Medicare Advantage or a Medicare Supplement: how to choose the one that fits you

The honest answer: it depends on how you use care

Neither is better for everyone. Medicare Advantage usually works through a network, often includes drug coverage and extra benefits, and caps your yearly out-of-pocket costs for covered services. Original Medicare with a Medicare Supplement, also called Medigap, lets you see any doctor or hospital in the country that takes Medicare and helps pay the costs Original Medicare leaves behind, usually with a separate Part D drug plan. The right choice depends on your doctors, your health, how much you travel and how you prefer to pay for care, and the timing of the decision matters because Medigap can be harder to buy later.

I am Rex Slover of Slover Agency, and I compare Medicare Advantage, Medicare Supplement and Part D plans for people turning 65 and for people already on Medicare around Murphy, Plano and Dallas. What follows is general information drawn from Medicare's own materials and my experience. Your choice should rest on the specific plans available where you live.

How each path works, in plain terms

Both paths start with Medicare Part A, hospital insurance, and Part B, medical insurance. With Medicare Advantage, also called Part C, a private company approved by Medicare provides your Part A and Part B benefits through its plan, and most of these plans include prescription drug coverage. You use the plan's card, not your red, white and blue Medicare card, for most care.

With the other path, you keep Original Medicare as your main coverage and add two private policies around it: a Medicare Supplement policy to help with deductibles, coinsurance and other gaps, and a standalone Part D plan for prescriptions. Medicare pays its share of each claim first, and the Supplement pays its share after.

Medicare.gov makes one rule very clear: it is illegal for someone to sell you a Medigap policy if you have a Medicare Advantage plan. You choose one path or the other, not both.

The differences that matter, side by side

Medicare.gov's comparison of Original Medicare and Medicare Advantage lays out the main trade-offs. I have grouped them the way people usually weigh them when they sit down with me.

• Doctors: Original Medicare lets you use any doctor or hospital that takes Medicare anywhere in the U.S.; Medicare Advantage may require you to use the plan's network and service area for non-emergency care
• Referrals: with Original Medicare you usually do not need a referral to see a specialist; a Medicare Advantage plan may require one
• Yearly cost limit: Original Medicare has no yearly cap on what you pay unless you add supplemental coverage; Medicare Advantage plans have a yearly limit for covered services
• Drug coverage: with Original Medicare you join a separate Part D plan; most Medicare Advantage plans include Part D
• Extras: Original Medicare does not cover routine physicals, eye exams or most dental care; Medicare Advantage plans may offer some vision, hearing and dental benefits
• Travel abroad: Original Medicare generally does not cover care outside the U.S., though a Medigap policy may cover emergency care abroad; Medicare Advantage plans generally do not cover care abroad, though some offer emergency and urgent care while traveling

When Medicare Advantage tends to fit

In my experience, Medicare Advantage suits people whose doctors are in a plan's network, who are comfortable with referrals and network rules, and who spend most of the year close to home. For someone who lives in the Dallas area year-round and whose physicians all belong to the same network, the structure often feels less like a restriction and more like coordination.

People also choose it for the extras and the cost structure. Paying smaller amounts as you use care, with a yearly limit on covered services, appeals to many people, and dental, vision or hearing benefits can matter to someone who would otherwise pay for those entirely out of pocket. The trade-off is that the network and the plan's rules shape where and how you get care, and plans can change their networks and benefits from year to year.

When a Medicare Supplement tends to fit

A Supplement with Original Medicare tends to suit people who want to see any doctor who takes Medicare without checking a network, people who see several specialists, and people who spend long stretches away from home, whether visiting family in another state or wintering somewhere warmer. Because Original Medicare works nationwide, the coverage travels with you inside the U.S.

It also suits people who prefer predictability. You pay a monthly premium for the Supplement and another for Part D, and in return your costs when you use care are more predictable, depending on the Supplement plan you choose. Some people would rather budget a known monthly amount than wonder what a bad year will cost.

The timing rule that makes this choice hard to undo

This is the part many people never hear until it is too late. Medicare.gov explains that the best time to buy a Medigap policy is during your Medigap Open Enrollment Period, the six months that start on the first day of the month you are 65 or older and enrolled in Part B. During that window, you have the strongest protections when you apply.

After that window, Medicare.gov says your options may be limited and the policy may cost more because of past or present health problems, and there is no federal guarantee that a company will sell you one. Every fall, during Medicare Open Enrollment from October 15 to December 7, you can move between Original Medicare and Medicare Advantage. But moving back to Original Medicare does not guarantee you can add a Supplement at that point.

In practice, that means a person who starts on Medicare Advantage at 65 and develops health problems may find it harder to switch to a Supplement later. That is not a reason to avoid Medicare Advantage. It is a reason to make the first choice deliberately, especially if you have health conditions now. If you are still working, the date you choose for Part B starts the Medigap clock, which I explain in whether you need Medicare at 65 if you are still working.

Prescriptions decide more than people expect

Whichever path you take, check your prescriptions against the specific plan before you enroll. On the Medicare Advantage side, the drug coverage is usually built into the plan. On the Supplement side, you pick a separate Part D plan, and different Part D plans cover drugs differently and can change their lists each year.

Bring a complete list of your medications with doses to any comparison. A plan that looks inexpensive can turn out costly if one of your regular drugs is not covered or sits in an expensive tier. This step alone changes my recommendation more often than any other.

Also think about the medications you may need in the next few years, not only the ones you take today. You cannot predict everything, but if your doctor has mentioned a likely new prescription, ask about it before you lock in a plan for the year.

Where people go wrong with this decision

Most poor outcomes I see here are not the result of choosing the wrong path. They come from choosing without the facts that should have driven the choice, or from setting it and never looking at it again.

The common thread is treating Medicare as a one-time decision. Your health, your doctors and the plans themselves all change, and a choice that was right at 65 deserves a fresh look every year, even if the answer is usually to stay put.

• Picking a plan because a friend or neighbor likes theirs, when their doctors and prescriptions are different
• Choosing on the monthly premium alone, without estimating a hard year
• Assuming a doctor is in network because they were in network last year
• Letting the six-month Medigap window pass without realizing it existed
• Forgetting that a separate Part D plan is needed alongside a Supplement
• Ignoring the plan's notice of changes that arrives each fall

Questions to answer before you choose

Write your answers down before you look at a single plan. They narrow the choice faster than any brochure.

• Which doctors and hospitals do I want to keep, and which networks include them?
• How many specialists do I see, and how often?
• Do I spend weeks or months outside Texas each year?
• What are my regular prescriptions, and what do they cost on each plan?
• Do I prefer a higher, predictable monthly cost or lower premiums with costs as I use care?
• Do I have health conditions now that would make buying a Supplement later difficult?

How I compare the two with you

I start with your doctors, prescriptions, health and travel habits, then compare Medicare Advantage plans, Medicare Supplement plans and Part D plans across carriers available in your area. I show you what a quiet year and a hard year might look like on each path, and I tell you which I would choose in your position and why. You decide.

My services cost nothing, because carriers pay the broker. Make sure whoever helps you can offer both paths, not only one; I cover that and other checks in questions to ask a health insurance broker. After you enroll, your plan sends a notice of changes each fall, and the review I recommend is in the fall coverage checkup. For anyone in the Dallas area weighing this choice, the comparison is worth an hour before the Medigap window closes.

Questions people ask me