance Assistance Program (SHIP), or a licensed agent.
How the right licensed agent may help
A Medigap agent is an independent licensed professional who may help you sort through these choices. A conversation is often relaxed. The agent may ask about your doctors, prescriptions, travel, budget and how you feel about network rules. There is no need to have everything figured out beforehand.
Helpful questions to ask include: Which carriers sell Medigap in my state? How do enrollment windows and underwriting apply to me? What happens if I want to switch later? How would my drugs be covered? What do I give up and gain with each path? A good agent should explain the trade-offs of both options fairly.
An agent may also help you understand timing, such as open enrollment, guaranteed issue and trial rights, which vary by state and change over time. This is education, not a promise of any result or acceptance. Call 1-800-MEDIGAP for more information.
The bigger picture
Choosing coverage is about more than paperwork. Some people feel calmer knowing they can see nearly any Medicare-accepting provider. Others feel better with a lower premium, a spending cap and extra benefits in one plan. Peace of mind looks different for each person.
Stress about money or care access can affect sleep, mood and health. Taking time to compare calmly, and asking for help, may ease that load. If finding the right doctors is part of your plan, Providers.plus may be a helpful resource. Neither choice is wrong, and you can ask questions at your own pace.
Keep in mind
- 1-800-MEDIGAP is an independent, privately run educational site. It is not Medicare.gov, CMS, Social Security or any government agency. Official information is at Medicare.gov.
- This page is insurance education only, not insurance, legal, tax or medical advice.
- Enrollment windows, guaranteed issue, underwriting and switching rules vary by state and change over time. Confirm current rules before you decide.
- Costs and benefits change every year and differ by carrier, state and age, so compare current details for the plans available to you.
Take the next step
- Talk with a Medigap agent ↗Jeff Cline on contacts.plus — a person, not a call center.
Guides in this topic
Licensed agent types
Medicare Advantage comparisons
side-by-side Medigap vs Medicare Advantage reviews · network and referral rules · extra benefits overview
Switching plans & guaranteed issue
guaranteed issue rights · medical underwriting · state-specific switching rules · Medicare Advantage trial right
Medigap Plan G
Plan G · high-deductible Plan G
Call 1-800-MEDIGAP for more information
Frequently asked questions
What is the difference between Medigap vs Medicare Advantage?
Medigap works alongside Original Medicare and may help cover some of its out-of-pocket costs. Medicare Advantage is a private plan that replaces Original Medicare with one bundled plan. Medigap generally offers broader provider choice, while Medicare Advantage often has lower premiums and extra benefits.
Is a Medicare Supplement the same as Medicare Advantage?
No. A Medicare Supplement, or Medigap, is added to Original Medicare. Medicare Advantage is a different way of getting Medicare through a private plan. In general, you cannot use Medigap together with a Medicare Advantage plan.
Can I switch from Medicare Advantage to Medigap?
Sometimes, yes, but it depends on timing and your state. Medigap carriers may use medical underwriting outside certain windows, so acceptance is not guaranteed. Confirm current rules with Medicare.gov, your SHIP, or a licensed agent.
What is the Medicare Advantage trial right?
It is a special right that may let some people try Medicare Advantage and later return to Original Medicare with a Medigap plan, in certain situations. Conditions and time limits apply and may vary by state. Check current details with Medicare.gov, your SHIP, or a licensed agent.
What are the pros and cons of Medigap?
Pros include nationwide access to any provider that accepts Medicare, no networks or referrals, and predictable cost-sharing. Cons include generally higher monthly premiums, possible underwriting outside open enrollment or guaranteed issue, a separate Part D plan for drugs, and no routine dental, vision or hearing.
Is Original Medicare vs Medicare Advantage a one-time choice?
No. You can generally review your coverage during certain enrollment periods each year, though rules vary. Medigap switches can be harder if underwriting applies. Call 1-800-MEDIGAP for more information.
Educational resource. 1-800-MEDIGAP shares general information and connects people with independent licensed agents. It is not professional advice. Talk with a qualified professional about your own situation.