Medicare is a health insurance for people aged 65 or older and younger individuals with disabilities. While it covers essential treatments and prescription drugs, there's still a significant gap, and there are limits on specific services.

That's where Medicare Supplement and Medicare Advantage plans come in. This article is a complete guide to Medicare Supplement vs Medicare Advantage, with a head-to-head cost comparison and coverage details. Continue reading. 

How Does Original Medicare Work

Before we discuss Medicare Supplement vs Medicare Advantage in detail, let's first look at original Medicare working and coverage: 

• Part A: Medicare Part A is hospital insurance that covers complete inpatient hospital care, skilled nursing facility care, hospice care, and some health-related care. However, you must still meet their deductible before Medicare covers the maximum cost of treatment. For example, Medicare Part A covers the first 60 days of an inpatient stay, but for the remaining 61 to 90 days, you should pay a set coinsurance amount per day. 

• Part B: On the other hand, Medicare Part B is a health insurance plan that covers necessary medical services, like doctor visits, preventive services, and durable medical equipment. Some services that you can get include emergency ambulance transportation, chemotherapy, kidney dialysis, occupational therapy, and laboratory tests. Before Part B covers your medical conditions, you have to pay an annual deductible of $283 (2026).

Nonetheless, Original Medicare still has many gaps, including no annual out-of-pocket maximum, so healthcare expenses can accumulate over time. Along with hospital deductibles, you have to pay for 20% coinsurance. On top of this, there's no coverage for routine dental care, vision exam, and some prescription drugs. So let's discuss Medicare Supplement vs Medicare Advantage to know how you can fill these gaps. 

What Is Medicare Supplement (Medigap) Insurance?

The Medicare Supplement (Medigap) insurance is provided by private insurance companies that you can use along with the Original Medicare Part A and Part B. Statistics show that 23% of Medicare's 65.1 million beneficiaries are enrolled in a Medigap plan. Here's an overview of how it works and some standardized plan options: 

How Medigap Works? 

In Medicare Supplement vs Medicare Advantage, the former (Medigap) is a supplemental insurance policy that fills the gaps, especially out-of-pocket expenses like copayments, deductibles, and coinsurance that Original Medicare doesn't cover. For instance, it can cover doctor or hospital visits while you are traveling in another country. Know that to get Medigap advantages, you must enrol in Medicare Part A and B. 

Standardized Plan Options

Medigap has multiple standardized plans from letters A to D, F, G, K, and N, all offering similar benefits but with some pricing differences. Let's look at them: 

• Plans C and F: Plans C and F aren't available to individuals who enrolled in Medicare after January 1, 2020, since Medigap no longer covers the Part B deductible. Plan F is the most generous, as it covers everything, including Part A hospital deductibles, Part B deductibles, and copayments. By contrast, Part C is similar, except it doesn't cover the Part B deductibles. 

• Plan G: This plan is a popular choice for those who couldn't get Plan F. It can cover the excess charges that your doctor might charge if they don't accept a Medicare-approved amount as full payment. However, you still have to pay the Part B deductible. 

• Plan D: Plan D covers many drugs but doesn't pay for the excess charges.

• Plan M: Plan M is pretty much like Plan D, but Plan D only covers half of the Part A deductible. 

• Plan K and L: If you are looking for something cheaper, Plan K and Plan L stand out, as they have lower monthly costs and you'll only share the coinsurance (50% for K and 25% for L).

• Plan N: Plan N is also quite popular and has lower premiums than Plan G and Plan F. It covers 100% of the cost of Part B services, excluding copayments. 

• Plan A and Plan B: Plan A provides basic Medigap coverage, while Plan B also covers hospitalization. 

Provider Access and Network Rules

Keep your red, white, and blue Medicare card and use it at any doctor, specialist, or hospital that accepts Medicare patients. You don't need a referral to see a specialist and can get your issues treated right away. 

What Is Medicare Advantage (Part C)?

In Medicare Supplement vs Medicare Advantage, you are aware of the former; now, let's look at what the latter has to offer: 

How Does Medicare Advantage Work? 

The Medicare Advantage plan is also offered by private companies approved by Medicare. It's an all-in-one plan that includes hospital, medical, and prescription drug coverage in a single place. Participants have to pay the Part B deductible and the MA plan premium, which was $17.00 in 2025. 

Common Plan Structures (HMO, PPO, SNP)

Here's a glimpse into the various plan structures offered by Medicare Advantage in Medicare Supplement vs Medicare Advantage: 

• Health Maintenance Organization (HMO): Your coverage and benefits are limited to a defined network of healthcare providers and require referrals. 

• Preferred Providers Organization (PPO): The PPO also limits you to a specific network of providers, but members have the flexibility to see some outside the network. It has higher out-of-pocket expenses and doesn't require any referral. 

• Special Needs Plan (SNP): It's a special needs plan available to seniors and people with disabilities who have both Medicare and Medicaid. It also helps manage chronic conditions like cardiovascular diseases, diabetes, and congestive heart failure. 

Extra Benefits

Some extra benefits that the Medicare Advantage plan offers in Medicare Supplement vs Medicare Advantage include routine dental, vision, and hearing care. In addition, you get access to fitness programs and telehealth that reduce overall expenses. 

The CMS caps in-network out-of-pocket maximum spend at $9,350 in 2026. Many Advantage plans have a $0 premium, but you still have to pay the Part B premium, which is $192.10/month (2026). 

Medicare Supplement vs. Medicare Advantage: Side-by-Side Comparison

Real Cost Comparison: What You Actually Pay

If you are still unable to figure out the cost of Medicare Supplement vs Medicare Advantage, here's a scenario-based analysis: 

Scenario: A Hip Replacement

A hip replacement is a major procedure for Medicare beneficiaries and can easily total tens of thousands of dollars in bills.

Medicare Supplement Plan G

• Plan G premium: not fixed, varies from $100 to $250 per month and annually ($1200 to $3000)

• Part B deductible: $283 

• Coinsurance for Surgery: $0

• Follow-Up: $0

Total = $1483 to $3283

Medicare Advantage Plan 

• Plan Premium: $0 to $600 per year 

• Coinsurance for Surgery: $0

• Rehab or follow-up: $0

• Cap: $3500 

If the total annual cost goes above $3500, you have to pay the remaining amount yourself, so in case of a major life injury, the Medicare Supplement is predictable and safe. 

Scenario: A Healthy Year With Only Routine Care

However, if you are healthy and have only 4 primary care visits, 1 specialist visit, and preventive screenings, the cost analysis will be: 

Medicare Supplement 

• Plan G premium: not fixed, varies from $100 to $250 per month and annually ($1200 to $3000)

• Part B deductible: $283 

• Coinsurance: $0

Total: $1483 to $3283

Medicare Advantage 

• Plan Premium: $0 to $600

• Doctor Visit Copays: $0 to $50

• Preventive Services: $0

Total: $0 to $650 

In years when you only need routine care and are healthy, Medicare Advantage leads to lower costs. 

When Medicare Supplement May Be the Better Choice?

Deciding between Medicare Supplement and Medicare Advantage can be quite complicated. Medicare Supplement is the ideal choice if you: 

• Travel frequently or split your time between different states. 

• Have a preferred specialist or clinic for checkups. 

• Suffering from complicated and chronic health conditions. 

• Value budget predictability over premium savings in the long run. 

• Are aware of prior authorization delays that slow down your access to care

When Medicare Advantage May Be the Better Choice?

On the other hand, in Medicare Supplement vs Medicare Advantage, choose the latter if you: 

• Want lower monthly premiums. 

• Seek dental, vision, and hearing coverage bundled in. 

• Are in good health and require minimal specialist visits. 

• Live in a metro area with an incredible network of providers.

• Prefer the convenience of one card and one plan.

Prior Authorization: A Key Difference to Understand

Prior authorization, as the name implies, is a requirement that healthcare providers obtain from Medicare before providing services to patients. Often, this process takes 14 days, but it may take longer, which leads to frustration. 

Also, since it's not required under Original Medicare or Medigap, patients looking to get surgery or medication through Advantage may feel anxious. 

However, CMS has tightened its PA rules to urge faster decision-making, yet denials and delays still occur. Statistics show that Medicare Advantage plans denied 13% of prior authorization requests that met Medicare coverage rules. 

Switching Between Plans: What You Need to Know

After knowing Medicare Supplement vs Medicare Advantage details, if you plan to switch, here's how and when to do it: 

Switching from Medigap to Medicare Advantage

You can easily switch from Medigap to Medicare Advantage during the Annual Enrollment Period each fall, October 15 through December 7. However, you must cancel the other subscription; otherwise, you'll have to pay premiums for both. 

Switching from Medicare Advantage to Medigap

To make changes to your Medicare Advantage, the Annual Election Period (AEP) is the ideal time. You have to do the medical underwriting, where you'll answer questions about your past and current health status. Once you are successfully enrolled, discontinue your Advantage plan. 

Guaranteed Issue Rights: When You Have Protection

In case you are making changes to your Advantage plan other than the protected window, the insurers will charge you higher premiums, impose high fines, or deny your application altogether. The following are the situations where you are protected: 

• Advantage Plan is leaving your area. 

• Lose employer coverage that was secondary to Medicare. 

• Move outside your plan’s service area. 

How an Aviator Health Advocate Can Help

Let's say you are still confused. Aviator Health Advocate can make the whole situation better. Our experts provide you with an unbiased side-by-side comparison of Supplement and Advantage plans based on your specific doctor, drugs, and health history. 

As you decide the right plan for your needs, we negotiate every claim on your behalf. Not only that, but our advocates also process prior authorizations for Advantage plans and, in case of a denial, appeal the denial. We also provide switching guidance and make the move for you, so your plan changes with your needs. 

Conclusion 

In Medicare Supplement vs Medicare Advantage, the choice of the plan depends upon your own unique health needs. Visit Aviator Health today and get an advocate who can help you in choosing the right option and process your claims accordingly. 

Frequently Asked Questions

Can I have both Medicare Advantage and a Medigap plan?

No, you cannot have both Medicare Advantage and Medigap plans as the federal law prohibits selling Medigap to someone who already has an Advantage plan. 

Is Medicare Advantage really free?

Not exactly. Many Medicare Advantage plans advertise $0 monthly premiums, but you still have to pay the Part B deductible. 

What is the Medicare Advantage out-of-pocket maximum?

The Medicare Advantage out-of-pocket maximum in 2026 is $9250, but each plan has its own limit. 

Can I switch from Medicare Advantage back to Original Medicare?

Yes, you can switch from Medicare Advantage back to Original Medicare during the Annual Enrollment Period (October 15 – December 7) or the Medicare Advantage Open Enrollment Period (January 1 – March 31).

Do Medicare Supplement plans cover prescriptions?

No, Medicare Supplement plans don't cover prescription drugs. For that, you need a separate Part D plan. 

Which plan is better for someone with a chronic condition?

For someone with chronic conditions, a Medigap plan, especially plan G, can be the most suitable option. 

This article is for informational purposes only and is not a substitute for professional medical, legal, or financial advice. Always consult qualified professionals regarding your specific healthcare situation.