Medicare Supplement, explained without the jargon
Also called Medigap. It works alongside Original Medicare to help pay the share Medicare leaves to you. A licensed agent can walk you through which lettered plan fits.
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The basics
What a Supplement plan actually does
Original Medicare — Parts A and B — pays most of your covered costs, but not all of them. What's left over is your share: coinsurance, copayments and deductibles, with no annual cap. A Medicare Supplement plan is private insurance that helps pay that leftover share. It doesn't replace Original Medicare; it sits on top of it.
How these plans work
- Standardized by letter — a Plan G is the same core set of benefits no matter which company sells it. What differs between companies is price and service, not the covered benefits.
- You can generally see any doctor or hospital in the country that accepts Medicare. There is no network and no referral requirement.
- Because there's no network, these plans travel well — useful if you spend part of the year in another state.
- Coverage renews as long as you pay the premium, regardless of changes in your health.
It tends to suit people who
- Want to keep their own doctors without checking a network list
- Travel, or split the year between two states
- Prefer predictable monthly costs over paying as they go
- Want to add drug coverage separately rather than bundled
Worth knowing before you decide
- Supplement plans do not include prescription drug coverage. Most people add a separate Part D plan.
- Plans C and F are not available to people who first became eligible for Medicare on or after January 1, 2020.
- Timing matters. During your Medigap open enrollment period — six months beginning when your Part B starts — you can generally buy any plan sold in your area regardless of health. Outside that window, medical underwriting may apply.
- You keep paying your Part B premium in addition to the Supplement premium.
Common questions
Questions people actually ask
Is Medigap the same thing as Medicare Advantage?
No, and they're alternatives rather than companions — you can't meaningfully use both. A Supplement plan works alongside Original Medicare and helps pay your share of its costs. A Medicare Advantage plan replaces the way you receive your Medicare benefits entirely. Choosing between them is the single biggest decision most people make, which is exactly the kind of thing worth a phone call.
Do I still need Part D if I have a Supplement plan?
Almost always yes. Supplement plans don't cover prescriptions, so drug coverage is a separate Part D plan. Going without creditable drug coverage can also mean a late enrollment penalty that stays with you, so it's worth sorting out at the same time rather than later.
Can I be turned down for a Supplement plan?
It depends on when you apply. Inside your six-month Medigap open enrollment period, you generally can't be refused or charged more for health reasons. Outside it, an insurer may be able to use medical underwriting. Some states add their own protections, so it's worth asking about your specific situation.
Does the same lettered plan cost the same everywhere?
No. The benefits of a given letter are standardized, but the price is not — different companies charge different premiums for identical coverage, and prices vary by area and by how the insurer rates age. That gap is the main reason comparing is worth doing.
Not sure if this is the right fit?
That’s the normal starting point. A licensed agent will talk it through with you — no cost, no obligation.
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