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Original Medicare or Medicare Advantage: what is the difference?

Original Medicare with a supplement lets you see any doctor for a set monthly cost. Advantage costs less each month but uses a network, and going back is not guaranteed.

Updated September 3, 2026 · 4 min read · by Gerino Alejos

Original Medicare lets you see any doctor that takes Medicare. You pair it with a supplement, a policy that pays the share of the bill Medicare leaves to you. You also buy a drug plan on its own. That path has a higher fixed monthly cost. Medicare Advantage moves you into a private plan, usually with little or no extra premium, the monthly bill for the coverage. You get added benefits and a yearly cap on what you pay. In return you use a network, the list of doctors the plan has contracts with, and follow plan rules.

Both paths work. The right one depends on your doctors, your health, and how you feel about surprise bills. Medicare describes both on medicare.gov.

Original Medicare with a supplement

You stay in the government program. Medicare pays 80 percent of most bills and leaves 20 percent to you. You add a Medicare Supplement policy, also called Medigap, to cover that 20 percent. You also add a standalone Part D plan for drugs. Standalone means a plan you buy on its own, and Part D is the part of Medicare that covers drugs.

Without a supplement, a $50,000 hospital bill would leave you with $10,000.

• Any doctor or hospital in the country that takes Medicare, and most do.
• No networks. No referrals, the note from your main doctor before you can see a specialist. No prior authorization, plan approval before a service, for most care.
• Very steady costs. With a full supplement, most people rarely see a medical bill.
• A higher fixed monthly premium: the supplement plus the drug plan.
• No dental, vision or hearing unless you buy them on your own.

This path suits people who travel or spend part of the year somewhere else. It also suits people who see specialists outside the area, or never want to ask whether a doctor is in network. See whether you can keep your doctor.

Medicare Advantage

A private plan runs your Medicare for you. You keep paying your Part B premium (Part B is the part of Medicare that pays for doctor visits), and the plan handles your care.

• Often no extra monthly premium beyond Part B.
• Usually includes drug coverage, and often dental, vision, hearing and a fitness benefit.
• A yearly out of pocket maximum, the most you can pay in a year for covered care. Original Medicare alone does not have one.
• A network, plus referrals and prior authorization on many services.
• Costs come as copays, set amounts you pay each time you use care. They can add up in a year with a lot of care.

This path suits people whose local doctors are already in the network and who want the extra benefits. It also suits people who would rather pay as they go than pay every month. See how Part C works.

What this looks like in Hidalgo County

Most people on Medicare here are on an Advantage plan, a share well above the Texas average. Many of the plans here have no extra premium. Networks in South Texas are deep, and the plans compete hard for members.

That is why the supplement path gets overlooked by people it would serve better.

Switching back later can require underwriting

Moving from an Advantage plan to a supplement later is not guaranteed. The reason is underwriting, which means the company can look at your health history and say no.

Your Medigap open enrollment runs six months from the day your Part B starts. During that window, no company in Texas can turn you down or charge you more because of your health. After it closes, they can ask health questions and say no.

You can always move between Advantage plans, and you can always go back to Original Medicare. What is not guaranteed is being able to buy the supplement.

The questions that decide it

1. Are your current doctors in the plan's network, and how likely are you to need a specialist outside it?
2. Do you spend a lot of time out of the area or out of state?
3. Do you have a condition that could make future underwriting risky?
4. Would you rather pay a known amount every month, or smaller amounts only when you use care?
5. How much are the dental and vision benefits worth to you in dollars?

There is a right answer for you, and it takes about an hour to work out. See how to decide.

For help deciding which path fits you, get your Medicare options. Enter your ZIP code and a licensed agent calls you back.

Before you choose, write down your doctors, your prescriptions, and the months you spend away from home. Check that list against both paths. If you want to go through that list with us, call the office or enter your ZIP code in the form on this page.

Gerino Alejos

Licensed insurance agent · License 3128710 · NPN 18243381

Owner of McAllen Insurance Group, an independent agency on North 10th Street in McAllen. Works with clients across Hidalgo, Cameron and Starr counties on Medicare, Marketplace health, life and auto coverage. Se habla español.