Medicare Supplement Plans (Medigap) 2026: Complete Guide to Coverage and Costs

Medicare Supplement Plans (Medigap) 2026: Your Complete Guide to Coverage and Costs

Turning 65 and enrolling in Medicare is a major life milestone, but Original Medicare (Parts A and B) leaves significant gaps in coverage that can result in thousands of dollars in out-of-pocket costs. Medicare Supplement Insurance—commonly called Medigap—fills these gaps by covering copayments, coinsurance, and deductibles that Original Medicare does not pay.

With over 14 million Americans enrolled in Medigap plans and monthly premiums ranging from $80 to $400+ depending on your age, location, and chosen plan, understanding your options is critical to avoiding costly mistakes and ensuring comprehensive healthcare coverage in retirement.

This 2026 guide explains exactly how Medigap works, which plans offer the best value, when to enroll, how pricing works, and the critical decisions you must make during your Initial Enrollment Period to avoid permanent penalties and coverage denials.

What Is Medicare Supplement Insurance (Medigap)?

Medigap is private insurance sold by private companies that helps pay healthcare costs not covered by Original Medicare (Parts A and B), such as copayments, coinsurance, and deductibles.

What Medigap covers:

• Part A hospital insurance deductibles and coinsurance
• Part B medical insurance deductibles and coinsurance
• First three pints of blood each year
• Part A hospice care coinsurance
• Skilled nursing facility care coinsurance
• Some foreign travel emergency care (80% after $250 deductible, up to $50,000 lifetime)

What Medigap does NOT cover:

• Prescription drugs (you need Part D for this)
• Vision care
• Dental care
• Hearing aids
• Long-term care (nursing home)
• Private-duty nursing

Medigap vs. Medicare Advantage: Which Is Better?

This is the most important decision you will make about Medicare coverage. You cannot have both Medigap and Medicare Advantage—you must choose one.

Medigap (Medicare Supplement)

How it works: Original Medicare + Medigap plan + separate Part D plan

Pros:

• Freedom to see any doctor or specialist that accepts Medicare nationwide (no networks)
• Predictable out-of-pocket costs (premiums cover most expenses)
• No referrals needed for specialists
• Guaranteed renewable (cannot be canceled as long as you pay premiums)
• Works anywhere in the US

Cons:

• Higher monthly premiums ($100-$400/month)
• Requires separate Part D prescription drug plan
• No dental, vision, or hearing coverage (must buy separately)

Medicare Advantage (Part C)

How it works: Private insurance replaces Original Medicare

Pros:

• Lower monthly premiums ($0-$100/month in many areas)
• Often includes prescription drug coverage
• May include dental, vision, hearing, fitness benefits
• Out-of-pocket maximum limits total annual spending

Cons:

• Restricted provider networks (HMO/PPO limitations)
• Requires referrals for specialists (HMO plans)
• Higher out-of-pocket costs when you need care
• Coverage limited to service area
• Plans can change benefits and networks annually

Who should choose Medigap: Frequent travelers, people who see specialists regularly, those who want predictable costs and maximum flexibility

Who should choose Medicare Advantage: Healthy individuals on tight budgets, people comfortable with HMO restrictions, those who rarely travel outside their area

The 10 Standardized Medigap Plans Explained

Medigap plans are standardized by the federal government and labeled with letters: A, B, C, D, F, G, K, L, M, and N. Every Plan G from every company offers identical coverage—only the price differs.

Most Popular Plans in 2026

Plan G – Most Comprehensive and Best Value

Monthly premium: $120-$250 (varies by age, location, company)

What it covers: Everything except the Part B deductible ($240 in 2026)

Best for: Most Medicare beneficiaries seeking comprehensive coverage with predictable costs

Why it’s popular: Offers nearly complete coverage for a reasonable premium. After paying the $240 annual Part B deductible, you have virtually no out-of-pocket costs.

Plan N – Lower Premium Alternative

Monthly premium: $90-$180 (about 15-20% less than Plan G)

What it covers: Everything except Part B deductible, copays up to $20 for office visits, copays up to $50 for emergency room visits (waived if admitted)

Best for: Relatively healthy people who rarely visit doctors, budget-conscious enrollees

Trade-off: Lower premiums but $20 doctor visit copays and $50 ER copays add up if you need frequent care

High Deductible Plan G

Monthly premium: $40-$80

What it covers: Everything Plan G covers, but only after you meet a $2,800 deductible (2026)

Best for: Very healthy individuals willing to self-insure for routine care

Math to consider: Premium savings of $80-150/month = $960-$1,800/year. If you stay healthy, you save money. If you need significant care and hit the deductible, you still have protection.

Plan F – Being Phased Out

Important: Plan F is no longer available to people who became eligible for Medicare after January 1, 2020. Only those grandfathered in can keep it.

What it covers: 100% of all Medicare gaps, including Part B deductible

Why it’s disappearing: Congress eliminated it to reduce overutilization of healthcare services

Less Common Plans

• Plan A: Basic coverage only. Rarely recommended due to limited benefits for only slightly lower premiums than better plans.
• Plan B: Covers Part A deductible but little else. Poor value.
• Plan C: No longer available to new enrollees (grandfathered only).
• Plan D: Moderate coverage, less comprehensive than Plan G. Uncommon.
• Plans K & L: Cost-sharing plans with out-of-pocket limits. Complex and rarely chosen.
• Plan M: Pays 50% of Part A deductible. Niche option.

How Much Do Medigap Plans Cost?

Medigap premiums vary dramatically based on:

• Your age (older = higher premiums)
• Your ZIP code (costs vary up to 300% between states)
• Your gender (in some states)
• Tobacco use (+50% surcharge in many states)
• Insurance company (same plan, different prices)
• Pricing method (community-rated, issue-age, or attained-age)

Average Plan G Monthly Premiums by Age (2026)

• Age 65: $120-$180
• Age 70: $140-$220
• Age 75: $160-$260
• Age 80: $190-$320

Three Medigap Pricing Methods

1. Attained-Age Pricing (most common)

Premiums increase as you age. Cheapest initially but becomes expensive over time.

2. Issue-Age Pricing

Premium based on age when you first enroll. Increases only with inflation, not age. Good long-term value.

3. Community-Rated (No-Age)

Same premium for everyone regardless of age. More expensive initially but stays relatively stable. Rare.

Pro tip: Issue-age pricing often provides the best long-term value, especially if you enroll at 65.

When Can You Enroll in Medigap?

Medigap Open Enrollment Period (Guaranteed Issue)

Your Medigap Open Enrollment Period is a one-time, six-month window that begins the month you turn 65 AND are enrolled in Medicare Part B.

Why this matters: During this six-month period, insurance companies:

• CANNOT deny you coverage
• CANNOT charge you more due to pre-existing conditions
• CANNOT make you wait for coverage to begin
• MUST sell you any Medigap plan they offer

Critical: If you miss this window, you may never qualify for Medigap coverage if you have health issues. Insurance companies can deny you based on medical underwriting.

Special Guaranteed Issue Rights

You can buy Medigap without medical underwriting in certain situations:

• Your Medicare Advantage plan is leaving Medicare or stops serving your area
• You move out of your Medicare Advantage plan service area
• Your employer or union group health coverage ends
• You lose Medicaid eligibility

How to Choose the Best Medigap Plan

Step 1: Decide Between Plan G and Plan N

For most people, the choice comes down to these two plans.

Choose Plan G if you:

• Visit doctors frequently
• Have ongoing health conditions requiring regular care
• Want complete predictability in costs
• Can afford $120-$250/month premiums

Choose Plan N if you:

• Are relatively healthy and rarely see doctors
• Want to save 15-20% on premiums
• Are comfortable with small copays ($20 doctor visits, $50 ER visits)
• Have a tight monthly budget

Do the math: If Plan G costs $180/month and Plan N costs $140/month, the $40 monthly savings ($480/year) means you can afford 24 doctor visits at $20 each before Plan G becomes cheaper. Most people do not visit doctors that frequently.

Step 2: Compare Prices from Multiple Companies

Every Plan G offers identical coverage, but premiums vary by 50% or more between companies.

Example Plan G quotes (65-year-old in Texas):

• Company A: $145/month
• Company B: $168/month
• Company C: $189/month
• Company D: $220/month

Annual cost difference: Choosing Company A over Company D saves $900 per year for identical coverage.

Top-rated Medigap insurance companies in 2026:

• AARP/UnitedHealthcare (largest Medigap provider)
• Mutual of Omaha
• Blue Cross Blue Shield (varies by state)
• Aetna
• Humana
• Cigna

Step 3: Check Company Financial Strength

Since you will likely keep your Medigap plan for decades, choose financially stable insurers rated A or better by AM Best.

Step 4: Consider Household Discounts

Many companies offer discounts if both spouses enroll, potentially saving 5-12% on premiums.

Common Medigap Mistakes to Avoid

1. Missing Your Open Enrollment Period

This is the costliest mistake. If you delay enrolling past your six-month window and later develop health issues, you may be denied coverage or charged significantly higher rates.

2. Enrolling in Medicare Part A at 65 But Delaying Part B

Your Medigap Open Enrollment starts when you enroll in BOTH Part A and Part B. Delaying Part B delays your guaranteed-issue rights.

3. Assuming All Plan Gs Are the Same Price

Coverage is identical, but premiums vary dramatically. Always shop and compare at least five companies.

4. Choosing Based Only on Current Premium

Understand the pricing method (attained-age vs. issue-age vs. community-rated). The cheapest plan today may become expensive in five years if it uses attained-age pricing.

5. Buying Directly from an Agent Who Represents One Company

Captive agents can only sell their company’s plans. Work with independent brokers who can compare multiple carriers.

6. Forgetting About Part D

Medigap does not include prescription drug coverage. You must enroll in a standalone Part D plan during your Initial Enrollment Period or face permanent late enrollment penalties.

Final Thoughts

Medigap provides peace of mind, financial protection, and healthcare flexibility that Medicare Advantage plans cannot match. While monthly premiums are higher, the freedom to see any doctor nationwide without referrals or network restrictions—plus predictable out-of-pocket costs—makes Medigap the preferred choice for millions of retirees.

The key decisions are:

1. Enroll during your six-month Open Enrollment Period—do not miss this window
2. Choose between Plan G (comprehensive) and Plan N (lower premium, small copays)
3. Compare prices from at least five companies for identical coverage
4. Understand the pricing method to avoid future premium shock
5. Enroll in Part D to avoid prescription drug coverage gaps and penalties

Take the time to research, compare options, and enroll strategically. The decisions you make now will impact your healthcare and finances for the rest of your retirement.