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The envelopes start arriving about six months before your 65th birthday. By the twentieth one, your kitchen table is buried in glossy brochures promising $0 premiums, free dental, a gym membership and something called an “allowance,” and you still can’t explain to your sister what the difference is between the plans.
That’s the odd thing about shopping for medicare plans. The information isn’t hidden. It’s just relentless and unranked, so the loudest mailer wins instead of the policy that actually fits your doctors, your prescriptions and your budget.
Here’s the structure hiding underneath all that paper. Once you see how the pieces fit together, most of those brochures sort themselves into three or four buckets.
What “Medicare Plans” Actually Refers To
People use the phrase loosely, but it covers four different products that do four different jobs.
- Original Medicare: Part A for hospital stays and Part B for doctor visits, outpatient care, labs and equipment. Run by the federal government, accepted almost everywhere, and it covers roughly 80% of approved costs after deductibles.
- Medicare Advantage (Part C): Private insurance that delivers your Part A and B benefits, usually with drug coverage and extras bundled in. You stay in Medicare, but the plan sets the rules.
- Part D: Stand-alone prescription drug coverage, sold separately if you’re on Original Medicare.
- Medigap: Private supplemental insurance that pays a chunk of what Original Medicare leaves behind.
Notice that Advantage and Medigap are opposites. One replaces how you get your benefits; the other sits on top of them. You can’t productively buy both.
Two Roads, and Choosing One Is Hard to Undo
Nearly every decision comes down to a fork in the road.
Road one: Original Medicare plus Medigap plus a drug plan
You keep the government plan and buy two private products to plug the holes. A Medigap Plan G policy, for example, picks up nearly everything Original Medicare leaves behind once you’ve paid the Part B deductible ($257 in 2025). You can see any provider in the country who accepts Medicare. No networks, no referrals to see a specialist, no prior authorization for a procedure your doctor orders.
The trade-off is price. A 65-year-old might pay anywhere from $110 to $220 a month for Plan G depending on state, sex and tobacco use, on top of the $185 Part B premium and a drug plan. If you want the full breakdown of what each lettered plan covers and which ones are closed to new enrollees, this explanation of how Medigap fills the gaps in your coverage walks through it plan by plan.
Road two: Medicare Advantage
You assign your Medicare benefits to a private insurer. Plenty of plans advertise $0 monthly premiums (you still pay Part B), and many bundle drug coverage, dental, vision, hearing aids and an over-the-counter allowance. The catch is structure: you generally stay in a network, the plan can require prior authorization before approving care, and your yearly out-of-pocket exposure is capped but not small — $9,350 in-network for 2025.
Advantage plans can be excellent for someone healthy who wants predictable costs and extras. They can be miserable for someone who travels half the year or needs a specialist outside the network. If this road appeals to you, choosing the right Medicare Advantage plan comes down to three checks: doctors, drugs and the out-of-pocket maximum.
The Numbers That Matter More Than the Brochure
Ignore the headline premium for a minute. Five figures decide what a plan really costs you.
1. The monthly premium. Real, but rarely the biggest number.
2. The deductible. Part A runs $1,676 per hospital stay in 2025. Part B is $257. Advantage plans set their own, sometimes $0 for primary care.
3. Copays for care you’ll actually use. A $0 premium plan with a $65 specialist copay and a $350/day hospital stay is not cheap if you’re managing three chronic conditions.
4. The annual out-of-pocket maximum. This is your worst-case year. Original Medicare has no cap, which is the entire reason Medigap exists. Advantage plans do cap it, at $9,350 in-network in 2025, and some plans set it lower.
5. Drug costs, which deserve their own paragraph.
Prescriptions Require a Separate Afternoon
Formularies change every January. A plan that covered your inhaler last year can move it to a higher tier or drop it entirely. Before you enroll, pull up the plan’s formulary and search each drug by its exact name and dose, not the general category.
Watch for prior authorization requirements and quantity limits too. Blood thinners, injectable diabetes medications and inhalers are common culprits. Use the plan’s own pharmacy lookup rather than assuming your corner drugstore is in-network.
The 2025 rules help here. Part D now caps your out-of-pocket drug spending at $2,000 a year and lets you spread costs across monthly payments instead of one painful January bill. That cap makes the difference between two drug plans smaller than it used to be, but it doesn’t make formularies identical.
Deadlines, and the Penalty That Never Leaves
Your Initial Enrollment Period is a seven-month window: the three months before your 65th birthday month, that month, and the three after. Enroll late in Part B without other creditable coverage and you’ll pay a 10% surcharge for every 12 months you waited — permanently, for as long as you have Part B. Part D has its own penalty, 1% of the national base premium per month uninsured.
After that first year, the calendar looks like this: Medicare Open Enrollment runs October 15 to December 7 for changes starting January 1. The Medicare Advantage Open Enrollment Period runs January 1 to March 31 and lets you make one switch, but only if you’re already in an Advantage plan.
Medigap has a different clock, and it’s the one that catches people. Your six-month Medigap Open Enrollment Period starts the month you turn 65 and are enrolled in Part B. During those six months, insurers must sell you a policy regardless of health history. After that, in most states, they can ask about your health and decline you or charge more. If you’re leaning toward Road One, that window is the single most important date on your calendar.
Brand Names Tell You Less Than You’d Think
A familiar logo on the envelope is not a plan. Insurers like UnitedHealthcare and Humana sell dozens of distinct medicare plans, and the terms differ by county. Two plans from the same company in adjacent ZIP codes can have different networks, copays and drug lists.
So evaluate the plan, not the brand. If you’re comparing a specific carrier, this look at how UnitedHealthcare Medicare plans actually work is a useful reality check on networks and authorization rules. The same skepticism applies to Humana Medicare plan costs and enrollment details, where the extras vary considerably from one product line to the next.
Dental, Vision and Hearing: Read the Small Print
“Dental included” can mean a free cleaning twice a year and nothing else, or a $2,500 annual allowance. Cleanings are cheap; a crown or a bridge is not. If your teeth are the reason you’re eyeing an Advantage plan, check the annual maximum, the waiting period and whether major services like root canals and dentures are covered at all. A standalone policy sometimes makes more sense, and it’s worth learning how to choose a dental plan you’ll actually use before you let a $15-a-month bundled benefit sway a decision worth thousands.
A Method You Can Finish in One Afternoon
- Write down every doctor you see and the hospital or health system they’re tied to. Affiliations matter more than names.
- List each prescription with the exact dose and how often you fill it.
- Choose your road first — Medigap or Advantage — based on travel, specialists and how much uncertainty you can tolerate.
- Enter your doctors and drugs into the Medicare Plan Finder at medicare.gov and let it filter. Three plans is plenty to compare.
- Call each plan’s member services and ask two questions: is my cardiologist in network, and what does a three-day hospital stay cost me on this plan?
That last call is where the brochures fall apart and the real answer shows up. A licensed agent can run the same comparison, but they’re paid by the carriers and not every one sells all of them. Ask directly: “Do you represent every plan in my county?” The honest ones will tell you.
The One Question Worth Asking Yourself
Forget the free gym membership for a second. Sit with this: if you got seriously sick next year — a cancer diagnosis, a cardiac procedure, a broken hip — what would this plan cost you, and who would you be allowed to see?
If the answer is “a few thousand dollars at most, and anyone who takes Medicare,” you want Original Medicare with Medigap. If it’s “under ten grand, and my local hospital system is in network,” an Advantage plan is a reasonable bet, especially if the premium savings go into a savings account for the year you need it. Write the answer down. When the next brochure arrives with a bigger number in the corner, you’ll have something sturdier than a mailer to measure it against.
