Every fall my patients start bringing the mailers to their appointments. The glossy ones promise dental coverage, gym memberships and a low or zero premium; the plainer ones explain Medigap. The question is always some version of "Which one should I pick?"
I can't choose a plan for you, and I'm not an insurance advisor. But I see what each choice changes about how care actually works once you're sick, on five medications, and seeing three specialists. That side of the decision rarely makes it into the advertising, so here it is from the doctor's side of the desk.
The Short Version
Medicare's own comparison lays out the structural differences plainly:
- Original Medicare lets you use any doctor or hospital that takes Medicare, anywhere in the U.S. In most cases you don't need a referral to see a specialist, and you don't need prior authorization for covered services. There is no yearly limit on what you pay out of pocket, which is why many people add a Medigap supplement and a separate Part D drug plan.
- Medicare Advantage plans are run by private insurers under Medicare's rules. You may need to use doctors in the plan's network, get a referral to see a specialist, and get the plan's approval before certain services. Plans do have a yearly out-of-pocket limit, most include drug coverage, and many add extras such as some vision, hearing and dental services.
Neither is the right answer for everyone. What matters is how those rules land on your particular health, doctors and calendar.
What Changes About Choosing and Keeping Your Doctor
Networks decide who you can see
With Original Medicare, the question is simply whether a doctor accepts Medicare. With an Advantage plan, the question becomes whether that doctor is in that specific plan's network for that specific year. Two plans from the same insurer can have different networks, and a practice can participate with one and not the other.
The doctor listed on your card matters
Many Advantage plans, especially HMO-style plans, ask you to name a primary care doctor. If the plan has someone else on file, referrals from the doctor you actually see can be rejected and claims can bounce. When you enroll, make sure the plan lists the doctor you intend to keep, and check your new card when it arrives.
Networks change every year
A doctor who is in network this year is not guaranteed to be next year. Provider directories also lag behind reality. Before you enroll, call the office itself and ask whether it will be in network for the plan you are considering for the coming year, not just whether it takes that insurer.
Referrals, Prior Authorization, and the Paperwork in Between
Referrals and prior authorization are not a reason to avoid Medicare Advantage, but they are real, and they are felt most by people who see several specialists. A referral is usually our office telling the plan that a specialist visit is needed. Prior authorization is the plan agreeing in advance to cover a test, a procedure or a medication, and it can add days to getting imaging scheduled or a new prescription filled.
If you manage a heart rhythm problem such as atrial fibrillation, see a cardiologist and a pulmonologist, and get regular imaging, count how many of those steps would need a plan's sign-off. Our guide to whether you need a referral to see a specialist walks through how that works, and who is coordinating your care across several specialists explains why a primary care home matters even more under a plan with these rules.
Your Prescriptions Follow the Plan's Formulary
Whichever path you choose, your drug coverage runs through a formulary, the plan's list of covered drugs and the tier each one sits on. Formularies differ between plans and change from year to year. A blood thinner like apixaban, a long-acting insulin like insulin glargine for diabetes mellitus, or an inhaler for COPD can land on very different tiers from one plan to the next.
Before you enroll, enter every medication you take, with the exact dose, into Medicare's Plan Finder on Medicare.gov and compare what each plan would actually cost you over the year. Bring your current medication list from our office so nothing gets left out.
If You Split the Year Between Florida and Somewhere Else
Many of our patients spend part of the year up north. Original Medicare works with any doctor who takes Medicare anywhere in the country, which makes it simpler for people who live in two places. Many Advantage networks are built around one region, so routine care in your other home may be out of network. Some plans handle travel better than others; ask each plan exactly how it covers non-emergency care outside its service area before you choose. Our guide to primary care for snowbirds covers the rest of the two-state logistics.
Switching Back Is Not Always Simple
This is the part I most want people to understand before they leave Original Medicare. You get a six-month Medigap open enrollment period that starts the first month you have Part B and are 65 or older. After that period, Medicare.gov warns, you may not be able to buy a Medigap policy, or it may cost more, and an insurer can deny you a policy if you don't meet its medical underwriting requirements. There are situations, called guaranteed issue rights, where an insurer can't deny you, but they are specific.
In practice, that means someone who joins an Advantage plan while healthy and wants to return to Original Medicare years later, after a heart attack or a cancer diagnosis, may find a supplement hard to get or expensive. If there's a chance you'll want to switch back, get advice on your guaranteed issue rights before you leave.
The Dates That Matter
Medicare's enrollment rules give you two main windows once you're already on Medicare:
- October 15 to December 7: join, drop or switch Advantage plans, or move between Original Medicare and Medicare Advantage. Changes take effect January 1.
- January 1 to March 31: if you're in an Advantage plan, you can switch to another Advantage plan, or drop it and return to Original Medicare and join a separate drug plan. Coverage starts the first of the month after the plan gets your request.
Questions to Ask Before You Choose
- Will my primary care doctor be in this plan's network next year? Ask the office, not just the directory.
- Are my specialists and the hospital I'd want to use in network?
- Is every medication I take on the formulary, and at what tier?
- How does the plan handle care in my other state, if I have one?
- What will I do for a supplement if I want to return to Original Medicare later?
For free, unbiased help comparing plans, Florida's state health insurance assistance program, SHINE (Serving Health Insurance Needs of Elders), offers one-on-one counseling from trained volunteers.
How We Can Help
We accept Medicare and most major insurance plans, but whether we participate with a particular Advantage plan varies by plan and by year. Before you enroll, call us at (727) 820-7800 to confirm whether we'll be in network for the specific plan you're considering. We're happy to give you a current list of your diagnoses, medications and specialists to take to a SHINE counselor, and your Medicare Annual Wellness Visit is a good time to review it together.
If you're looking for a doctor to anchor your care on either path, learn more about primary care at Zimmer Medical Group or request an appointment.
