The whole picture — then how to find your door

How big is this, really?

Nearly 70 million people are on Medicare today — one of the largest programs in the entire federal budget. Every one of them had to make the same choice you’re about to make.

First, the myth I hear most: “Medicare is free”

It isn’t — and I’d rather you hear that from me, plainly, than find out from a bill. Almost none of us gets Medicare for nothing.

Part A — the hospital side — is the part most of us already paid for, through a lifetime of payroll taxes. If you or your spouse worked about ten years, Part A runs you $0 a month. That part really is paid up.

Part B — the doctor side — is where the monthly cost lives. In 2026 the standard Part B premium is $202.90 a month, and here’s what catches people off guard: you pay it no matter which door you choose. Original Medicare or Medicare Advantage, that Part B premium is still yours. A “$0 premium” Advantage plan isn’t free — it just means the plan adds nothing on top of the Part B you’re already paying.

(Higher earners pay more than the standard amount, and a few Advantage plans pay a little of it back — but for most of us, $202.90 a month is the number.)

The two doors, by the numbers

Twenty years ago, almost everyone walked through Door One. That’s changed. Today the country is split nearly down the middle — and it’s tilting toward Door Two.

For perspective: Medicare Advantage was under 1 in 5 beneficiaries back in 2007. It’s now the majority. Neither door is “winning” — but the map has shifted, and that’s worth knowing before you choose.

Shares are of the roughly 64 million people enrolled in both Medicare Part A and Part B; they don’t sum to exactly 100% due to rounding and a small number who hold Part A only. Enrollment figures reflect KFF and AHIP analyses of CMS data, 2025–2026 — these reset each year, so review annually.

The number that actually matters for your wallet

So — how do you make sure you’re not one of those 3.5 million? It starts with actually understanding the two doors. Not memorizing the alphabet — understanding the choice.

The clearest explanation I ever got didn’t come from my insurance textbooks. It came from my Mom. Let me tell you about her.

Here’s how she laid it out.

Grab your coffee — this is the notepad version.

“Medicare only looks complicated,” Mom said, “because everybody tries to build their own out of the pieces. You don’t. There are two doors. You pick one. The door you pick decides what’s on your plate — and once you see that, the whole alphabet stops being scary.”

So let’s open both doors. And unlike the game show, nobody’s hiding a goat behind one of them — you get to see exactly what’s back there before you choose.

Door Number One — Original Medicare

This is the government’s own program — the one Mom was on for twenty-some years. Two pieces do the heavy lifting:

• Part A is the hospital. Your inpatient stays, skilled nursing after a hospital stay, and hospice.
• Part B is the doctor. Office visits, outpatient care, lab work, the flu shot, the walker.

The big thing folks love about Door One is freedom: you can walk into any doctor or hospital in the country that takes Medicare — and nearly all of them do — with no network and no referral.

Here’s the catch Mom was honest about: Original Medicare doesn’t pay 100%. It leaves deductibles and a slice of every bill (usually about 20%), and there’s no cap on that slice by itself. So most people behind Door One add two things on the side:

• A Medigap policy to cover most of those leftover costs, and
• A Part D plan for prescriptions.

More freedom, a steadier monthly cost, a little more mail.

Door Number Two — Medicare Advantage

Behind Door Two is one bundled plan from a private insurance company that stands in for Original Medicare. Same Medicare underneath — a different way of delivering it. What you get:

• One card, one plan that usually rolls hospital (Part A), doctor (Part B), and drugs (Part D) together.
• Extras Original Medicare doesn’t cover on its own — often dental, vision, hearing, sometimes a gym membership.
• A yearly out-of-pocket maximum, so your spending has a ceiling.
• A premium that’s frequently low — sometimes $0 on top of your Part B.

The trade-off Mom would want me to say out loud: you work inside a network of doctors and hospitals, and you may need a referral or a prior approval before certain care. You trade a little freedom for a lower monthly cost and one simple plan.

Door One vs. Door Two, at a glance

The one rule that untangles everything

You can’t stand in both doorways at once.

If you choose Medicare Advantage (Door Two), you can’t also carry a Medigap policy — they’re two different systems and they don’t stack. That’s what “you don’t build your own” really means. You pick a door, and the rest follows.

(You can switch doors later, at the right times of year — but at any one moment, you’re standing in one doorway, not both.)

The two alphabets

This is the one nobody warns you about, and it’s the reason sharp people feel foolish reading Medicare booklets. There are two different alphabets.

• The Parts — A, B, C, D — are the pieces of Medicare itself. A is hospital. B is doctor. D is drugs. C is the sneaky one: Part C isn’t a piece you add on — it’s the whole of Door Two.
• The Plans — A, B, G, N, and the rest — are something else entirely. Those are the Medigap policies you can add behind Door One to cover what Original Medicare leaves on the table.

So “Part B” and “Plan G” aren’t even in the same alphabet. Mixing them up is like confusing Chapter 2 with Aisle 2. Once you know there are two lists, half the fog burns off.

The Medigap letters, in plain English

Don’t memorize this. Nobody expects you to. Most folks end up choosing between just two — Plan G and Plan N — and the rest are here so you can see the whole board.

In most states, any two policies with the same letter cover the same things; the price is what changes from company to company. (Massachusetts, Minnesota, and Wisconsin do it a little differently.)

Source: Medicare.gov — Compare Medigap Plan Benefits. Dollar figures shown are for 2026.

Where you live changes what’s on the table

Two people can be the same age, the same health, the same budget — and be looking at completely different choices, just because they live in different ZIP codes. Here’s how geography actually works, door by door:

• Original Medicare — Door One — is the same everywhere. Part A and Part B are federal. The coverage, the deductibles, the rules: identical in every state. And you can see any doctor in the country who takes Medicare. This part doesn’t care where you live.
• Medicare Advantage — Door Two — is decided by your county, right down to the ZIP. The plans you can get, what they cost, which doctors are in-network, and which extras come along are all set locally. A plan that’s perfect one county over might not even be sold where you live — your ZIP code literally decides your Door Two options. (Standalone drug plans are regional too.)
• Medigap sits in between. A Plan G covers the same things almost everywhere — but what it costs, and a few of the rules around switching, depend on your state. (Massachusetts, Minnesota, and Wisconsin play by their own rulebook entirely.)

Which is exactly why a national 1-800 number or a one-size website quiz can’t really answer this for you. The right plan isn’t the one that’s popular on TV — it’s the one that actually exists, and works, in your ZIP code. That’s the part I do: I work your county, not the national average.