Inspired by Geoff Schmidt / Holy Schmidt, including the Nov 8, 2026 note. Rewritten from Medicare.gov and the CMS Medigap guide — not a reprint, not advice.
Related: Medicare Advantage vs Medigap (age-65 window)
When you first take Medicare, you pick a stack:
Both can be legitimate. The part people undersell: the right to choose today is not the same as the right to change your mind later. You can often leave Advantage and go back to Original Medicare during an enrollment window. Getting the Medigap policy you want after that is a different, harder question.
| If this is you… | Lean this way |
|---|---|
| RV travel, snowbird, or a CA → ID move; want any Medicare doctor | Original + Medigap Plan G + Part D |
| Healthy, local network is fine, like $0 extra premium and dental/vision extras | Advantage can work — treat the first 12 months as a trial, review it every fall |
| Want to “try Advantage and switch to Medigap at 75 if health gets worse” | That’s the trap. Underwriting may block the switch when you need it |
Once you are 65+ and enrolled in Part B, federal law gives you a one-time 6-month Medigap Open Enrollment Period. It starts the first month you have Part B and are 65 or older. During that window you can buy any Medigap policy sold in your state. The insurer can’t use medical underwriting to reject you or price you for pre-existing conditions.
That window does not repeat every fall like Medicare Open Enrollment. After it ends, companies generally do not have to sell you a policy unless you qualify for a guaranteed-issue right. Some states add extra protections — check your state insurance department, not a Facebook ad.
Blunt take: the Medicare choice at 65 can lock or unlock options at 75.
Official: Medigap Open Enrollment · Medigap basics
Federal rules give two important “try it” protections:
You generally need Original Medicare (A + B) to buy Medigap. You can’t stack Medigap on top of Advantage to pay Advantage copays.
After those trial rights expire, switching is no longer a federal guarantee. You may still drop Advantage for Original Medicare. The Medigap underwriting is the part that can say no.
Official: How Medigap works (trial rights)
The 12-month trial is not the only way back. CMS lists a separate guaranteed-issue right if you already have Advantage and any of these are true:
You only get that right if you switch to Original Medicare, not into another Advantage plan. The insurer must sell you Medigap Plan A, B, D, or G (C or F only if you were eligible for Medicare before January 1, 2020), must cover pre-existing conditions, and can’t charge more because of your health. Apply up to 60 days before that coverage ends, by the date in the plan’s termination notice, and no more than 63 days after it ends. The Medigap policy can’t start until the Advantage coverage ends.
That is a loss-of-coverage right. It is not a “my health got worse, I want Plan G now” right.
Official: Choosing a Medigap Policy (CMS), Section 3
Advantage can look cheap. Some plans charge $0 extra premium on top of the Part B premium you still pay. That is not the same as cheap healthcare.
Plan N still leaves you small office/ER copays (up to $20 office / $50 ER if you aren’t admitted). Plan G is the usual “pay the Part B deductible, then the rest of Medicare-approved amounts are covered” pick for people new to Medicare on or after 2020 (Plans C and F are closed to that group).
The question is not only “what does this cost this month?” It’s “what does this cost when I actually need care?”
Advantage plans do have a yearly limit on what you pay for covered Medicare services. That limit can differ for in-network and out-of-network care. Once you hit it, you pay nothing for those covered services for the rest of the year. That cap is not the whole bill. Covered prescription drugs have their own out-of-pocket maximum — $2,100 in 2026 — separate from the medical limit. Premiums still get paid either way.
Run two years, not one. A healthy year with a few visits can make a $0-extra Advantage plan look like the winner. A surgery year with specialists, imaging, and rehab can flip that. The reverse is also true: stay relatively healthy for many years and Medigap premiums can add up to more than Advantage would have cost. Neither side wins on premium alone.
Official: How Medicare works · Compare Medigap letters · Compare Original vs Advantage · 2026 drug out-of-pocket maximum
Advantage plans generally use networks. Out-of-network care may cost more or not be covered except in limited cases (emergency, urgent, out-of-area dialysis, depending on plan type).
Original Medicare lets you see any doctor or hospital that takes Medicare, anywhere in the U.S. Medigap then helps with the leftover bills. That matters if you:
Most people shop premium. Shop access too — especially with an 18ft RV.
Official: Original Medicare vs Advantage access · Advantage plan types / networks
Many Advantage plans require the plan to approve certain services before they pay. Original Medicare uses prior authorization on a much smaller set of items.
KFF’s 2024 CMS-data analysis:
That’s not “Advantage always denies care.” It is “a non-trivial number of denials get reversed when someone fights them — and most people don’t appeal.” Delays still happen even when the answer eventually is yes. That gets more annoying as care gets complicated.
Official: KFF, 2024 prior authorization · Medicare.gov notes Advantage typically needs prior auth for certain services
Advantage is not a one-and-done product. Premiums, deductibles, copays, drug lists, networks, and service area can change every year. Doctors can leave the network. Your health can change too.
If you’re in a Medicare plan, it sends an Annual Notice of Change (ANOC) each fall. That notice is the homework: decide whether next year’s version still fits. Don’t assume last year’s $0 plan is still the same deal.
Official: Plan Annual Notice of Change
At 65 you may be healthy. A local Advantage plan with a low extra premium can work extremely well.
Then you’re 75. Health changed. The specialist you want isn’t in network. You moved. You want Original Medicare plus Medigap.
Leaving Advantage for Original Medicare during an applicable enrollment period is often doable. Buying the Medigap policy you want, outside Open Enrollment or another guaranteed-issue right, can depend on your health, the insurer, and your state’s extra rules. The reason you want Medigap later (worse health) is often the same reason underwriting says no.
Medicare.gov is explicit: after the 6-month window, you may not be able to buy a policy, or it may cost more. Outside that window there is no federal guarantee an insurer will sell you one.
Official: When can I buy Medigap?
Federal law is the floor. A few states add stronger Medigap guaranteed-issue or birthday-rule switching. Those rules change, and they are state-specific. Confirm with your state insurance department and SHIP before betting a later switch.
If you’re moving (Bay Area → Star/Boise), check both states. Medigap is generally issued in the state where you live. Advantage networks are local. Original Medicare travels; Advantage often doesn’t travel well outside its service area.
Official: Medicare.gov — check your State Insurance Department for extra rights
No.
Advantage can be a good fit if you like a lower extra premium, you’re fine with that plan’s network and cost-sharing, you’ll read the ANOC every fall, and you want extras Original Medicare usually skips (some dental, vision, hearing).
Original + Medigap is a good fit if you want nationwide doctors, RV / two-state living, and a more premium-heavy, usage-light cost structure.
The job is not to pick a tribe. It’s to know what you’re buying and what it costs you if you want out later.
For nationwide doctors, an 18ft RV, and a possible California → Idaho move: Original Medicare A + B, Medigap Plan G, standalone Part D. Plan N if you want a cheaper premium and will take the office/ER copays. Advantage only if you accept a local network and yearly plan churn.
Still on a large employer plan: delaying Part B is often available. If HSA contributions still matter, delay Medicare entirely — Part A enrollment ends HSA eligibility.
Don’t pick the stack with the lowest premium at 65 and call it done.
The best option is the one that fits care you need now and leaves a level of flexibility you can live with later.
Education only — not financial, tax, or medical advice, and not affiliated with CMS or SSA. Confirm with Medicare.gov, 1-800-MEDICARE, your state SHIP, and a licensed agent. Rules vary by state and can change.
Geoff Schmidt / Holy Schmidt: YouTube · HolySchmidt.com