By Margo Steinlage, Co-Owner, President and Independent Broker, Steinlage Insurance Agency, and Blaine Homan, CFP®, Mason Investment Advisory Services
Turning 65 brings a flood of Medicare decisions, and one of the biggest is choosing between a Medicare Supplement (Medigap) plan and a Medicare Advantage plan. It’s a choice that’s often made quickly, sometimes based on a low headline premium or a persuasive TV ad, without fully understanding that this decision can be difficult and costly to reverse later.
If you’ve already read our pieces on common Medicare enrollment questions and the IRMAA surcharge for high earners, this post takes the conversation a step further: what happens after you enroll, and why the path you choose at 65 deserves more scrutiny than it often gets.
The Core Trade-Off: Premium vs. Flexibility
Medicare Supplement and Medicare Advantage plans solve for different things, and understanding that trade-off is the foundation of this decision.
A Medicare Supplement plan carries a monthly premium, but in exchange, it covers care at close to 100%, nationwide, with any provider who accepts Medicare. If you have a difficult health year, a supplement plan generally limits your out-of-pocket exposure significantly, with very few restrictions on where or how you get care.
A Medicare Advantage plan flips that structure. Premiums are often low, sometimes $0, depending on your plan and zip code. Most HMOs and many PPOs available nationwide tend to carry no monthly premium at all. But the savings on the front end come with conditions on the back end: when you actually need care, whether it’s a doctor visit, an ER trip, or surgery, you’re typically responsible for deductibles, co-pays, or co-insurance up to your plan’s out-of-pocket maximum.
What “Free” Medicare Advantage Really Means
Advertising for Medicare Advantage often emphasizes that everything is covered, free Part C, no cost to you. That framing leaves out important context. Choosing a Supplement plan means paying a monthly premium with the understanding that if you get sick, you’re covered at almost 100%, nationwide. Choosing Advantage means a lower (or no) premium upfront, but cost-sharing kicks in once you need services.
Neither approach is inherently better. The right fit depends on your risk tolerance, your health history, and how much certainty you want around your healthcare costs.
Network Restrictions: The Detail Many People Miss
One of the most overlooked aspects of Medicare Advantage plans is the network structure. HMO and PPO plans generally require you to stay in-network for full coverage.
With an HMO, going out of network for non-emergency or non-urgent care can leave you responsible for the entire cost. That matters more than people expect; if you ever need specialized cancer treatment at a center like Mayo Clinic, or need to travel for out-of-network care, you could be fully on the hook for those costs.
PPOs offer more flexibility. You’ll pay co-pays for in-network services, with higher co-insurance and co-pays for going out-of-network. Out-of-pocket maximums for out-of-network care on a PPO typically fall between $7,000 and $10,000 per year.
The Real Risk: What Happens If You Want to Switch Back
This is the part of the decision that gets the least attention, and arguably matters the most.
If you enroll in a Medicare Advantage plan and later decide you want to move back to a Supplement plan, perhaps because you’ve started hitting your out-of-pocket maximum year after year, or because you want more flexibility for specialized treatment, that move requires medical underwriting.
In practice, that means your prospective Supplement carrier will review your medical history (often going back as far as five years), any pending or anticipated services, and your current medications. Based on that review, the carrier assesses your health risk and can do one of a few things: deny you coverage outright, accept you at a higher premium, or accept you at the standard rate, depending entirely on your health profile at that time.
This is the crux of why the decision at 65 carries long-term weight. If your health changes between your initial enrollment and the point where you want to switch back, you may find yourself locked into a Medicare Advantage plan well past the point where it still fits your needs.
Why Some Medicare Advantage Plans Look Better Early On
It’s also worth noting that Medicare Advantage plans sometimes include added value early on, such as preventative dental, vision, or hearing coverage bundled in at a low premium. These features can make a plan feel like an easy win in year one. The consideration isn’t whether those features have value; it’s whether your overall plan choice will still serve you well several years down the road, particularly if your healthcare needs increase.
There’s No Universal Right Answer, Only the Right Fit for You
Some people are comfortable with higher cost exposure in exchange for a lower monthly premium. Others place a higher value on predictable, headache-free coverage and are willing to pay more upfront for that certainty. Both are reasonable approaches, and the right one depends on your personal financial situation, health outlook, and comfort with risk and complexity.
What matters most is that the decision is an informed one, made with a full understanding of both the upfront and long-term implications, rather than a decision driven solely by a low advertised premium.
Work With a Team That Sees the Whole Picture
At Mason, our advisors work alongside Medicare specialists like Margo Steinlage to help clients make decisions that account for the full picture: income, taxes, Medicare costs, and long-term financial goals. We have helped clients file SSA-44 appeals, model the IRMAA impact of Roth conversions, and structure retirement income to minimize unnecessary premium exposure.
For Medicare coverage questions and guidance, contact Margo Steinlage at Steinlage Insurance Agency: margo@steinlageinsurance.com.
Have questions about how your Medicare Supplement or Medicare Advantage plan fits into your broader financial picture?
- For more on enrollment timing and key decisions, read our guide on Medicare enrollment questions.
- If you’re a high earner navigating premium surcharges, see our breakdown of IRMAA and the hidden Medicare surcharge.
- Or click here to schedule a consultation with a Mason advisor >>
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Frequently Asked Questions
Can I switch from Medicare Advantage back to a Medicare Supplement plan?
Yes, but the switch requires medical underwriting in most cases. The Supplement carrier will review your health history, pending care needs, and medications, and may approve you at standard rates, approve you at a higher premium, or deny coverage based on your health risk.
Why do Medicare Advantage plans have low or no premiums?
Lower premiums reflect a different cost-sharing structure. Instead of paying more upfront, you generally pay deductibles, co-pays, or co-insurance when you actually use care, up to your plan’s annual out-of-pocket maximum.
What’s the difference between an HMO and a PPO under Medicare Advantage?
HMOs generally require you to stay in-network, and going out-of-network for non-emergency care can leave you responsible for the full cost. PPOs offer more flexibility to go out-of-network, with higher co-insurance and co-pays, and an annual out-of-pocket maximum typically between $7,000 and $10,000.
Is a Medicare Supplement plan better than Medicare Advantage?
Neither is universally better. Supplement plans offer broader nationwide coverage with fewer restrictions, in exchange for a consistent monthly premium. Medicare Advantage plans offer lower upfront costs with network restrictions and cost-sharing when care is used. The better fit depends on individual health needs, risk tolerance, and financial priorities.
When can I make changes to my Medicare coverage?
The Annual Enrollment Period runs from October 15 through December 7 each year, with changes taking effect on January 1. This is the window to shop Part D drug plans, Medicare Advantage plans, or move between Supplement and Medicare Advantage coverage. Remember movement from Medicare Advantage to Supplement will generally trigger Medical Underwriting in most states.
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The information in this article is for educational purposes only and does not constitute financial, legal, or tax advice. Please consult a qualified Medicare specialist and financial advisor regarding your specific situation.
