📋 Facts sourced from Medicare & You 2026, the official U.S. government Medicare handbook.

The Core Concept

According to Medicare & You 2026, Medicare Advantage (Part C) is a Medicare-approved plan from a private company that offers an alternative to Original Medicare for your health and drug coverage. These plans bundle together your Part A (hospital), Part B (medical), and usually Part D (drug coverage) into a single plan.

You must still have Medicare Part A and Part B to join a Medicare Advantage Plan, and you'll still pay your monthly Part B premium. The plan itself may charge an additional premium — or in many cases, the plan premium is $0. But $0 plan premium does not mean free coverage; it means the plan is funded through the capitated payments Medicare makes to the private insurer on your behalf.

You keep Part A and Part B — you just get them through the plan

When you join a Medicare Advantage Plan, you don't give up Original Medicare. Your Medicare card still exists. But for most of your care, you use your plan's card instead. The private insurer manages your benefits and sets the cost-sharing rules within limits set by Medicare.

The Out-of-Pocket Maximum — The Biggest Advantage

The single most important structural difference between Medicare Advantage and Original Medicare is the required out-of-pocket maximum. According to Medicare & You 2026, all Medicare Advantage Plans must have a yearly limit on what you pay for covered Medicare services. Once you reach your plan's limit, you pay nothing for covered services for the rest of the year.

Original Medicare has no such cap. You could theoretically pay 20% coinsurance on $100,000 in Part B services and owe $20,000 with no ceiling. For people without a Medigap supplement, the out-of-pocket maximum in a Medicare Advantage Plan provides meaningful protection that Original Medicare alone cannot offer.

The cap only applies to covered in-network services

Most plans have separate — and higher — out-of-pocket limits for out-of-network services. And the cap only applies to Part A and Part B services covered by the plan. Costs for services your plan doesn't cover, non-formulary drugs, or out-of-network providers (depending on plan type) may not count toward your maximum. Read the plan documents carefully.

What Medicare Advantage Plans Must Cover

According to Medicare & You 2026, plans must cover all medically necessary services that Original Medicare covers. They cannot legally offer less than what Original Medicare provides for Part A and Part B services. What they can do is change how those services are accessed — requiring referrals, restricting networks, and requiring prior authorization.

Plans may also offer extra benefits that Original Medicare doesn't cover — and this is where a lot of the marketing appeal comes from. Common extras include:

Networks and Service Areas

According to Medicare & You 2026, you may need to use doctors and other providers who are in the plan's network and service area for non-emergency care. Some plans offer non-emergency coverage out of network, but typically at a higher cost. This is the most significant practical difference from Original Medicare, which lets you use any provider anywhere in the country who accepts Medicare.

If you live in one state and winter in another, or if you travel frequently, network restrictions matter a great deal. Emergency care is always covered anywhere in the U.S. — but "urgently needed care" (not quite an emergency) has its own rules that vary by plan.

Prior Authorization

According to Medicare & You 2026, you may need to get approval (prior authorization) from your plan before it covers certain services or supplies. Original Medicare, by contrast, generally does not require prior authorization — if your doctor orders a covered service, Medicare pays.

Prior authorization is one of the most common sources of frustration for Medicare Advantage enrollees. Denial rates and the appeals process vary significantly by plan and insurer. If you're managing a complex condition or anticipate significant medical needs, this is something to research carefully before choosing a plan.

You cannot add Medigap while enrolled in Medicare Advantage

According to Medicare & You 2026, you can't buy Medigap to cover your out-of-pocket costs while in a Medicare Advantage Plan. This matters enormously if you later want to switch back to Original Medicare — you may not be able to get a Medigap plan at an affordable price (or at all) once you've left Advantage, because Medigap insurers can use medical underwriting outside of your initial open enrollment period. This is the decision that, once made, can be very difficult to undo.

How Hospice Works in Medicare Advantage

This surprises many people: according to Medicare & You 2026, even if you're in a Medicare Advantage Plan, Original Medicare pays for your hospice care — not your Advantage plan. You are not required to switch back to Original Medicare to receive hospice. Your Advantage plan continues to cover services unrelated to your terminal illness during that time.

Extra Benefits Are Not Guaranteed Year to Year

One thing advisors stress that the marketing doesn't: Medicare Advantage Plans can change their benefits, formularies, networks, and premiums every year. The $0 premium and dental coverage you enrolled for may change significantly by next January. During Open Enrollment (October 15 – December 7), you should review your plan's Annual Notice of Change to see what's different for the coming year — and compare alternatives.

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Betsy's Take

"The thing I tell every client who is considering Medicare Advantage: don't make this decision based on the commercials or what your neighbor has. The right plan depends on what doctors you want to keep, what drugs you're on, how much you use health care, and whether you travel. I look at all of this before making any recommendation — and I represent every carrier, so I have no reason to steer you anywhere except where you'll be best served."

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