Medicare at 65: Advantage vs. Supplement — Which Plan Is Right for You?
Medicare at 65: Advantage vs. Supplement — Which Plan Is Right for You?
By Rod Cummings, RSSA® | Legacy Wealth Services | Happy Valley, Oregon
The birthday card arrives. Then the Medicare mailings start — dozens of them. By the time you turn 65, your mailbox (and inbox) may be overflowing with Medicare plan options, each claiming to be the best choice for your retirement years.
Here’s the truth: there is no universally “best” Medicare plan. But there is a best plan for you — based on your health, your doctors, your finances, and how you live your retirement. This guide will walk you through Medicare’s four parts in plain language, explain the critical difference between Medicare Advantage and Medicare Supplement, and give you a clear framework to make your decision with confidence.
First: The Medicare Enrollment Window You Cannot Miss
When you turn 65, you have a 7-month Initial Enrollment Period — three months before your birthday month, your birthday month itself, and three months after. Enrolling late without a qualifying exception triggers permanent late-enrollment penalties on your Part B premium (10% per 12-month period you were uninsured) and Part D premium.
If you’re still working and covered by an employer plan with 20+ employees, you may be able to delay without penalty. Otherwise, mark your calendar and enroll on time.
Still working past 65? Planning your Social Security claiming date alongside your Medicare start date is critical — they interact in ways that can save or cost you thousands. Learn how a Social Security analysis can optimize your retirement income →
Medicare’s Four Parts: A Plain-Language Breakdown
Medicare Part A — Hospital Insurance
What it covers: Inpatient hospital stays, skilled nursing facility care (after a qualifying hospital stay), hospice, and some home health services.
What it costs: Most people pay $0 in premiums for Part A if they (or their spouse) worked and paid Medicare taxes for at least 10 years. The 2026 inpatient hospital deductible is $1,676 per benefit period.
Medicare Part B — Medical Insurance
What it covers: Doctor visits, outpatient procedures, preventive screenings, lab work, durable medical equipment, and mental health services. Essentially: everything that happens outside a hospital.
What it costs: The standard 2026 Part B premium is $185.00/month, with a $257 annual deductible. After the deductible, Medicare pays 80% and you pay 20% — with no annual cap on your share of costs.
That unlimited 20% coinsurance is exactly why most people need additional coverage beyond Original Medicare (Parts A & B alone).
Medicare Part C — Medicare Advantage
What it is: Instead of receiving benefits through Original Medicare, you enroll in a private insurance plan that replaces your Medicare. The plan must cover everything Medicare does — and most bundle in drug coverage plus extras like dental, vision, and hearing.
How it works: Most Advantage plans use HMO or PPO networks. HMO plans require you to use in-network providers and get referrals to see specialists. PPO plans offer more flexibility — you can see out-of-network providers, though at higher cost.
Medicare Part D — Prescription Drug Coverage
What it covers: Prescription medications, covered through a standalone drug plan (if you have Original Medicare) or bundled into a Medicare Advantage plan.
What it costs: Average 2026 Part D premium is around $46/month, though plans vary widely. A key 2026 update: the Medicare prescription drug cap means you’ll never pay more than $2,000 out-of-pocket for covered medications in a calendar year.
Medicare Advantage vs. Medicare Supplement: The Core Difference
Once you understand the four parts, the key decision for most people turning 65 comes down to this: Medicare Advantage (Part C) or Medicare Supplement (Medigap)?
These two options represent fundamentally different philosophies:
| Medicare Advantage | Medicare Supplement | |
|---|---|---|
| How it works | Replaces Original Medicare | Works alongside Original Medicare |
| Doctor choice | In-network providers only (HMO/PPO) | Any provider that accepts Medicare — nationwide |
| Monthly premium | Often $0–$30/mo (+ Part B) | ~$100–$180/mo (+ Part B) |
| Annual out-of-pocket max | Up to $9,350 in-network (2026) | ~$257 (Part B deductible only, with Plan G) |
| Extra benefits | Often includes dental, vision, hearing | Not included |
| Referrals needed | Usually yes (HMO) | Never |
| Part D drug coverage | Usually bundled | Requires a separate Part D plan |
| Travel coverage | Emergency only outside service area | Covered anywhere Medicare is accepted |
The Real Cost Question: Which Is Cheaper?
The honest answer: it depends on your health.
In a low-utilization year (annual checkups, a few specialist visits), Medicare Advantage’s $0 monthly premium looks attractive. You might spend $800–$1,500 in copays while someone on Medigap Plan G spends $4,300+ in premiums alone.
In a high-utilization year (surgery, cancer treatment, extended recovery), the math flips dramatically. A Medicare Advantage enrollee could hit $9,350 in out-of-pocket costs — on top of their Part B premium. A Medigap Plan G enrollee’s exposure is limited to the $257 Part B deductible, regardless of how much care they receive.
The bottom line: Medicare Supplement offers predictability. Medicare Advantage offers lower premiums in healthy years. Your risk tolerance and health trajectory should guide which matters more to you.
Who Is Medicare Advantage Best For?
Medicare Advantage tends to be a strong fit if you:
- Are generally healthy and rarely need specialist care
- Want dental, vision, and hearing benefits bundled into one plan
- Prefer a $0 or low monthly premium and are comfortable with cost-sharing when you need care
- Have doctors and hospitals you like that are in-network for local plans
- Plan to stay in one geographic area year-round
Watch out for: Network restrictions, prior authorization requirements for procedures, and the risk of higher costs if a serious illness or injury occurs. Always verify your current doctors are in-network before enrolling.
Who Is Medicare Supplement Best For?
Medicare Supplement (Medigap) is often the better choice if you:
- Have ongoing health conditions or anticipate significant medical needs
- Want the freedom to see any doctor or specialist nationwide without referrals
- Travel frequently or split time between states
- Value cost predictability and want to budget your healthcare expenses reliably
- Have adequate monthly income to cover the higher premiums comfortably
The most popular plan for new enrollees is Plan G, which covers virtually every Medicare cost-sharing gap except the $257 Part B deductible. With Plan G, once you’ve paid your premium and that $257, your covered healthcare is essentially free for the rest of the year.
A Note on the Decision’s Permanence
Medicare Advantage plans offer annual switching during Open Enrollment (October 15 – December 7). If your plan’s network or costs change, you can switch next year.
Moving from Advantage back to a Medigap plan is trickier — in most states, insurers can require medical underwriting outside your initial enrollment window, meaning a serious diagnosis could prevent you from qualifying or make premiums prohibitively expensive.
This asymmetry matters: starting with Medigap and moving to Advantage later is generally easier than the reverse. It’s worth factoring into your initial decision.
Don’t Make This Decision Alone
The right Medicare choice at 65 sets the financial foundation for your entire retirement healthcare experience. The wrong choice — based on the lowest premium or the most colorful mailer — can cost you far more over time.
At Legacy Wealth Services, we work with a wide portfolio of carriers offering both Medicare Advantage and Supplement plans. As independent advisors, we’re not tied to any single carrier — our only job is to match you with the plan that fits your situation.
And because Medicare doesn’t exist in a vacuum, we also integrate your coverage decision with your Social Security strategy, your life insurance review, and your broader retirement income plan. When you see your retirement benefits as a coordinated system — not isolated products — better decisions follow.
Ready to find your best Medicare option for 2026? Our independent Medicare specialists compare plans across multiple carriers at no cost to you.
Have questions about when to claim Social Security alongside your Medicare enrollment? A Social Security analysis (RSSA) can show you the optimal strategy — including how your Medicare premiums are affected by your income and claiming age.
Rod Cummings is an independent insurance and retirement planning specialist serving clients throughout Oregon and beyond. This content is for educational purposes only and does not constitute personalized financial or insurance advice.