Turning 65 in Houston? Or helping a parent through the process? Sooner or later you will hit the big question: Medicare Advantage or Medicare Supplement? They sound alike but are built differently, and the right choice can change what you pay, which doctors you see and how predictable your costs are.
First, what Original Medicare does and does not cover
Original Medicare has two parts: Part A (hospital care) and Part B (doctor visits and outpatient services). It does not cover everything. You generally pay deductibles and coinsurance, there is no annual cap on your out-of-pocket costs, and routine dental, vision and hearing are mostly excluded. Both Medicare Advantage and Medicare Supplement exist to address these gaps, but in different ways.
What is Medicare Advantage (Part C)?
A Medicare Advantage plan replaces Original Medicare with a private plan approved by Medicare. It bundles hospital and medical coverage and often includes prescription drug coverage (Part D) plus extras such as dental, vision and fitness benefits. These plans typically use networks (HMO or PPO), have an annual out-of-pocket maximum, and many carry a low or $0 monthly premium beyond your Part B premium.
What is Medicare Supplement (Medigap)?
A Medicare Supplement plan works alongside Original Medicare. After Medicare pays its share, the Medigap plan pays some or all of the remaining costs such as deductibles and coinsurance, depending on the plan letter you choose. You keep Original Medicare, you can generally see any doctor or hospital that accepts Medicare, and your costs are very predictable. Monthly premiums are typically higher, and Medigap does not include prescription drug coverage, so most people add a separate Part D plan.
Medicare Advantage vs. Medicare Supplement at a glance
| Feature | Medicare Advantage | Medicare Supplement |
|---|---|---|
| Works with | Replaces Original Medicare | Works with Original Medicare |
| Monthly premium | Often low or $0 (plus Part B) | Typically higher (plus Part B) |
| Doctor choice | Plan network | Any provider accepting Medicare |
| Out-of-pocket limit | Yes, annual maximum | Covers many Medicare cost-sharing amounts |
| Drug coverage | Often included | Separate Part D plan needed |
| Extras (dental, vision) | Often included | Usually not included |
Why your location matters in Houston
Medicare Advantage plans are offered county by county, so what is available in Harris County can differ from Fort Bend, Montgomery or Brazoria. Many use local networks, so check whether your doctors and hospitals (including those in the Texas Medical Center) participate. Medicare Supplement plans are not network-based and work with any provider that accepts Medicare, which can matter if you split time between Houston and another state.
Which one fits you best?
Medicare Advantage may fit if you want lower monthly premiums, like having extra benefits bundled together, are comfortable staying in a network, and are generally in good health.
Medicare Supplement may fit if you want freedom to choose providers, prefer predictable costs, travel often, or expect to need frequent care.
Know the enrollment windows
- Initial Enrollment Period: a 7-month window around your 65th birthday (three months before, your birthday month, and three months after).
- Medigap open enrollment: a 6-month period that begins the month you are 65 or older and enrolled in Part B. During this time, you generally cannot be turned down or charged more because of health conditions. After it ends, insurers in many cases can use medical underwriting.
- Annual Enrollment Period: October 15 to December 7 each year, when you can switch Medicare Advantage or Part D plans for the following year.
- Medicare Advantage Open Enrollment: January 1 to March 31, for people already in a Medicare Advantage plan who want to switch.
You cannot use a Medicare Supplement plan together with a Medicare Advantage plan, so you must choose one path.
Frequently asked questions
Can I switch later?
You can often change Medicare Advantage plans during the enrollment windows above. Moving to a Medigap plan later may involve health questions, which is why many people decide early.
Do I need Part D with a Medicare Supplement plan?
Yes. Medigap plans do not include prescription drug coverage, so most people pair one with a standalone Part D plan.
Is there a cost to talk with an agent?
No. A licensed agent can explain your options, compare available plans and help with enrollment at no cost to you. Explore our Medicare plans page or contact a licensed agent to get started.
We do not offer every plan available in your area. For a complete list of options, contact Medicare.gov, 1-800-MEDICARE, or your local State Health Insurance Assistance Program (SHIP).
This article is for general educational purposes only and is not insurance, legal, tax or financial advice. Plan availability, costs, rules and dates vary and can change. Cover H-Town does not offer every plan available in your area. Talk with a licensed agent about your situation.
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