What Is Medicare and How Does It Work?

Medicare is federal health insurance mainly for people 65 and older, although some people qualify earlier because of a disability or certain medical conditions.

If you're preparing for Medicare in Texas, the first decision isn't which insurance company to call.

It's understanding how Medicare pays for care, which expenses remain your responsibility, and what choices you can make about your coverage.

The four parts of Medicare

Medicare Part A is hospital insurance. It helps cover inpatient hospital care, skilled nursing facility care when eligibility requirements are met, hospice, and certain home health services.

Part A does not mean every hospital bill is paid in full: deductibles and coinsurance can apply, and observation services at a hospital may be billed under Part B instead of Part A.

Part B is medical insurance. It covers many physician visits, outpatient procedures, preventive services, diagnostic tests, durable medical equipment, and certain medications administered in clinical settings.

Most people pay a monthly Part B premium. Under Original Medicare, many covered Part B services leave you responsible for 20% of the Medicare-approved amount after the annual deductible.

Part C is Medicare Advantage. These plans are offered by Medicare-approved private insurers as another way to receive Part A and Part B benefits.

Many include Part D drug coverage. Part D is outpatient prescription drug insurance, available through standalone plans with Original Medicare or through many Medicare Advantage plans.

Original Medicare versus Medicare Advantage

Original Medicare consists of Parts A and B, administered by the federal government. You can generally use any physician or hospital nationwide that accepts Medicare.

There are no routine Medicare Advantage-style provider networks. However, Original Medicare alone has no annual out-of-pocket limit for covered Part A and B services.

People who choose Original Medicare may add a standalone Part D plan and, if eligible, a Medicare Supplement policy, also called Medigap. Medigap helps pay certain deductibles, coinsurance, and copayments left by Original Medicare.

It is not the same as Medicare Advantage, and you cannot use a Medigap policy to pay a Medicare Advantage plan's cost-sharing.

Medicare Advantage plans have an annual out-of-pocket limit for covered Part A and B services, but provider networks, referrals, prior authorization requirements, and cost-sharing can vary.

A plan with a low premium may still expose you to significant costs when you use care.

Compare total costs and provider access, not just monthly premiums.

What Medicare does not automatically cover

Original Medicare generally does not cover routine dental care, routine vision exams for glasses, hearing aids, or long-term custodial nursing home care. Some Medicare Advantage plans offer additional benefits, but their availability and limitations differ.

Medicare also does not automatically include outpatient drug coverage under Parts A and B.

A common misunderstanding is that Medicare will pay for all healthcare expenses once you turn 65. It does not.

Before choosing coverage, review your medications, specialists, hospitals, and expected costs in a high-use year, not just in a healthy year.

Medicare Supplement insurance can help with certain Original Medicare cost-sharing, but it is separate from Medicare Advantage.

When Medicare begins

For many people, Medicare eligibility starts at 65. The Initial Enrollment Period generally spans seven months around the month you turn 65.

Some people receiving Social Security benefits are automatically enrolled, while others need to apply through Social Security. Different timing can apply when your birthday is on the first of a month.

If you or your spouse have coverage based on current employment, you may be able to delay Part B without a penalty. COBRA and retiree coverage generally do not protect you in the same way.

Confirm the rules before delaying Part B, particularly if you work for a smaller employer.

How to make a coverage decision in Texas

Begin by confirming your Medicare effective dates. Next, list every physician and hospital you want to use, including specialists outside your home county.

Check your prescription drugs by name and dosage. Then compare Original Medicare with optional Medigap and Part D against Medicare Advantage plans available at your Texas residential address.

Medicare's federal rules apply across Texas, but private-plan availability, premiums, and networks vary by location. A Medicare Advantage plan available in Dallas may not be available in El Paso.

Your ZIP code matters when comparing private coverage. Also consider future flexibility: getting Medigap after your initial protected enrollment window may involve medical underwriting unless a specific guaranteed-issue right applies.

How Medicare bills are paid in practice

Suppose you visit a specialist who accepts Medicare assignment. Under Original Medicare, the clinician submits a claim to Medicare.

Medicare determines the approved amount for the covered service, applies any remaining Part B deductible, and generally pays 80% of the approved amount after the deductible.

You ordinarily owe the other 20%, unless another policy pays some or all of that share.

This is why two people with the same Medicare card can face very different out-of-pocket bills: one may have a Medigap policy, while another has only Parts A and B.

Inpatient hospital care follows Part A rules rather than the standard Part B 80/20 structure. Part A has a deductible tied to a benefit period, and longer hospital or skilled nursing stays may create additional cost-sharing.

Medicare does not cover every service a provider recommends, and coverage depends on medical necessity and other program rules. Review Medicare's coverage information before assuming a procedure or service will be paid.

What does a typical Medicare budget include?

Start with the monthly Part B premium. Add any premium for Part A, if you do not qualify for premium-free hospital coverage.

Then include a possible Medigap premium or Medicare Advantage premium, any Part D premium, and your expected copayments or coinsurance. Prescription costs can change dramatically depending on the drugs you take and the plan formulary.

A $0-premium Medicare Advantage plan does not mean $0 total medical spending, just as a higher-premium Medigap policy does not mean every healthcare expense is covered.

For a realistic comparison, estimate spending in a healthy year and in a year with hospital care, repeated specialist visits, or expensive prescriptions. Also consider how much unpredictability you can comfortably absorb.

If you travel frequently between Texas and other states, verify whether a plan provides routine nonemergency access outside its local service area.

What if you need help paying Medicare costs?

Some people with limited income and resources qualify for a Medicare Savings Program, which may help with Part B premiums and sometimes other Medicare cost-sharing.

The federal Extra Help program can lower prescription drug expenses for qualifying individuals.

Texas residents can apply for certain benefits through YourTexasBenefits. Eligibility rules and income limits change, so check the current requirements rather than relying on old figures.

Three mistakes to avoid when first choosing coverage

First, do not compare plans only by premium. A plan's provider network, prior authorization rules, drug formulary, and out-of-pocket maximum can matter more than the advertised price.

Second, do not assume you can buy Medigap later without health questions. The initial federal Medigap enrollment protection is especially valuable.

Third, do not overlook Part D because you currently take no medications; a late-enrollment penalty may apply if you go without qualifying creditable drug coverage.

For a clear starting point, review Medicare.gov's getting-started guide and use the official Medicare Plan Finder to examine plans in your Texas ZIP code.

Those resources are useful even when you plan to work with a licensed insurance agent.

A practical starting point: three decisions before choosing a plan

For someone approaching Medicare eligibility, the first useful question is not which insurance company has the lowest premium. Start by identifying whether they have employer coverage and when they expect to retire.

Those facts determine whether Medicare must begin soon and whether an enrollment delay might be appropriate. Then separate the decisions: first, establish Part A and Part B eligibility and effective dates; second, decide between Original Medicare and Medicare Advantage; third, address supplemental and prescription coverage as applicable.

For example, a Texas resident turning 65 next month with no employer coverage faces a different enrollment decision from a 67-year-old still working with qualifying group insurance.

Both may ultimately choose the same type of Medicare coverage, but the steps and deadlines are different.

Use the eligibility guide and timing guide to identify the appropriate starting point.

Frequently Asked Questions

Is Medicare free at age 65?

Not usually. Part A is premium-free for many people, but Part B generally has a monthly premium and Medicare cost-sharing may apply.

Is Medicare Advantage extra insurance added to Original Medicare?

No. Medicare Advantage is an alternative way to receive Medicare Part A and Part B benefits through a Medicare-approved private plan.

Do you need a Part D prescription drug plan?

It depends on your coverage and medications. Going without Part D or other creditable drug coverage can result in a future late-enrollment penalty.

Can you see any doctor with Medicare?

With Original Medicare, you can generally see providers nationwide who accept Medicare. Medicare Advantage plans may use networks and other coverage rules.

Can you change Medicare coverage later?

Certain changes are allowed during applicable enrollment periods, but switching to Medigap later may involve medical underwriting unless you have a protected right.