Can I switch from Medicare Advantage to Medigap in Arizona?

Yes — you are always allowed to leave a Medicare Advantage plan and go back to Original Medicare. What you are not guaranteed is the Medigap policy you want to put underneath it. Those are two separate transactions, and in Arizona only the first one is a right.

That distinction is the whole article. Dropping the Advantage plan is a form and a date. Buying a Medicare Supplement is an application to a private insurance company that, outside a short list of protected situations, is allowed to ask about your health and turn you down. I have this conversation most often in north Peoria, with people who took an Advantage plan at 65 because the premium looked like nothing, and who now spend four months a year in Montana or Minnesota and have discovered what a network is.

The two steps, and why only one of them is guaranteed

Step one: leave the Advantage plan. Federal law gives you set windows for that, and nobody can refuse you.

Step two: buy a Medigap policy. Medigap is sold by private insurers under standardized federal plan letters, and the insurer decides whether to issue it. Medicare.gov puts the protection plainly — if you buy during your Medigap Open Enrollment Period or can give proof of a guaranteed issue right, the company cannot use any answers to medical questions to deny you a policy or change the price. Read the sentence the other way around and you have the problem: outside those windows, it can do both.

Your Medigap Open Enrollment Period is the six months that start the month you are 65 and enrolled in Part B. It happens once. For most people reading this, it closed years ago.

Why Arizona changes the answer

Most states have built something on top of the federal floor. Arizona has not.

Two Arizona specifics worth having in front of you:

• There is no birthday rule here. California, Oregon, Idaho, Nevada, Illinois, Louisiana, Maryland, Kentucky and Oklahoma are among the states with some version of an annual window around your birthday to change Medigap policies without underwriting. Arizona is not among them. If a friend or an article told you about it, they were describing a different state’s law.
• There is no under-65 access either. Arizona has not required insurers to sell Medigap to people on Medicare because of disability or ESRD, and as of 2026 none do voluntarily. That matters for a household where one spouse went on Medicare early.

What Arizona does have is a competitive market — a large number of insurers sell Medigap policies here, and because the benefits inside each plan letter are set by federal law, price and rate history are most of what separates them. That helps you enormously if you can get through the door.

The windows where the answer is yes, with no health questions

These are the federal guaranteed issue rights that come up in this market. In every one of them, you apply no more than 63 days after the old coverage ends — Medicare.gov’s own reminder — and you keep the letters, notices and emails that prove the situation, because the insurer will ask for them.

Sources: Medicare.gov guidance on when you can buy and when you can switch or drop a Medigap policy; CMS, Choosing a Medigap Policy. Federal rights only — states may add more, and Arizona has not.

That last row is where most people actually sit, and it is the honest answer to the search. The most common real fix in this market is the third row, because a permanent move is a genuine guaranteed issue event — and this is a county people move into.

The calendar: when you can change anything at all

Even where underwriting is not an obstacle, the switch itself has dates.

• October 15 – December 7 — Open Enrollment. Join, drop or switch an Advantage plan, or switch from an Advantage plan back to Original Medicare. The change takes effect January 1, and the plan must have your request by December 7.
• January 1 – March 31 — the Medicare Advantage Open Enrollment Period. Only for people already in an Advantage plan. You can change Advantage plans once, or drop back to Original Medicare and add a standalone drug plan. It takes effect the first of the month after the request is processed. Note what it does not do: it creates no Medigap guaranteed issue right by itself.
• A Special Enrollment Period. A permanent move, a loss of other coverage and a handful of other life events open one outside those windows. Which events qualify is worth knowing before you need it.

The full map of these dates is in Medicare enrollment periods. The one to circle right now is December 7, because a switch you want effective January 1 is decided in October and November, not in December.

What underwriting actually looks like

If you are outside a protected window, the Medigap application is a health application. Expect questions about diagnoses and treatment in recent years, hospital stays, procedures already scheduled, height and weight, tobacco use, and the medications you take — the drug list alone tells an underwriter a great deal.

The conditions that most often lead to a decline are consistent across the industry: current cancer treatment, oxygen use, dialysis or kidney failure, a recent heart attack or stroke, advanced COPD, insulin-dependent diabetes with complications, a recent hospitalization, or surgery on the calendar. Standards vary from one insurer to another, which is why “I was declined” is a reason to look at a different company rather than to give up — but it is not a reason to assume it will work out.

There is a second, quieter rule worth knowing: if you buy a Medigap policy with less than six months of prior creditable coverage behind you, the insurer may refuse to cover a pre-existing condition for up to six months, even after approving you.

The Peoria version of this question

Peoria runs nearly thirty miles north to south and the two ends ask this question for different reasons.

Up in 85383 — Vistancia, Trilogy, Blackstone, the newer stretch along Lake Pleasant Parkway — a lot of households arrived in the last few years. Two things follow from that. First, some of them are still holding a plan bought in another state, which is not a small technicality: if that plan does not serve Maricopa County, the move itself is a guaranteed issue event with a 63-day clock that has probably already started. Second, this is where the seasonal residents are, and a supplement’s biggest structural advantage is that Original Medicare has no network anywhere in the country. Somebody who spends four months a year out of state usually finds that a supplement plus a drug plan fits better than a plan drawn around Maricopa County providers.

Down in the 85345 core and around Westbrook Village, the households have been here longer and the driver is different — it is usually a specific doctor, or a specialist referral that got harder than expected. Worth knowing before you switch for that reason: specialist care for north Peoria runs to Arrowhead or down into Sun City, and how far a plan’s network reaches into those systems is a question you can answer without leaving the plan at all. How Advantage networks are drawn is often the cheaper fix.

And the seam does what the seam always does. Peoria, Glendale and Sun City sit close enough together that neighbors a mile apart compare notes and get different answers — different plans, different networks, different Medigap quotes at the same age. The Peoria page is the local one for this side of it; if you are across the line, start here.

The order of operations, which is the part people get wrong

Do these in this order. It is the single most useful thing on this page.

1. Decide whether you actually want Original Medicare plus a supplement. It is a different structure, not a better one — higher fixed premiums, essentially no surprises, no network, no referrals, and drug coverage bought separately. Advantage versus Medigap lays out both sides, and the Plan G versus Plan N comparison covers the choice most people end up making. Original Medicare on its own leaves you $1,736 per hospital benefit period and 20% of the Part B bill with no ceiling — the supplement is what closes that, and Plan G closes all of it except the $283 Part B deductible.
2. Find out whether you have a guaranteed issue right. A move, a plan exit, a first-year trial right. If you do, the 63-day clock is the only thing that matters and it is already running.
3. Apply for the Medigap policy and get it approved — before you touch the Advantage plan. This is the mistake that costs people the most. Disenroll first and get declined second, and you are on Original Medicare with no supplement and no way back until the next window.
4. Only then drop the Advantage plan, and line the effective dates up so there is no month with two premiums or no coverage.
5. Do not forget Part D. Leaving an Advantage plan that included drug coverage means you need a standalone drug plan, and going 63 days without creditable drug coverage starts a penalty that never goes away.

What to do between now and December 7

If you are thinking about this for 2027, the useful weeks are the ones in front of you, not the first week of December.

Your Annual Notice of Change arrives by the end of September and tells you what your current plan is doing next year — that document, not a mailer, is the reason to switch or stay. Before it comes, it is worth establishing which of the six rows in the table above you are in, because that single fact decides whether this is a scheduling exercise or a health-underwriting one.

If you want somebody to work that out with you — whether you have a guaranteed issue right, what a supplement would realistically cost at your age here, and whether your current plan is actually the problem — that is a short conversation. The office is in Anthem, about 25 minutes from north Peoria out the Carefree Highway and down Lake Pleasant Parkway, and most of this gets done by phone anyway. Call (602) 844-6002 or book a time. By calling or texting you agree to be contacted about your Medicare options; there is no cost and no obligation, and if the answer is that you are better off where you are, that is what you will hear.