Medigap FAQ: Everything You Need to Know About Medicare Supplement Insurance

If you're approaching 65 or already on Medicare, you've probably heard about Medigap—but understanding what it actually does can feel overwhelming. After helping thousands of people choose the right Medicare supplement plan, I've compiled the most common questions into this comprehensive guide. Let's break it down in plain English.

What Is Medigap and Why Do I Need It?

Medigap is private insurance that helps pay the "gaps" in Original Medicare (Parts A and B)—things like copayments, coinsurance, and deductibles that Medicare doesn't fully cover.

Here's why this matters: Original Medicare typically covers about 80% of your healthcare costs. Without additional coverage, you're responsible for that remaining 20%, which can add up fast. A single hospital stay could cost you thousands out of pocket.

Real-world example: My client Martha had hip replacement surgery last year. Her Medicare Part A covered the hospital stay, but without Medigap, she would've owed a $1,632 deductible plus daily coinsurance fees. Her Medigap Plan G covered all of it except the Part B deductible.

Key Things Medigap Covers

• Part A coinsurance and hospital costs (up to an additional 365 days after Medicare benefits are exhausted)
• Part B coinsurance or copayment
• Blood transfusions (first 3 pints)
• Part A hospice care coinsurance
• Skilled nursing facility care coinsurance
• Part A and Part B deductibles (depending on your plan)
• Foreign travel emergency care (up to plan limits)

What Medigap doesn't cover: Prescription drugs, vision, dental, hearing aids, or long-term care. You'll need a separate Part D plan for prescriptions.

How Is Medigap Different from Medicare Advantage?

This is the #1 question I get, and it's crucial to understand because you can't have both—it's an either/or decision.

Medicare Advantage (Part C)

• Replaces Original Medicare entirely
• Usually includes prescription drug coverage
• Often has low or $0 monthly premiums
• Uses provider networks (HMOs, PPOs)
• Requires referrals for specialists (in most HMO plans)
• Has annual out-of-pocket maximums

Medigap (Medicare Supplement)

• Works alongside Original Medicare
• Requires a separate Part D plan for drugs
• Has monthly premiums (typically $100-$300+)
• No networks—see any doctor who accepts Medicare
• No referrals needed
• Predictable costs with minimal out-of-pocket expenses

Which is better? It depends on your situation. If you want maximum flexibility and travel frequently, Medigap often makes sense. If you prefer lower monthly costs and don't mind network restrictions, Medicare Advantage might fit better. I always tell people: there's no universally "best" choice, only the best choice for your specific needs and budget.

What Are the Different Medigap Plans?

Medigap plans are standardized and labeled with letters: A, B, C, D, F, G, K, L, M, and N. Every Plan G, for example, offers identical coverage regardless of which insurance company sells it. The only differences are price and customer service.

The Most Popular Plans in 2026

Plan G (The Gold Standard)

• Covers everything except the Part B deductible ($283 in 2026)
• Most comprehensive coverage available to new Medicare beneficiaries
• Typical monthly premium: $150-$250 depending on location and age
• Best for: People who want comprehensive coverage and predictable costs

Plan N (The Budget-Friendly Option)

• Covers most costs but has small copays ($20 for office visits, $50 for ER visits)
• You pay Part B deductible and Part B excess charges
• Typical monthly premium: $100-$180
• Best for: Relatively healthy people who want to save on premiums

Plan F (Being Phased Out)

• Covers 100% of gaps, including Part B deductible
• Only available if you were eligible for Medicare before January 1, 2020
• Typical monthly premium: $180-$300
• Many Plan F holders are switching to Plan G to save money

High Deductible Plan G

• Same coverage as regular Plan G, but you pay $2,800 deductible first (2025)
• Much lower monthly premiums (often $40-$80)
• Best for: Healthy people who rarely use healthcare services

Plans K and L (Cost-Sharing Plans)

• Cover 50% (Plan K) or 75% (Plan L) of most costs
• Lower premiums but higher out-of-pocket costs
• Less common—usually only make sense in specific financial situations

Plans no longer sold to new buyers: Plans C and F are not available if you became eligible for Medicare on or after January 1, 2020. If you already have one of these plans, you can keep it.

When Can I Buy a Medigap Plan?

The best time is during your Medigap Open Enrollment Period, which lasts 6 months and starts the month you turn 65 AND are enrolled in Medicare Part B.

Why This Window Matters

During this period, insurance companies cannot:

• Deny you coverage
• Charge you more due to health conditions
• Make you wait for coverage to start

Critical mistake I see constantly: People delay enrolling in Part B to avoid the premium, not realizing this closes their guaranteed-issue window for Medigap. Once that 6-month window closes, insurers can use medical underwriting—meaning they can deny you or charge significantly more if you have health issues.

Other Times You Have Guaranteed-Issue Rights

• Your Medicare Advantage plan leaves your area or stops offering coverage
• You move out of your plan's service area
• Your Medigap company goes bankrupt
• You dropped a Medigap plan to try Medicare Advantage for the first time within the past year

State exceptions: Some states (like California, Oregon, and New York) have additional protections. California, for example, has a birthday rule that gives you 60 days after your birthday each year to switch Medigap plans with minimal underwriting.

How Much Does Medigap Cost?

Monthly premiums vary widely based on several factors, but here's what to expect:

Average Monthly Premiums in 2026

• Plan G: $150-$250
• Plan N: $100-$180
• High Deductible Plan G: $40-$80
• Plan F (if eligible): $180-$300

What Affects Your Premium

1. Your location: Premiums in New York City or San Francisco can be double what they are in rural Kansas.

2. Your age: How this works depends on the pricing method:

• Community-rated: Everyone pays the same regardless of age (Massachusetts, Washington, Minnesota)
• Issue-age-rated: Premium based on your age when you buy (doesn't increase as you age)
• Attained-age-rated: Premium increases as you get older (most common)

3. Tobacco use: Smokers typically pay 15-30% more.

4. Gender: In most states, women pay slightly more than men (though some states prohibit this).

5. Household discounts: Some insurers offer 5-12% discounts if both spouses have policies.

The Reality About Pricing

I've seen identical Plan G coverage range from $127 to $310 per month in the same ZIP code. This is why shopping around is essential. The coverage is identical—why pay nearly $2,200 more per year for the same thing?

Pro tip: Don't just look at the premium today. Ask about the company's rate increase history. A plan that's $20 cheaper now but raises rates 15% annually will cost you more long-term than a stable plan with a higher starting premium.

Can I Switch Medigap Plans Later?

Short answer: Yes, but it's not guaranteed to be easy or affordable.

Long answer: Outside your initial 6-month enrollment period and special guaranteed-issue situations, switching plans requires medical underwriting in most states. This means:

• The insurance company will ask detailed health questions
• They can deny you based on pre-existing conditions
• They can charge you more based on your health status
• Some conditions (like diabetes, heart disease, or cancer history) can make you uninsurable

When Switching Makes Sense

Scenario 1: You're healthy and your current plan keeps raising rates significantly. Shopping for a new plan with medical underwriting might save you money.

Scenario 2: You're moving to a state with better consumer protections (like California or Oregon).

Scenario 3: Your needs have changed (you want more or less coverage).

My Honest Advice

I helped a client named Robert try to switch from Plan F to Plan G to save money. He'd had prostate cancer three years prior and thought he was in the clear. Five insurance companies rejected him. He's now stuck paying $300/month for Plan F when he could've been paying $180 for Plan G if he'd switched earlier.

The lesson: If you're considering switching and you're in good health, don't wait. Health changes can happen quickly, and once they do, your options narrow significantly.

Do I Need Medigap If I Have Retiree Insurance?

Maybe, maybe not. This depends entirely on how comprehensive your retiree coverage is.

Questions to Ask Your HR Department

• Does my retiree plan cover Medicare deductibles and coinsurance?
• Will it coordinate with Medicare (meaning Medicare pays first)?
• Is this coverage guaranteed for life, or can the company cancel it?
• What happens if the company goes bankrupt or restructures?
• What are my out-of-pocket maximums?

Important reality check: Many companies are reducing or eliminating retiree health benefits. I've worked with several people whose "lifetime" retiree coverage was discontinued when their former employer restructured.

If your retiree plan is solid and guaranteed, you may not need Medigap. But if there's any uncertainty, enrolling in Medigap during your initial enrollment period gives you guaranteed coverage that can't be taken away.

What Happens If I Miss My Enrollment Window?

You can still apply for Medigap, but insurance companies can:

Use Medical Underwriting

This means asking questions about:

• Current medications
• Recent hospitalizations
• Chronic conditions
• Past surgeries
• Mental health history

Reject Your Application

They can deny you if you have conditions like:

• Recent cancer diagnosis or treatment
• Congestive heart failure
• Chronic kidney disease
• Stroke history
• Insulin-dependent diabetes
• COPD requiring oxygen

Charge Higher Premiums

They can charge you more based on your health risk, and they can impose waiting periods for pre-existing conditions (up to 6 months in some cases).

Your Options If You're Denied

1. Try multiple insurance companies: Each has different underwriting guidelines. One company's "no" might be another's "yes."
2. Consider Medicare Advantage: These plans can't deny you for health reasons during Annual Enrollment (October 15 - December 7).
3. Wait for a guaranteed-issue opportunity: Like your Medicare Advantage plan leaving your area.
4. Move to a more protective state: Some states have annual open enrollment periods for Medigap (though this is obviously a drastic step).

How Do I Choose the Best Medigap Plan?

Here's my step-by-step process I've used with thousands of clients:

Step 1: Determine Your Priorities

Choose Plan G or F if:

• You want maximum coverage and predictable costs
• You have chronic conditions requiring frequent care
• You travel frequently (foreign travel emergency coverage)
• You prefer not to worry about copays and deductibles

Choose Plan N if:

• You're relatively healthy and don't visit doctors frequently
• You're comfortable with small copays ($20 office, $50 ER)
• You want to save $50-70/month in premiums
• You typically see doctors who accept Medicare assignment (most do)

Choose High Deductible Plan G if:

• You're very healthy and rarely use healthcare
• You can afford the $2,800 deductible if needed
• You want the lowest possible monthly premium
• You're good at budgeting for unexpected expenses

Step 2: Compare Prices from Multiple Insurers

Get quotes from at least 3-5 companies. Remember: Plan G is Plan G regardless of who sells it. The coverage is identical, so you're purely comparing price and customer service.

Where to compare:

• Your State Health Insurance Assistance Program (SHIP)—free, unbiased counseling
• Medicare.gov's plan finder tool
• Licensed insurance agents (should represent multiple companies)
• Directly from insurance company websites

Step 3: Check the Company's Financial Strength

Look up ratings from:

• AM Best (insurance financial strength)
• J.D. Power (customer satisfaction)
• Your state insurance department (complaint ratios)

A company with poor financial health might raise rates aggressively or even go out of business, forcing you to find new coverage.

Step 4: Review Rate Increase History

Ask each company: "What were your rate increases for this plan over the past 5 years?"

A company with 3-5% annual increases is reasonable. One with 12-15% increases will cost you significantly more over time, even if they're cheaper today.

Step 5: Consider Household Discounts

If your spouse also needs Medigap, household discounts (typically 5-12%) can add up to hundreds of dollars annually.

Real Stories: How Medigap Saved My Clients Money

Case Study 1: Emergency Surgery

John, 67, had emergency gallbladder surgery requiring a 4-day hospital stay and follow-up appointments. Total Medicare-approved charges: $52,000.

• Without Medigap: John would've owed approximately $11,000 (Part A deductible plus 20% coinsurance)
• With Plan G: John paid only the $283 Part B deductible for the year

His annual Medigap premium was $2,100. That one incident saved him nearly $9,000 out-of-pocket.

Case Study 2: Ongoing Chronic Care

Susan, 71, has Type 2 diabetes requiring regular endocrinologist visits, quarterly labs, and annual screening tests.

• Annual medical services: approximately $8,500 in Medicare-approved charges
• Without Medigap: 20% coinsurance = $1,700 annually
• With Plan N: Approximately $400 annually (office visit copays plus Part B deductible)

Her Plan N premium: $1,560 annually. Net cost with insurance: $1,960. Without insurance: $1,700. But she has peace of mind knowing any unexpected complications are covered.

Bottom Line: Is Medigap Worth It?

For most people, yes, Medigap provides valuable financial protection and peace of mind.

You Should Strongly Consider Medigap If You

• Want predictable healthcare costs
• Travel frequently or split time between states
• Have a chronic condition requiring regular care
• Can comfortably afford the monthly premium
• Value freedom to see any Medicare-accepting doctor
• Don't want to deal with prior authorizations or referrals

Medicare Advantage Might Be Better If You

• Are on a tight budget and need a low monthly premium
• Don't mind network restrictions
• Want prescription drug coverage included
• Rarely travel outside your area
• Are comfortable with prior authorizations

My professional recommendation: If you can afford it, enroll in a Medigap plan during your initial enrollment period. You can always switch to Medicare Advantage later if needed, but going the other direction (Medicare Advantage to Medigap) requires medical underwriting and might not be possible if your health declines.

Getting Help: Your Next Steps

1. Contact your State Health Insurance Assistance Program (SHIP): Free, unbiased counseling from trained volunteers. Find yours at shiptacenter.org or call 877-839-2675.
2. Use Medicare.gov's plan comparison tool: Compare Medigap prices in your area and see participating insurance companies.
3. Talk to a licensed insurance agent: Choose one who represents multiple companies and can provide objective comparisons. Avoid agents who push one specific plan or company without explaining alternatives.
4. Review your decision annually: Just because you choose Plan G this year doesn't mean it's the best forever. During your birthday month or special enrollment periods, review your options.

Frequently Forgotten Questions

Can I have both Medigap and Medicare Advantage?

No. It's illegal for an insurance company to sell you Medigap if you're in a Medicare Advantage plan, and vice versa.

Will my Medigap cover my spouse?

No. Each person needs their own individual Medigap policy.

What if I move to a different state?

Your Medigap plan travels with you. However, premiums vary by location, so you might want to shop for a new plan in your new state (medical underwriting may apply).

Can my Medigap plan be canceled?

Not as long as you pay your premiums on time. Even if you develop serious health conditions, your insurance company cannot cancel your coverage.

Do I need to tell my doctor I have Medigap?

Yes. Provide your Medigap information to your healthcare providers so they can bill correctly. Medicare pays first, then your Medigap plan pays its share.

This guide is for educational purposes and shouldn't replace personalized advice from a licensed insurance professional. Medicare rules and plans change annually, so verify current details before making decisions.

Have questions not covered here? Drop them in the comments, and I'll update this guide with answers that help everyone.

Found this helpful? Bookmark it for your next Medicare decision or share it with someone navigating their options.

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