Medicare Supplement vs. Medicare Advantage in Washington: How to Actually Decide
There's no shortage of opinions on this one.
Ask one person and they'll tell you Medicare Advantage is a scam. Ask another and they'll tell you Supplements are a waste of money. Both are wrong — and both are right, depending on the person.
This post isn't going to tell you which one is better. It's going to help you figure out which one is right for you — based on your doctors, your health, your budget, and how you actually want to use your coverage.
If you're approaching Medicare in Washington and this decision is in front of you, here's how to think through it.
First — What Are You Actually Choosing Between?
When you sign up for Medicare, you have two main paths:
Path 1 — Original Medicare + Supplement + Part D
You stay on Original Medicare (Parts A and B), add a Medigap plan to cover the gaps Original Medicare leaves behind, and add a separate Part D plan for prescriptions. Most people on this path choose Plan G or Plan N — you can compare Plan G and Plan N in Washington to see which fits better.
Path 2 — Medicare Advantage (Part C)
You enroll in a private plan that replaces Original Medicare entirely. These plans bundle hospital, medical, and usually drug coverage together. Most have a $0 or low monthly premium on top of your Part B.
Both paths are legitimate. Both have real tradeoffs. The right one depends on five things.
How to Actually Decide: 5 Questions
1. Do you have doctors you're not willing to leave?
This is the first question — and for many Washington residents, it settles the decision on its own.
With a Medicare Supplement, you can see any doctor in the country who accepts Medicare. No referrals. No network approval. You show your Medicare card and you're covered.
With Medicare Advantage, your coverage is tied to a plan network. In Washington, networks vary significantly by county and plan. Some plans offer PPO structures with out-of-network access at higher cost. Others are strict HMOs — go outside the network and you pay full price.
If you have a specialist, a surgeon, or a primary care doctor you've seen for years and you want to keep them, check whether they're in the plan's network before you enroll — not after.
If provider flexibility matters to you, the Supplement path gives you the most freedom.
2. How predictable do you need your monthly costs to be?
This is the core financial tradeoff between the two paths.
With a Supplement, your monthly cost is higher and fixed. Plan G in Washington typically runs $230–$350/month depending on the carrier, and Plan N runs $178–$250/month — both plus your Part B premium and a separate Part D plan. You pay more every month — but when you use care, you pay little to nothing out of pocket.
With Medicare Advantage, your monthly plan premium is often $0 — you just pay your Part B premium. But when you use care, costs add up through copays, deductibles, and coinsurance. The annual out-of-pocket maximum in 2026 can be as high as $9,250 for in-network care.
Neither structure is a trap. But they suit different people.
If you're someone who wants to know exactly what healthcare will cost every month regardless of what happens — the Supplement path is built for that.
If you're comfortable with low fixed costs and some variability when you actually need care, Advantage can work well — especially if you're generally healthy.
3. How much do you travel — or plan to?
If you spend part of the year in Arizona, drive across the country, or visit family in another state regularly, this matters more than most people realize.
Supplements work everywhere Medicare is accepted — nationwide, no questions asked.
Most Medicare Advantage plans are geographically tied. HMOs in particular cover out-of-area care only in emergencies. PPOs offer more flexibility but at higher out-of-pocket cost. If you're far from home and need care, your Advantage plan may not cover it the way you'd expect.
For travelers and snowbirds, the Supplement path almost always makes more sense.
4. What does your health history look like?
This is the honest question most people avoid.
If you're healthy today and expect to stay that way, Medicare Advantage can look very attractive. Low monthly cost, extra benefits, manageable copays for routine care.
But here's what changes the math: if you develop a serious condition — cancer, heart disease, a major surgery — your out-of-pocket costs under Advantage can accumulate quickly. Copays per hospital day, specialist visits, ongoing treatments — they add up against that $9,250 annual maximum.
Under a Supplement, those same costs are mostly covered. Your monthly premium stays the same regardless of how sick you get.
There's one more layer to this in Washington specifically. If you start on Advantage and want to switch to a Supplement later — after a health event — you may need to answer medical questions to qualify. Depending on what's happened, you may not be approved. Washington's flexible switching rules apply to Supplement-to-Supplement switches, not Advantage-to-Supplement switches.
That's a risk worth weighing carefully upfront.
5. Do you want one card that handles everything, or are you comfortable managing separate plans?
This is a lifestyle question, not a financial one — but it matters.
Medicare Advantage bundles everything together. One plan, one card, one set of rules to learn. For people who want simplicity, that's genuinely appealing.
The Supplement path means managing three separate pieces — Medicare, a Medigap plan, and a Part D plan. Three different premiums, potentially three different companies. It's not complicated once it's set up, but it requires more initial coordination.
Neither is wrong. It just depends on how you prefer to manage things.
A Side-by-Side Summary
| Feature | Medicare Supplement (Medigap) | Medicare Advantage (Part C) |
|---|---|---|
| Monthly premium | Higher ($140–$260/mo in WA) | Lower (often $0–$30/mo) |
| Doctor networks | Any doctor accepting Medicare — no networks | Network required (HMO or PPO) |
| Out-of-pocket costs | Predictable — plan covers most gaps | Variable — depends on care used |
| Prescription coverage | Separate Part D plan required | Usually included |
| Extra benefits | None beyond Medicare | Often includes dental, vision, hearing |
| Prior authorization | Not required | Required for many services |
| WA switching rights | Any time, guaranteed issue | Annual enrollment period only |
| Travel coverage | Nationwide Medicare coverage | Network restrictions apply |
| Best for | Frequent care, travel, predictability | Generally healthy, low care usage |
What Washington Residents Should Know Specifically
Two things about Washington that don't apply in most other states:
Community rating. Washington requires Medigap insurers to charge the same premium regardless of your age at 65 or older. You won't pay more just because you're 72 instead of 65. That's not true in most states.
Supplement switching flexibility. In Washington, you can switch from one Supplement plan to the same plan letter at any time without answering health questions. If your premium gets too high, you can shop for a better-priced version of the same coverage without starting over medically. That flexibility reduces the risk of the Supplement path considerably.
Frequently Asked Questions
What is the biggest difference between Medicare Supplement and Medicare Advantage in Washington?
Which plan is more popular in Washington State?
Can I have both Medicare Supplement and Medicare Advantage at the same time?
Is it hard to switch from Medicare Advantage to Medicare Supplement in Washington later?
The Bottom Line
This decision comes down to a simple tradeoff: do you want lower monthly costs with some variability when you use care — or higher monthly costs with more predictability and freedom?
Neither answer is wrong. The mistake is choosing without thinking it through.
If you'd like to walk through your specific situation — your doctors, your prescriptions, your county in Washington — I'm happy to spend 10–15 minutes looking at both sides with you. No products pushed. You'll leave with a clear picture of what each path actually costs in your situation.
Have questions about your specific situation?
Join Michael's free Facebook group — "Turning 65 in Washington State" — where Washington residents get clear Medicare answers without the sales pitch.
Join the group →Michael Gurr is a licensed Medicare and retirement advisor serving Pierce County and Washington State.
Still weighing Supplement vs. Advantage?
As a licensed Medicare advisor in Washington State, I'll walk through your doctors, prescriptions, and budget so you can see which path actually fits. No products pushed. Just clarity.
There's no charge to talk and no obligation to decide. If it's not the right fit, I'll tell you that too.