Medicare Supplement Plans (Medigap) — Clear, Predictable Coverage
Medicare supplement plans — also called Medigap — help cover the gaps in Original Medicare. Designed for people who want stability, flexibility, and predictable out-of-pocket costs.
No pressure. No obligation. Just clarity.
What Are Medicare Supplement Plans?
Original Medicare (Parts A and B) doesn’t cover everything. You’re still responsible for:
Deductibles
Coinsurance
Copays
No Out-of-Pocket Maximum
A Medicare supplement plan helps pay some or most of those remaining costs.
Medigap plans work alongside Original Medicare — not instead of it.
How Medicare Supplement Plans Work
Here’s how Medigap integrates with Original Medicare, step by step:
You stay enrolled in Original Medicare (Parts A & B)
Medicare pays its portion first
Your supplement plan pays its portion second
You pay little or nothing for covered services, depending on your plan
You can see any doctor nationwide that accepts Medicare.
No referrals. No provider networks.
What Do Medigap Plans Cover?
Coverage varies by plan letter, but may include:
Plan benefits are standardized by the federal government.
What that means:
Plan G from one carrier provides the same medical benefits as Plan G from another carrier.
The main difference between carriers is premium and service. Compare all of them on Medicare.gov.
Plan G vs Plan F vs Plan N — Which Is Right?
These are the three most popular medicare supplement plans. Each covers a different combination of Medicare gaps — here’s exactly what each one does and doesn’t cover.
| Benefit | Plan GMost Popular | Plan FPre-2020 Only | Plan NLower Premium |
|---|---|---|---|
| Part A hospital coinsurance & costs | ✓ | ✓ | ✓ |
| Part B coinsurance or copay | ✓ | ✓ | Copays up to $20 ER visits up to $50 |
| Blood (first 3 pints) | ✓ | ✓ | ✓ |
| Part A hospice coinsurance | ✓ | ✓ | ✓ |
| Skilled nursing facility coinsurance | ✓ | ✓ | ✓ |
| Part A deductible | ✓ | ✓ | ✓ |
| Part B deductible$257 in 2025 — the key G vs F difference | ✕ | ✓ | ✕ |
| Part B excess charges | ✓ | ✓ | ✕ |
| Foreign travel emergency | 80% up to plan limits | 80% up to plan limits | 80% up to plan limits |
| Best for | Most people new to Medicare — best overall value | Those eligible before Jan 1, 2020 wanting zero out-of-pocket | Healthy enrollees who want the lowest premium |
Plan G
Most PopularCovers nearly everything except the annual Part B deductible ($257 in 2025). For most people turning 65 today, Plan G offers the best balance of coverage and cost. Premium savings over Plan F typically exceed the deductible amount.
Plan F
Pre-2020 Eligible OnlyThe most comprehensive Medigap plan — covers everything including the Part B deductible. Only available if you were Medicare-eligible before January 1, 2020. If you qualify, compare Plan F premiums carefully against Plan G.
Plan N
Lower PremiumLower monthly premiums in exchange for small copays at office visits (up to $20) and ER visits (up to $50). A smart fit if you’re generally healthy and want supplement protection without the higher Plan G premium.
Plan benefits are federally standardized — the plan letter is the same regardless of carrier.What varies between carriers: premium, rate increase history, and service. That’s where independent advice makes a difference.
Why Choose Medicare Supplement Plans?
Many people prefer supplement plans because they offer:
Predictable Costs
Freedom of Provider Choice
Stability Year After Year
No Prior Authorization
They’re often a good fit for individuals who:
How Medigap Differs From Medicare Advantage
Medicare Supplement
Both can be good options — depending on your situation.
See the full side-by-side comparisonWhen Should You Enroll in Medigap?
The best time to enroll in a medicare supplement plan is during your:
Medigap Open Enrollment Period
This begins when:
During this 6-month window:
After this window, approval may require medical underwriting. Missing this enrollment period is one of the most common Medicare mistakes.
Timing matters.
How Much Do Supplement Plans Cost?
Medicare supplement plan premiums vary by several factors:
Premiums are higher than most Advantage plans, but out-of-pocket exposure is typically much lower and more predictable. The right comparison looks at total annual cost — not just the monthly premium.
How We Help You Choose the Right Plan
During your free medicare review, we walk through every option in your area together.
Cindy walks you through it — one plan at a time.
I’m Cindy Kowalski, a licensed independent Medicare advisor. I don’t work for any insurance company — I work for you. Together we’ll compare every supplement plan available in your area and find the one that actually fits your life.
Compare all available carriers in your ZIP code
Explain plan letter differences (G, F, N, and others)
Evaluate pricing structures (attained-age vs. community-rated)
Review each carrier’s rate increase history
Coordinate Part D drug coverage to work with your plan
Help with enrollment paperwork from start to finish
If a supplement plan makes sense for you, you’ll understand why.
If another option fits better, we’ll tell you that too.
Frequently Asked Questions
Can I switch from Medicare Advantage to a supplement plan?
Possibly, but medical underwriting may apply depending on timing. During certain enrollment periods or qualifying events, you may be able to switch without health questions. Every situation is different. Learn more about switching plans.
Do all Medigap plans cover prescriptions?
No. Prescription coverage requires a separate Part D plan. Medigap covers gaps in medical coverage only — not drugs.
Are benefits different between carriers?
Benefits are standardized by plan letter — Plan G from one carrier covers the exact same services as Plan G from another. However, pricing, customer service, and rate stability can vary significantly between carriers. That’s why comparing all options in your area matters.
Can I use my supplement plan out of state?
Yes. You can use it anywhere in the U.S. that accepts Medicare. There are no network restrictions or service area limitations.
What happens if I miss my Medigap Open Enrollment Period?
After your 6-month window ends, carriers can require medical underwriting and may deny coverage based on health conditions. This is why timing your enrollment correctly is so important. Learn about all Medicare penalties that can follow you for life.
Is a supplement plan better than Medicare Advantage?
It depends on your situation — doctors, prescriptions, budget, and how much flexibility you want. See the full side-by-side comparison or take the quiz to find out which fits you better.
Related Medicare Resources
Go deeper on the specific topics that inform your medicare supplement plans decision.
Plan Choices Overview
Understand Advantage, Supplement, and Part D before you decide.
Supplement vs Advantage
Side-by-side comparison of costs, coverage, and trade-offs.
Part D Coverage
Prescription drug plans you’ll need alongside your supplement.
Turning 65
First-time enrollment guidance and your personalized timeline.
Annual Review
Yearly plan checkup to keep your costs low and coverage right.
Enrollment Deadlines
Every enrollment period with exact dates and rules.
Common Mistakes
Costly errors in plan selection that can follow you for decades.
Switching Plans
How to change plans correctly — and what to know first.
Medicare Glossary
Every Medicare term explained in plain language.
Want predictable Medicare coverage?
Let’s review your options and make sure your coverage fits your long-term goals.
Licensed independent Medicare advisor. Reviews provided at no cost to you.