➤ What is the main difference between Medigap and Medicare Advantage?
Medigap adds to Original Medicare by paying the deductibles and coinsurance Medicare leaves behind, and you keep using any provider that accepts Medicare. Medicare Advantage replaces Original Medicare with a private plan that has its own network, its own copays and usually its own built-in drug coverage. One supplements Medicare, the other administers it.
➤ Can I have both Medigap and a Medicare Advantage plan?
No. A Medigap policy pays nothing while you are enrolled in a Medicare Advantage plan, so holding both means paying a premium for coverage that does not function. If you move to an Advantage plan, drop the supplement. It is also illegal for an agent to knowingly sell you a Medigap policy while you are on an Advantage plan, outside of narrow circumstances.
➤ Which one is cheaper, Medigap or Medicare Advantage?
Medicare Advantage is almost always cheaper month to month, frequently $0 in plan premium. Medigap is usually cheaper over a year for someone who uses a lot of care, because the copays add up on the Advantage side while a comprehensive supplement leaves little to pay. The honest answer is that it depends on how much care you use and what your out-of-pocket exposure looks like in a bad year rather than an average one.
➤ Do I still pay the Part B premium with either one?
Yes, both paths require you to keep paying your Part B premium, which is $202.90 a month in 2026 for most people. Neither Medigap nor Medicare Advantage replaces it. Some Advantage plans offer a partial giveback that reduces what comes out of your Social Security check, but the obligation itself does not go away.
➤ Does Medigap cover prescription drugs?
No. Medigap policies sold today do not include drug coverage, so you buy a standalone Part D plan alongside the supplement. Do not skip it even if you take no medications, because enrolling late without other creditable coverage triggers a penalty that is added to your premium permanently. In 2027 the Part D out-of-pocket cap is $2,400.
➤ Can I switch from Medicare Advantage to Medigap later?
Sometimes, but it is not guaranteed. Outside your six-month Medigap open enrollment window, most states let insurers use medical underwriting, which means they can decline your application based on your health. Limited exceptions exist, including a trial right if you joined a Medicare Advantage plan for the first time and want to leave within twelve months, and a handful of states with more generous rules. Assume it may not be available rather than counting on it.
➤ Which is better if I travel a lot or live in two states?
Medigap, in most cases. Because it follows Original Medicare rather than a network, it works with any provider in the country that accepts Medicare, so routine care in a second state is not a problem. Medicare Advantage coverage is built around a county-level service area, and while emergency care is covered anywhere, routine care outside the area usually is not.
➤ Do Medicare Advantage plans really include dental and vision?
Many do, but what is included varies significantly by plan and by area, and the allowances are not unlimited. Read the specific plan’s benefit summary rather than the advertising. Medigap includes none of these — it pays medical costs only — so if extra benefits matter to you, that is a genuine point in favor of Advantage.
➤ What is prior authorization and does Medigap have it?
Prior authorization is approval from the insurer before a procedure, scan or admission goes ahead. Medicare Advantage plans use it; Original Medicare with a Medigap policy generally does not work that way. Whether it matters depends on the care you expect to need, but it is a real difference in how quickly things move when you need something done.
➤ When can I change between Medigap and Medicare Advantage?
Annual Enrollment runs October 15 through December 7, 2026, for coverage beginning January 1, 2027, and that is when you can join, drop or switch Medicare Advantage plans. The Medicare Advantage Open Enrollment Period from January 1 to March 31, 2027 gives current Advantage members one further change. Medigap has no annual enrollment period at all — you can apply any time, but outside a guaranteed-issue situation the insurer decides whether to accept you.