Medicare Enrollment Checklist: Documents and Steps You Need
Starting Medicare is easier when you know which enrollment period applies, when your current insurance ends, and what information Social Security may need.
What Is Medicare? A Simple Guide to Medicare in 2026
Last Modified: 10/05/2026 | Reviewed by Keith Armbrecht (NPN 634015)
Quick Summary
Medicare is the federal health insurance program primarily for people age 65 or older, as well as certain younger people who qualify because of disability or specific medical conditions.
Original Medicare consists of Part A (Hospital Insurance) and Part B (Medical Insurance).
You can receive Medicare through Original Medicare or choose to receive Medicare-covered benefits through a private Medicare Advantage plan. Prescription drug coverage is available through Medicare Part D.
Key Facts
- Medicare is federal health insurance.
- Most people become eligible around age 65.
- Some people qualify before 65.
- Part Aprimarily covers inpatient hospital care and certain other services.
- Part Bcovers doctors, outpatient services and other medical services.
- Part Dprovides prescription drug coverage.
- Medicare Advantage (Part C)is another way to receive Medicare benefits.
- Medigap works with Original Medicare to help cover certain out-of-pocket costs.
- Medicare isn’t the same as Medicaid.
- Medicare doesn’t cover every healthcare expense.
- Enrollment timing matters
The Four Parts of Medicare
Medicare Part A — Hospital Insurance
Part A helps cover inpatient hospital care, skilled nursing facility care under qualifying circumstances, hospice and certain home healthcare.
Medicare Part B — Medical Insurance
Part B helps cover doctors, outpatient care, preventive services, durable medical equipment and other medically necessary services.
Medicare Part C — Medicare Advantage
Medicare Advantage plans are offered by private Medicare-approved insurance companies and provide Part A and Part B benefits through the plan.
Medicare Part D — Prescription Drugs
Part D helps cover outpatient prescription medications.
Your Two Main Medicare Paths
Original Medicare
Part A + Part B
You can generally add:
Medicare Supplement + Part D
Medicare Advantage
A private Medicare-approved plan provides your Medicare Part A and Part B benefits. Many plans also include prescription drug coverage.
Video Explanation from Keith
Medicare Explained Simply
Keith's Take
Medicare becomes much easier once you stop trying to learn everything at once.
Start with one decision:
How do you want to receive your Medicare coverage?
For most people, the conversation eventually comes down to:
Original Medicare + Medicare Supplement + Part D
versus
Medicare Advantage
Understand those two paths first. Then the rest of Medicare starts making much more sense.
Keith Armbrecht
Medicare on Video
Frequently Asked Questions About Medicare
Q. What age does Medicare start?
A. For most people, Medicare eligibility begins at 65.
Q. Is Medicare free?
A. No. Although many people qualify for premium-free Part A, Medicare has premiums, deductibles and other cost sharing.
Q. What is Original Medicare?
A. Medicare Part A and Part B.
Q. Is Medicare Advantage the same as Medicare?
A. Medicare Advantage is a private-plan option for receiving your Medicare Part A and Part B benefits.
Q. Is Medigap part of Medicare?
A. Medigap is private supplemental insurance that works with Original Medicare.
Q. Does Medicare cover prescriptions?
A. Part D provides prescription drug coverage. Many Medicare Advantage plans also include drug coverage.
Q. Do I automatically get Medicare at 65?
A. Some people do and some must actively enroll. It largely depends on whether you're already receiving qualifying Social Security or Railroad Retirement Board benefits.
Official Government Sources
Explore Related Guides
Medicare Effective Dates: When Does Your Coverage Start?
Your Medicare effective date depends on when you enroll and which Medicare enrollment period you’re using.
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Need Help With Medicare?
Medicare on Video can help you understand your Medicare choices at no cost to you.
GET MEDICARE HELP
Call 877-885-3484.
SSA describes Medicare as the U.S. health insurance program for people 65+ while also noting younger eligibility in certain circumstances.