How to Compare Medicare Plans: Advantage vs. Supplement (2026)

How to Compare Medicare Plans: Advantage vs. Supplement is the question most people face as they approach age 65. But before you can make that choice, you need your Medicare parts explained. Once you have that foundation, the smart way to compare Medicare options in 2026 is to look beyond the premium and check three things: your doctors, your prescription drugs, and your worst case costs in a year where you need more care.

This guide shows you how to compare Medicare Advantage vs Medicare Supplement (Medigap) step by step so you can choose coverage that fits your budget and keeps surprises to a minimum.

Step 1: Start with your doctors and specialists

Before you compare prices, make sure the plan actually works with your health care.

Ask these two questions first:

• Do my doctors accept this coverage?

• If I need a specialist or hospital later, will I still have strong access?

With Medicare Advantage, provider access is usually based on a network (HMO or PPO). Some plans may require referrals, and out-of-network coverage can be limited or more expensive.

With Original Medicare, you can generally see any provider nationwide who accepts Medicare, which can be helpful if you travel often or want broader flexibility.

A “great” plan on paper is not great if you cannot comfortably use it.

Step 2: List your prescriptions and the pharmacy you prefer

Prescription coverage is where people get surprised.

A plan might look inexpensive, then one medication changes everything. Two plans can have the same premium, but very different costs depending on:

• Whether your drug is on the plan’s formulary (covered drug list)

• What “tier” the drug is on

• Whether there are restrictions like prior authorization

• Which pharmacy you use

Even common medications can vary in cost by plan and pharmacy, so you want to compare using your real list, not a guess.

Step 3: Use Medicare’s Plan Finder to compare apples to apples

A smart starting point is the official Medicare Plan Finder, because it lets you compare plans in your ZIP code while factoring in your medications and pharmacy. (Medicare.gov)

When you run a comparison, focus on the plan’s total estimated annual cost, not just the monthly premium.

Step 4: Compare the three cost buckets that drive your real yearly spend

Most people look at premiums first, but your real cost comes from three buckets:

1. Monthly premiums
   This includes Part B, plus any plan premium (Medigap, Medicare Advantage, and Part D, depending on what you choose).

2. Cost sharing when you use care
   Think deductibles, copays, and coinsurance. With Original Medicare, Part B generally has coinsurance, and without supplemental coverage there is no built-in annual out-of-pocket limit.

3. Your worst case exposure
   This is what you could pay in a high-cost medical year. Medicare Advantage plans include an annual out-of-pocket maximum for covered Part A and Part B services, while Original Medicare by itself does not. The point is not to assume the worst will happen. The point is to know what you are agreeing to.

Real world example: A Medicare Advantage plan can have a $0 premium, but a high out-of-pocket maximum and expensive drug costs. Another option might have higher monthly premiums but much lower risk if you have a hospital stay, ongoing treatments, or costly prescriptions.

Original Medicare: what you are really buying

Original Medicare is made up of:

• Part A (hospital)

• Part B (outpatient and medical)

Most people then add:

• A Part D drug plan

• A Medigap (Medicare Supplement) plan to help cover cost sharing

For 2026, the standard Part B premium is $202.90 per month and the Part B deductible is $283, though your amount can be higher based on income. (CMS.gov)

The key question with Original Medicare is whether you want to add a Medigap plan to reduce your out-of-pocket risk and make costs more predictable.

Medigap Plan G vs High Deductible Plan G: the tradeoff in plain English

Medigap plans are standardized (by letter) in most states. That means Plan G from one company provides the same medical benefits as Plan G from another company, but premiums can differ.

Two common approaches people compare are:

• Medigap Plan G: Higher monthly premium, lower cost exposure when you use care (you generally pay the Part B deductible, then the plan helps with most remaining approved costs).

• High Deductible Plan G: Lower monthly premium, but you pay more out of pocket before the plan pays benefits.

This is really a “certainty vs flexibility” decision:

• If you want steadier costs and less risk, standard Plan G often feels simpler.

• If you are comfortable taking on more risk in exchange for lower premiums, a high deductible option can make sense for some people.

Why timing matters with Medigap

When you first enroll in Part B at 65 or older, you get a one-time 6-month Medigap Open Enrollment Period in which you can generally buy a Medigap policy sold in your state without medical underwriting. After that window, switching plans or getting a new Medigap policy can be harder in many states. (Medicare.gov)

That is why many people try to make a thoughtful decision up front, not just pick the cheapest premium and hope it works out later.

Medicare Advantage: what to look at beyond the premium

Medicare Advantage (Part C) plans bundle your Part A and Part B coverage through a private insurer, and many include drug coverage (Part D).

They can be a good fit for some people, but to compare them fairly, look beyond “$0 premium” and check:

• Provider network: Are your doctors and preferred hospitals in-network?

• Plan type: HMO vs PPO and whether referrals are required

• Out-of-pocket maximum: Your annual cap for covered Part A and Part B services

• Drug costs: Formularies can differ a lot, even between similar plans

• Rules and restrictions: Prior authorization, step therapy, and coverage rules can impact how easy care is to access

Also remember: a plan can look affordable when you are healthy, but feel very different if you need frequent specialists, imaging, outpatient procedures, or brand-name medications.

Medicare comparison table

A step-by-step decision process you can actually use

If you want a clean way to choose, follow this order:

1. Confirm your enrollment timing (avoid late penalties and gaps)

2. List doctors, specialists, and preferred hospitals

3. List medications and pharmacies

4. Run plan comparisons using your real inputs

5. Compare total annual cost in two scenarios:

   • A lower-use year (routine care)

   • A higher-use year (unexpected surgery, imaging, new specialists)

6. Decide what matters most: flexibility, lowest premium, lowest risk, or a balance

This keeps you from getting trapped in “premium shopping” and helps you choose based on your real life.

How to get personalized help if you are enrolling for the first time

If you want support comparing options based on your doctors, medications, budget, and long-term flexibility, The Medicare Coach can help anyone looking to enroll into Medicare for the first time with our Medicare Enrollment Concierge services.

Conclusion: compare the plan you will live with, not the plan that looks good in an ad

When you compare Medicare plans the right way, you stop guessing and start making a confident decision based on total costs, provider access, and your future flexibility, so before you choose, have you looked at your doctors, your prescriptions, and your worst case costs side by side?