Medicare is the federal health insurance program that covers about 69 million Americans. Most people will use it at some point in their lives, so understanding how it works now can save you a lot of stress and money later. Here is everything you need to know, broken down simply.
What Is Medicare?
Medicare is a government-run health insurance program for people who are 65 or older, have certain disabilities, or have specific chronic illnesses. It is generally much more affordable than private insurance and is accepted by almost every doctor and hospital in the country.
Key things to know upfront:
- Medicare covers individuals only, not families
- It is broken into separate “Parts,” each covering different types of care
- Almost all healthcare providers accept it, which means you rarely have to worry about out-of-network costs
How Is Medicare Funded?
You have been helping pay for Medicare your whole working life. Here is where the money comes from:
- General tax revenue (46%) — income taxes, estate taxes, and other government funds
- Payroll taxes (34%) — both you and your employer pay Medicare taxes out of every paycheck; self-employed workers pay the full amount themselves
- Premiums (15%) — some enrollees pay monthly premiums depending on which parts they sign up for
- Other sources (5%) — taxes on Social Security benefits, state payments, and interest
The Four Parts of Medicare
Part A — Hospital Insurance
This covers the serious stuff:
- Inpatient hospital stays
- Hospice care
- Skilled nursing facilities
- Some at-home healthcare
Most people pay $0 in monthly premiums for Part A if they worked and paid Medicare taxes for at least 10 years. The 2026 hospital deductible is $1,736. After 60 days in a hospital, you pay $434 per day out of pocket.
Part B — Medical Insurance
This covers everyday medical care:
- Doctor visits and outpatient services
- Medical equipment like wheelchairs
- Some home health services
The standard 2026 monthly premium is $202.90 for most people. Higher earners pay more. The annual deductible is $283, and after that you pay 20% of covered costs.
Part C — Medicare Advantage
This is an alternative to Parts A and B offered through private insurance companies:
- Covers everything Parts A and B cover, usually including prescription drugs
- You must use in-network doctors in most cases
- The average monthly premium in 2026 is just $14
- About 54% of eligible Medicare recipients choose this option over Original Medicare
- You cannot use Medigap if you have Part C
Part D — Prescription Drug Coverage
This is optional coverage, also through private insurers, that helps pay for medications:
- The average 2026 monthly premium is $34.50
- The deductible is capped at $615
- Once you hit $2,100 in out-of-pocket drug costs in 2026, your coverage pays 100% for the rest of the year — that is the catastrophic coverage cap
What Is Medigap?
If you have Original Medicare (Parts A and B), you can add a Medigap policy to help cover what Medicare does not pay:
- Helps with copayments, deductibles, and coinsurance
- Works with any doctor or hospital that accepts Medicare
- Offered through private insurers but plans are standardized by the government — meaning the same plan type gives you the same benefits no matter who sells it
- There are 10 different Medigap plans to choose from
- The most popular plan (Plan G) costs between $96 and $507 per month depending on where you live
- You cannot use Medigap alongside Medicare Advantage
Who Qualifies for Medicare?
You can qualify in three ways:
- You turn 65
- You have a qualifying disability
- You have end-stage renal disease or ALS
Basic requirements for everyone:
- Must be a U.S. citizen or a legal permanent resident who has lived in the U.S. for at least five continuous years
- For free Part A coverage, you generally need 40 work credits (roughly 10 years of working and paying Medicare taxes)
When Should You Enroll?
Missing your enrollment window can cost you. Here are the key periods:
- Initial Enrollment Period (IEP): A 7-month window that starts 3 months before your 65th birthday and ends 3 months after. This is the most important window to know.
- General Enrollment Period (GEP): January 1 through March 31 each year, for people who missed their IEP. Late penalties may apply.
- Open Enrollment Period (OEP): October 15 through December 7 each year. This is when you can switch between plans.
- Special Enrollment Period (SEP): Triggered by life events such as losing employer coverage or moving. Enrolling during an SEP protects you from late penalties.
Missing your IEP and enrolling late typically results in a permanent penalty added to your monthly Part B and Part D premiums. That extra cost does not go away.
The Bottom Line
Medicare is not as complicated as it looks once you break it down into parts. The smartest move is to plan ahead, understand which parts you need, and enroll on time. Missing deadlines or choosing the wrong combination of coverage can cost you thousands of dollars per year. Start learning now so that when the time comes, you are ready.
