What Is Medicare?
Medicare is a federal health insurance program administered by the Centers for Medicare & Medicaid Services (CMS). It primarily serves Americans age 65 and older, but also covers younger individuals with certain qualifying disabilities or medical conditions. Understanding Medicare is the first step toward making smart decisions about your healthcare as you approach eligibility.
Who Qualifies for Medicare?
You may be eligible for Medicare if you fall into one of the following categories:
- Age 65 or older — Most people become eligible when they turn 65, regardless of whether they are still working.
- Under 65 with a qualifying disability — If you have received Social Security Disability Insurance (SSDI) benefits for 24 months, you automatically become eligible for Medicare.
- Any age with End-Stage Renal Disease (ESRD) — People with permanent kidney failure requiring dialysis or a transplant qualify for Medicare at any age.
- Any age with ALS (Lou Gehrig's Disease) — Individuals diagnosed with ALS qualify for Medicare immediately upon receiving SSDI benefits.
The Four Parts of Medicare
Medicare is divided into four distinct parts, each covering different types of healthcare services:
| Part | Name | What It Covers |
|---|---|---|
| Part A | Hospital Insurance | Inpatient hospital stays, skilled nursing facility care, hospice, and some home health care |
| Part B | Medical Insurance | Doctor visits, outpatient care, preventive services, and durable medical equipment |
| Part C | Medicare Advantage | An all-in-one alternative to Original Medicare offered through private insurers |
| Part D | Prescription Drug Coverage | Prescription medications, available as a standalone plan or bundled with Part C |
Original Medicare vs. Medicare Advantage
When you become eligible, you'll choose between two main coverage paths:
- Original Medicare (Parts A & B) is managed directly by the federal government. You can see any doctor or hospital that accepts Medicare, and you may add a Part D drug plan and/or a Medigap supplement for additional coverage.
- Medicare Advantage (Part C) is offered through private insurance companies approved by Medicare. These plans bundle Parts A, B, and usually D together, and often include extra benefits like dental, vision, and hearing.
Is Medicare Free?
Medicare is not entirely free, but many beneficiaries pay little or nothing for certain parts. Most people who have worked and paid Medicare taxes for at least 10 years (40 quarters) pay no premium for Part A. Part B requires a monthly premium, which is set each year by CMS. Part C and Part D costs vary by plan.
When Should You Think About Medicare?
It's wise to start researching Medicare at least six months before your 65th birthday. This gives you time to understand your options, compare plans available in your area, and avoid missing key enrollment deadlines — which can result in permanent premium penalties.
Next Steps
Once you understand the basics, explore our enrollment guides to learn exactly how to sign up, claim your Medicare card, and choose the plan that best fits your health needs and budget.