Medicare Advantage vs Supplement in Arizona
Two different ways to fill the gaps in Original Medicare. One trades a lower monthly cost for a network and copays; the other trades a higher premium for predictability and freedom. Here is how to decide in Arizona, where switching back later can be hard.
A Medicare Supplement (Medigap) keeps Original Medicare and pays most of what it leaves to you, so you can see any provider that accepts Medicare, with a higher monthly premium and very low costs when you get care. A Medicare Advantage plan replaces Original Medicare with a private plan that uses a network, usually includes drug coverage and extras, often has a low or $0 plan premium, and charges copays up to a yearly out-of-pocket maximum. Neither is right for everyone. In Arizona the decision carries extra weight, because there is no birthday rule or yearly window to move back to a supplement without health questions.
What each one actually is
Medicare Advantage (Part C) changes who pays your claims. A private company approved by Medicare takes over your Part A and Part B benefits, usually adds Part D drug coverage, and often adds dental, vision, hearing or fitness benefits. You use the plan's network and pay copays or coinsurance as you go, up to the plan's annual maximum out-of-pocket.
A Medicare Supplement does the opposite. You keep Original Medicare exactly as it is, and the supplement pays some or all of the deductibles and 20 percent coinsurance Medicare leaves to you. There is no network: any doctor or hospital in the country that accepts Medicare works. Drug coverage is not included, so you add a standalone Part D plan.
These are not two versions of the same product. They are built differently, so the useful comparison is your total expected cost for a year, plus how much uncertainty you are willing to carry.
The trade-off, side by side
| Medicare Advantage | Medicare Supplement + Part D | |
|---|---|---|
| Monthly premium | Often a $0 plan premium, plus your Part B premium | A Medigap premium and a Part D premium, plus your Part B premium |
| Doctor choice | Plan network; HMO plans often need referrals | Any provider nationwide who accepts Medicare |
| Cost when you use care | Copays and coinsurance each time | Little or nothing, depending on the plan letter |
| Worst-case year | Up to the plan maximum out-of-pocket for medical care | Mostly predictable; the premiums are most of it |
| Drug coverage | Usually built in | Separate Part D plan |
| Dental, vision, hearing extras | Often included, varies by plan | Not included; can add standalone policies |
| Prior authorization | Common for some services | Original Medicare rules only |
| Changing later in Arizona | Can switch each Annual Enrollment Period | May require health questions after your first window |
What the 2027 plans look like in Maricopa and Pinal
According to the CY2027 CMS Landscape file, Maricopa County has 52 Medicare Advantage plans (not counting Special Needs Plans) from 13 insurance companies. 50 of them have a $0 Part C premium and 39 have a $0 total premium including the drug portion. Their in-network out-of-pocket maximums run from $2,000 to $8,900, averaging about $4,896.
Pinal County has 47 plans from 10 companies, 45 with a $0 Part C premium and 35 with a $0 total premium, and maximums from $2,000 to $8,900, averaging about $4,980. Of the plans with a 2026 star rating, the highest locally is 4.5 stars.
A $0 premium is not the same as $0 cost. You still pay the Part B premium, and you pay copays when you use care. The out-of-pocket maximum is the number that tells you what a hard year could cost.
The Arizona rule that changes the math
You get one six-month Medigap Open Enrollment Period, starting when you are 65 and enrolled in Part B. During it you can buy any Medigap plan sold in Arizona regardless of health. After it closes, a company can usually ask health questions and turn you down, unless you have a federal guaranteed-issue right.
Some states add a yearly birthday or anniversary window that lets people change supplements without health questions. Arizona does not (NAIC state chart, as of May 11, 2026). So choosing Advantage at 65 and moving to a supplement at 72 may not be possible if your health has changed.
This is not an argument for one side. It is a reason to decide carefully at 65, when both doors are open.
Questions that point one way or the other
- Do you have specialists or a hospital system you would not want to give up? Freedom of choice points toward a supplement; a plan whose network includes them can work too.
- Do you spend part of the year outside Arizona? A supplement works anywhere in the country; most Advantage networks are local, with emergency and urgent care covered elsewhere.
- Would an out-of-pocket year of several thousand dollars be a real hardship? Predictability has a price, and it may be worth paying.
- Do you use little care and want to keep monthly costs down? A Medicare Advantage plan may serve you well.
- Do the dental, vision and hearing extras matter to you, and how do they compare with a standalone plan?
- Do you take expensive brand-name drugs? The Part D side may matter more than the medical side.
- Do you qualify for AHCCCS or Extra Help? Special Needs Plans and extra enrollment chances may change the picture entirely.
Compare total cost, not just the premium
A supplement premium looks expensive next to a $0 Advantage premium, and on its own that comparison tells you very little. Add up a quiet year and a hard year for each option.
For a supplement, a quiet year is twelve months of premiums for the Medigap policy and the Part D plan, plus the $283 Part B deductible in 2026 if you choose Plan G. A hard year is nearly the same, because the supplement absorbs most of the cost.
For a Medicare Advantage plan, a quiet year is a few copays. A hard year can approach the plan's out-of-pocket maximum for medical care, plus drug costs up to the Part D cap, which is $2,400 in 2027 (CMS CY2027 Rate Announcement).
When you lay those four numbers side by side for your own situation, the decision usually becomes much clearer.
How we help East Valley clients decide
At Rise Up Benefits Group we start with your doctors, your prescriptions and how you live, not with a plan. We check networks and formularies for the plans we offer in your county, show you the quiet year and the hard year for each option, and explain the Arizona Medigap rules before you commit. We do not offer every plan available in your area, and Medicare.gov or 1-800-MEDICARE can show you all of your options.
The bottom line
Medicare Advantage trades a low premium for a network and copays up to a cap; a Medicare Supplement trades a higher premium for freedom and predictability. In Arizona, the supplement decision is hardest to reverse, so make it deliberately during your first six months on Part B. Write down your doctors, your drugs and your worst-case budget, and compare total cost for a quiet year and a hard year.
Want to go through this with someone?
Viola Lucero and the Rise Up Benefits team in Chandler will go through your doctors, your prescriptions and your real numbers, and explain plainly what we found. We speak insurance, so you don't have to.
Prefer to learn in a group? See our Medicare workshops online or in Chandler, the events calendar, and official CMS videos and forms on our Resources page.
Sources
- CMS Medicare Advantage and Part D Landscape, contract year 2027 (Maricopa and Pinal counties, Arizona), Centers for Medicare & Medicaid Services
- State Medigap rules: birthday rule and coverage under 65 (as of May 11, 2026), National Association of Insurance Commissioners
- 2026 Medicare Parts A and B premiums and deductibles, Centers for Medicare & Medicaid Services
- CY2027 Medicare Advantage and Part D Rate Announcement, Centers for Medicare & Medicaid Services
Please note: We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov, 1-800-MEDICARE, or your local State Health Insurance Program (SHIP) to get information on all of your options. Rise Up Benefits Group is not connected with or endorsed by the United States government or the federal Medicare program. Medicare has neither endorsed nor reviewed this information.