Medicare Basics: What You Need to Know
If you're approaching 65 or helping a loved one navigate Medicare for the first time, this is the place to start. No jargon, no confusion — just clear answers.
What Is Medicare?
Medicare is the federal health insurance program for people 65 and older, as well as certain younger people with disabilities or specific medical conditions. It is run by the Centers for Medicare & Medicaid Services (CMS) and funded through payroll taxes, premiums, and general government revenue.
Who It's For
Americans 65 and older, plus people under 65 with qualifying disabilities, End-Stage Renal Disease (ESRD), or ALS.
How It's Structured
Medicare is divided into parts — A, B, C, and D — each covering different types of care. Most people use a combination of parts.
What It Costs
Part A is usually free. Part B has a monthly premium (~$202.90/month in 2024). Costs vary based on income and the plan you choose.
The Four Parts of Medicare at a Glance
Think of Medicare like building blocks — each part covers something different.
- Hospital stays
- Skilled nursing facility
- Hospice care
- Some home health
- Doctor visits
- Outpatient care
- Preventive services
- Medical equipment
- Combines A + B
- Often includes Part D
- May add dental/vision
- Private insurance plans
- Prescription drugs
- Generic medications
- Brand-name drugs
- Specialty medications
Who Qualifies for Medicare?
You Qualify If You Are…
- 65 or older and a U.S. citizen or permanent legal resident (5+ years)
- Under 65 with a qualifying disability and have received Social Security Disability Insurance (SSDI) for 24 months
- Any age with End-Stage Renal Disease (permanent kidney failure requiring dialysis or transplant)
- Any age with ALS (Lou Gehrig's disease) — Medicare begins the month disability benefits start
Part A Is Free If You…
- Worked and paid Medicare taxes for at least 10 years (40 quarters)
- Are married to someone who worked 40+ quarters
- Are a widow/widower of someone who worked 40+ quarters
- Are divorced from someone who worked 40+ quarters (if married 10+ years)
When Should You Enroll?
Timing matters. Missing your window can mean permanent penalties and coverage gaps.
3 Months Before Your 65th Birthday
Best Time to EnrollYour Initial Enrollment Period (IEP) opens. This is the best time to sign up — coverage starts the month you turn 65 with no gaps.
The Month You Turn 65
Still On TimeYou can still enroll, but coverage may be delayed by 1–3 months depending on when in the month you sign up.
Up to 3 Months After Your 65th Birthday
Delay PossibleStill within your IEP, but coverage will be delayed. Enroll as early as possible to avoid gaps.
After Your IEP Closes
Penalties May ApplyYou'll need to wait for the General Enrollment Period (Jan 1–Mar 31) and may face permanent late enrollment penalties on Part B and Part D.
Still Working at 65? Here's What You Need to Know
If you or your spouse are still working and covered by an employer group health plan, you may be able to delay Medicare enrollment without penalty — but the rules depend on the size of your employer. Companies with fewer than 20 employees require you to enroll in Medicare on time. Larger employers may allow you to delay. Getting this wrong can be costly. Call me before you decide.
Original Medicare vs. Medicare Advantage
One of the biggest decisions you'll make is how to receive your Medicare benefits.
Original Medicare
Parts A + B (+ optional Part D)
Advantages
- Use any doctor or hospital that accepts Medicare nationwide
- No referrals needed to see specialists
- Predictable coverage — same benefits everywhere
- Pairs with a Medigap (Supplement) plan to cover gaps
Considerations
- ✕No cap on out-of-pocket costs without a Supplement plan
- ✕Doesn't include dental, vision, or hearing
- ✕Requires a separate Part D plan for prescriptions
Medicare Advantage
Part C — All-in-One Private Plans
Advantages
- Often $0–$60 monthly premium
- Usually includes prescription drug coverage
- May include dental, vision, and hearing
- Annual out-of-pocket maximum protects you from catastrophic costs
Considerations
- ✕Must use plan's network of doctors and hospitals
- ✕May require referrals to see specialists
- ✕Benefits and networks can change each year
- ✕May require prior authorization for some services
Frequently Asked Questions
Do I have to sign up for Medicare when I turn 65?
Not necessarily. If you have qualifying employer coverage, you may be able to delay without penalty. However, if you're not covered by an employer plan, you should enroll during your Initial Enrollment Period to avoid late penalties.
Is Medicare free?
Part A is free for most people. Part B has a standard monthly premium of $174.70 in 2024. Part D and Medicare Advantage plans have their own premiums. Higher-income individuals pay more through IRMAA surcharges.
Can I keep my current doctor with Medicare?
With Original Medicare, you can see any doctor who accepts Medicare — which is most doctors nationwide. With Medicare Advantage, you're generally limited to the plan's network, so it's important to verify your doctor is in-network before enrolling.
What's the difference between Medicare and Medicaid?
Medicare is federal health insurance based on age or disability — you earn it through work history. Medicaid is a joint federal-state program based on income and financial need. Some people qualify for both (called "dual eligible").
Does Medicare cover prescriptions?
Original Medicare (Parts A and B) does not cover most prescription drugs. You need to add a Part D plan or choose a Medicare Advantage plan that includes drug coverage.
Can I change my Medicare plan after I enroll?
Yes. During the Annual Enrollment Period (October 15 – December 7), you can switch between Original Medicare and Medicare Advantage, or change your Part D plan. Changes take effect January 1.
Ready to Go Deeper?
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