What Is Medicare? Parts, Coverage & Enrollment Explained
Medicare is a federal health insurance program primarily for people age 65 and older.
It also covers some younger people with qualifying disabilities or certain medical conditions.
The first thing to understand is that Medicare isn't one single insurance plan. It has separate parts that cover different services, and you'll have choices about how you receive your benefits.
Quick answer: Medicare Part A covers hospital care and Part B covers doctor and outpatient care. Together they make up Original Medicare.
You can keep Original Medicare (often adding a drug plan and a Medicare Supplement policy), or get your benefits through a private Medicare Advantage plan instead.
The right choice depends on your doctors, prescriptions, budget and how much flexibility you want.
Who Qualifies for Medicare?
Most people become eligible when they turn 65, as long as they meet the program's citizenship or residency requirements.
Some people qualify before 65, including those who:
- Receive Social Security disability benefits – most people get Medicare automatically after 24 months of disability benefits.
- Have Amyotrophic Lateral Sclerosis (ALS) – Medicare starts as soon as disability benefits begin, with no 24-month wait.
- Have End-Stage Renal Disease (ESRD) – separate eligibility and coverage-start rules apply.
Medicare explains these rules on its page for people getting benefits before 65.
Being eligible doesn't mean every part of Medicare is free.
Your premiums and other costs depend on your work history, income and the coverage you choose.
New to Florida, or splitting time between states? Federal Medicare rules are generally the same nationwide. What can vary by state is which private plans are available, Medigap protections and certain assistance programs.
See moving to Florida with Medicare and Florida snowbirds and Medicare.
The Four Parts of Medicare
Each part of Medicare covers a different kind of care.
Helps cover inpatient hospital stays, skilled nursing facility care (when requirements are met), hospice and some home health care.
Most people pay no Part A premium because they or their spouse paid Medicare taxes while working. Deductibles and other costs still apply.
Helps pay for medically necessary doctor visits, outpatient care, preventive services and durable medical equipment.
Most people pay a monthly premium. After the annual deductible, you generally pay 20% of the Medicare-approved amount for many services.
Plans offered by private insurers approved by Medicare. They provide your Part A and Part B benefits instead of Original Medicare.
Most include prescription drug coverage, and many offer extra benefits. Rules and availability vary by plan and county.
Helps cover outpatient prescription medications.
With Original Medicare, you add Part D through a separate drug plan. Most Medicare Advantage plans include it.
Each plan has its own list of covered drugs, pharmacy network and cost-sharing.
Two Ways to Receive Your Medicare Coverage
Once you have Parts A and B, you generally choose between two paths.
Option 1: Original Medicare
Original Medicare is run by the federal government and includes Part A and Part B.
You can see any provider nationwide who accepts Medicare, and you generally don't need referrals for specialists.
Original Medicare alone has no annual out-of-pocket limit for Part A and Part B services.
That's why many people add a separate Part D drug plan and a Medicare Supplement (Medigap) policy, which can help pay many deductibles, coinsurance and copays.
Option 2: Medicare Advantage
Medicare Advantage delivers your Medicare-covered care through a private insurance plan.
To join one, you generally need both Part A and Part B and must live in the plan's service area.
Depending on the plan, you may have a provider network, referral requirements or prior authorization rules.
Every Medicare Advantage plan has an annual limit on out-of-pocket costs for covered Part A and Part B services. Many also include benefits Original Medicare doesn't routinely cover.
| Original Medicare | Medicare Advantage | |
|---|---|---|
| Who runs it | Federal government | Private insurer approved by Medicare |
| Doctors you can see | Nationwide Any provider that accepts Medicare | Network Usually limited to the plan's network |
| Specialist referrals | Not needed Generally no referrals | Varies Some plans require them |
| Annual out-of-pocket limit | None No limit for Part A and B services under Original Medicare alone. Medigap can help pay many of these costs. | Yes Limit on covered Part A and B services. Excludes premiums and generally Part D drug costs. |
| Prescription drugs | Add-on Separate Part D plan | Usually included Most plans include Part D |
| Extra benefits | Limited Routine dental, vision and hearing generally not covered | Often Many plans add some extras |
| Can add Medigap? | Yes Medigap works only with Original Medicare | No Medigap doesn't work with Advantage |
In short: Original Medicare generally offers broader provider access but may require separate coverage to help manage medical and prescription drug costs.
Medicare Advantage combines Part A and Part B benefits through a private plan, often with drug coverage, but provider networks and plan rules can affect how you receive care.
One timing detail matters a lot if you're leaning toward Original Medicare.
Your best window to buy a Medigap policy is usually the six months starting when you're 65 or older and enrolled in Part B. See our Florida Medigap open enrollment guide for how that window works.
Does Medicare Cover Everything?
No. Medicare covers many medically necessary services, but not every medical or personal care expense.
Original Medicare generally doesn't cover:
- Routine dental care and dentures
- Routine eye exams for prescription glasses
- Hearing aids and exams for fitting them
- Long-term custodial care
Limited exceptions apply in specific medical situations. See Medicare's full list of services Part A and Part B don't cover.
Knowing these gaps up front helps you decide whether additional coverage makes sense.
For dental and vision options, see how to get dental and vision coverage with Medicare in Florida.
When Should You Enroll in Medicare?
Most people first become eligible around their 65th birthday.
Your Initial Enrollment Period lasts seven months: the three months before your birthday month, your birthday month, and the three months after.
If your birthday falls on the first of the month, your eligibility and Initial Enrollment Period generally shift one month earlier.
Signing up in the three months before your birthday month generally lets coverage start in your birthday month. If you sign up in your birthday month or later, coverage generally starts the month after you sign up. How Medicare sets your start date.
Some people are enrolled automatically, usually because they already receive Social Security benefits. Others need to apply.
Missing your Initial Enrollment Period without other qualifying coverage can mean a delayed start and a late enrollment penalty for as long as you have Part B.
Still working at 65? If you have group health coverage based on current employment (yours or your spouse's), you may be able to delay Part B without a penalty.
Retiree coverage, COBRA, and individual plans generally don't qualify you for this Part B Special Enrollment Period, though some may still count as creditable drug coverage for Part D. See Social Security's rules on employer coverage and Part B.
Confirm your situation before you wait. Our guide to Medicare enrollment periods explains each window.
Drug coverage has its own rules. To delay Part D without a penalty, you generally need creditable prescription drug coverage, meaning coverage expected to pay, on average, as much as standard Medicare drug coverage.
Ready to apply? Here's how to sign up for Medicare.
What Should You Do Before Turning 65?
You don't need to choose every coverage option right away, but you should know which deadlines apply to you.
Worried about affording Medicare costs? Florida residents with limited income may qualify for help paying premiums and cost-sharing.
See how the Florida Medicare Savings Program works and what a Qualified Medicare Beneficiary is.
The Bottom Line
Medicare provides important health insurance protection, but understanding its parts is essential to making good decisions.
Start with what Parts A and B cover. Then compare Original Medicare and Medicare Advantage, including drug coverage and potential out-of-pocket costs.
Taking the time to understand these differences before you enroll can help you avoid unexpected coverage gaps and expenses.
Have questions about your own situation? A licensed Florida Medicare agent can walk you through your options at no cost.
Official resource: Medicare.gov – Medicare basics.
With over 20 years of experience, Mark Prip is a dedicated licensed Medicare insurance agent in Florida. His expertise lies in simplifying the Medicare coverage process by providing comprehensive education to beneficiaries.
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