Original Medicare vs. Medicare Advantage: How to Choose in Texas

Original Medicare is the federal program made up of Part A hospital insurance and Part B medical insurance. Medicare Advantage, also called Part C, is a private-plan alternative for receiving those same core benefits.

Both options require attention to premiums, out-of-pocket spending, and prescription coverage. They are not two plans you stack together: a person enrolled in Medicare Advantage receives Medicare-covered Part A and Part B services through that plan, subject to its rules.

If you are new to the program, start with our introduction to Medicare before comparing coverage arrangements.

Understanding the two ways to receive Medicare

Texas residents can choose between these approaches based on where they live and what is available. Original Medicare works nationally with providers who accept Medicare.

Medicare Advantage plans are sold by county or service area, and availability varies. A plan advertised in Houston might not be available in a rural Texas ZIP code.

Your address, medical needs, and preferred providers should guide the comparison, not television advertisements or a neighbor's experience.

How doctor and hospital access differs

Original Medicare generally allows you to see any doctor or hospital nationwide that accepts Medicare. You usually do not need a referral from a primary care physician to see a specialist.

Some providers do not participate in Medicare, so you should still confirm acceptance. Medicare Advantage plans often use HMO or PPO networks.

An HMO generally requires you to use network providers for nonemergency care, while a PPO may cover out-of-network care at higher cost. Each plan's evidence of coverage explains its rules.

Network details are especially important for Texans who travel, spend time in another state, or use specialists at a regional medical center. Ask whether every physician involved in your treatment is in-network, not just the hospital.

Also check whether a planned procedure requires prior authorization. Emergency and urgently needed services have specific protections under Medicare Advantage, but those protections are not the same as unrestricted routine care outside the service area.

Comparing monthly premiums and total costs

Many people have premium-free Part A, but most pay a Part B premium regardless of whether they choose Original Medicare or Medicare Advantage.

Original Medicare has deductibles and coinsurance; for many Part B services, you pay 20% of the Medicare-approved amount after the deductible.

There is no annual out-of-pocket cap on Original Medicare Part A and B spending by itself. A Medigap policy can help pay certain gaps, but it has a separate monthly premium.

Learn more in our Medicare cost guide.

Medicare Advantage plans set their own copayments, coinsurance, and annual out-of-pocket limits for covered Part A and B services within federal rules.

Some advertise a $0 additional plan premium, but that does not eliminate the Part B premium or the cost of using care.

Compare the plan's maximum out-of-pocket amount, inpatient hospital charges, specialist visits, and expensive outpatient services. A lower monthly premium can come with higher financial exposure in a year when you need substantial care.

Prescription drug coverage

Original Medicare does not automatically include broad outpatient prescription coverage. People who stay with Original Medicare commonly add a standalone Part D plan.

Many Medicare Advantage plans bundle Part D drug coverage, although not every plan does. In either arrangement, verify your exact drugs, dosages, preferred pharmacies, and utilization restrictions before enrolling.

A drug that is covered today might be subject to a different tier, deductible, or prior authorization rule next year.

Part D has its own enrollment deadlines and potential late-enrollment penalty when someone goes without creditable prescription coverage for too long.

If you have employer or retiree drug benefits, ask whether they are creditable before making a change.

Our Part D guide explains formularies and pharmacy costs. For plan-specific comparisons, use the official Medicare Plan Finder.

Where Medigap fits into the decision

Medigap is supplemental private insurance designed to work with Original Medicare. It is not a Medicare Advantage plan.

Depending on the standardized Medigap plan, it can cover some or most Medicare cost-sharing, but it generally does not include standalone prescription drug coverage. A common arrangement is Original Medicare plus Medigap plus Part D.

That creates multiple premiums, but it can also make Medicare-covered medical expenses more predictable.

The timing of a Medigap purchase matters. Federal Medigap open enrollment generally lasts six months beginning when you are at least 65 and enrolled in Part B.

During that period, you have significant protection against medical underwriting. If you enroll in Medicare Advantage first and later want Medigap, an insurer may be able to review your health unless a guaranteed-issue right applies.

Read Medicare's Medigap guidance before assuming you can switch freely.

For a more focused comparison, see Medigap Plan G versus Medicare Advantage in Texas.

Prior authorization, referrals, and care coordination

Original Medicare and Medicare Advantage both apply coverage rules, but their administration differs. Medicare Advantage plans frequently require prior authorization for selected services, such as certain procedures, imaging, or post-acute care.

This can add steps before treatment is approved. Some beneficiaries appreciate the coordinated care and extra services offered by private plans; others prioritize broad provider choice and fewer network-related restrictions.

A useful question is not whether a plan has prior authorization at all, but which services you are likely to need and how approval works.

Ask how your existing specialists coordinate referrals, what happens when a physician leaves the network, and whether an ongoing course of treatment can continue during a plan transition.

Review the plan's official Evidence of Coverage rather than relying solely on a marketing summary.

What changes are possible later?

Medicare's annual fall enrollment period generally runs October 15 through December 7, allowing eligible people to change Medicare Advantage and Part D arrangements for the next year.

People already in Medicare Advantage also have a separate January 1 through March 31 opportunity to make certain changes.

These periods do not automatically guarantee the ability to buy Medigap without underwriting. Some events, such as a qualifying plan termination or certain trial rights, may create separate protections.

Before leaving a Medicare Advantage plan for Original Medicare, check whether you can obtain the Medigap policy you want and arrange prescription coverage. Do not cancel existing coverage before the new arrangement is confirmed.

Our Medicare enrollment periods guide explains the differences between these windows.

A practical Texas comparison checklist

Make a list of the physicians, specialists, hospitals, and pharmacies you use. Check each one against the actual plan documents.

Next, estimate annual costs under both a routine-care scenario and a high-use scenario. Include Part B, plan premiums, copayments, hospital charges, drug expenses, and the financial effect of a plan's out-of-pocket maximum.

If you spend part of the year outside Texas, consider routine access in both locations.

Finally, think about how you want to handle future changes. Medicare Advantage networks, drug formularies, and benefits can change each year.

Medigap premiums can also increase over time. Neither choice is automatically best for everyone.

The right option is one you understand, can afford, and can use with your preferred healthcare providers.

A decision framework based on your healthcare priorities

Start with physicians and hospitals. List your existing doctors, specialists, and facilities. If you want the flexibility to see Medicare-participating providers nationwide, Original Medicare may fit that priority.

If you prefer a particular Medicare Advantage plan, confirm each provider's network status and referral rules directly with the plan and office.

Then test a high-use medical year. Compare premiums and likely costs for a routine year with the cost of hospital care, specialist treatment, or outpatient procedures.

With Medicare Advantage, consider the annual out-of-pocket maximum for covered Part A and B services.

With Original Medicare, consider whether a Medigap policy would reduce unpredictable cost-sharing.

Finally, consider future flexibility. Ask what happens if you move, travel frequently, or later want to change coverage. Switching Medicare Advantage plans during an allowed period is different from qualifying to buy Medigap without underwriting.

This framework is not a ranking of insurers; it helps identify which tradeoffs matter to you.

Frequently Asked Questions

Can you use Medigap with Medicare Advantage?

No. Medigap does not pay Medicare Advantage copayments or coinsurance.

It is designed to supplement Original Medicare.

Does Medicare Advantage replace Medicare?

No. It is a Medicare-approved private-plan way to receive your Part A and Part B benefits.

Does Medicare Advantage cover emergencies outside Texas?

Medicare Advantage plans must cover qualifying emergency and urgently needed services under applicable Medicare rules. Routine nonemergency out-of-network care may be limited.

Is Original Medicare always more expensive?

No. Compare total premiums and expected cost-sharing, including any Medigap and Part D premiums.

Is Medicare Advantage always the cheaper option?

No. A low monthly premium can be offset by copayments and coinsurance when you use medical services.