Start with what you already know about yourself

Choosing a Medicare plan means matching your health needs, budget, and doctor preferences to one of several real options. You do not have to pick the "best" plan overall — you have to pick the one that works for your situation. That starts with three honest answers: How often do you see a doctor? Do you take regular medications? Are there specific doctors or hospitals you want to keep?

Write these down. If you see a cardiologist monthly and take five medications, your needs are different from someone who sees a doctor once a year for a checkup. If you have a doctor you trust and want to stay with them, that narrows your choices. If cost is your main worry and you are healthy, that points toward a different plan than if you have chronic conditions and can afford higher premiums.

Your age and when you first became may be able to access for Medicare also matter. Most people turn 65 and have a seven-month window to choose — three months before the month you turn 65, the month itself, and three months after. If you miss that window, you may pay a penalty for life. If you are under 65 and on disability, the rules are different. Knowing your own timeline prevents costly mistakes.

Key Takeaways

  • The four main Medicare plan types — Original Medicare, Medicare Advantage, Medigap, and Part D — cover different things and cost different amounts depending on your health and prescriptions.
  • Original Medicare (Parts A and B) covers hospital and doctor visits but leaves you paying 20 percent of costs; Medigap fills those gaps but costs more in premiums.
  • Medicare Advantage bundles hospital, doctor, and prescription coverage into one plan but usually requires using in-network doctors and has annual out-of-pocket limits.
  • You can compare actual plans, costs, and which doctors accept each plan using Medicare.gov's Plan Finder tool or by calling 1-800-MEDICARE.
  • Your choices reset every year during Open Enrollment (October 15 to December 7), so you can switch plans if your needs or costs change.

Understand the four main plan types

Original Medicare is run by the federal government and covers hospital stays (Part A) and doctor visits (Part B). You pay a monthly premium for Part B, and Medicare pays its share of approved costs. You then pay the rest — 20 percent of most services after you meet your deductible. This gives you freedom to see any doctor who accepts Medicare, but your out-of-pocket costs can be high if you have a serious illness.

Medicare Advantage (Part C) is sold by private insurance companies and bundles hospital, doctor, and prescription coverage into one plan. You pay a monthly premium, usually lower than Original Medicare plus Medigap, and your out-of-pocket costs are capped each year. The trade-off: you usually must use doctors and hospitals in the plan's network, and you need approval before certain procedures. If you travel or see specialists often, this can be frustrating.

Medigap (supplemental insurance) works alongside Original Medicare. You keep Parts A and B and add a Medigap policy to cover the 20 percent and other gaps. Medigap premiums are higher than Medicare Advantage, but you can see any doctor who accepts Medicare and have predictable costs. Medigap makes sense if you have a doctor you want to keep and can afford the premium.

Part D covers prescription drugs and is separate from all three above. If you choose Original Medicare or Medigap, you must add Part D or pay a penalty later. Medicare Advantage plans usually include drug coverage, so you do not buy Part D separately. Part D plans vary widely in which drugs they cover and how much you pay, so comparing them matters even if everything else stays the same.

Compare costs the way they actually work

Plan costs have four parts: monthly premium, annual deductible, copays or coinsurance, and out-of-pocket maximum. A low premium does not mean low total cost. A plan with no premium might have a high deductible and high copays. A plan with a high premium might cap your yearly costs at $3,000, while another plan with a lower premium could leave you paying $8,000 in a year when you need surgery.

Use Medicare.gov's Plan Finder to enter your medications and see what each plan would actually cost you. Type in the drugs you take, and the tool shows you the premium, what you pay at the pharmacy, and your estimated yearly total. This is the only way to compare apples to apples. Do not rely on what a plan costs "on average" — you need to know what it costs you.

If cost is very tight, ask about Extra Help, a federal program that covers Part D premiums and copays for people with limited income. You can learn whether you may be may be able to access by calling 1-800-MEDICARE or visiting your local Social Security office. The income limits vary by state and change yearly, so it is worth checking even if you think you earn too much.

Check which doctors and pharmacies are in each plan

If you have a doctor you see regularly, call that doctor's office and ask which Medicare plans they accept. Do not assume they accept all of them — some doctors only take certain Medicare Advantage plans or only Original Medicare. If your doctor is not in the plan's network, you will either have to pay out-of-network rates or switch doctors.

For Medicare Advantage plans, also check whether your preferred hospital and pharmacy are in-network. Some plans have narrow networks that do not include major hospitals in your area. If you use a specialty pharmacy for a medication, confirm it is covered before you enroll. Switching plans mid-year because your pharmacy is not covered is frustrating and avoidable.

Medicare.gov's Plan Finder lets you search by doctor name and shows you which plans they accept. You can also call the plan directly — the phone number is on Medicare.gov — and ask whether a specific doctor is in-network. Write down the names and dates of these calls in case you need to refer back to them later.

Know your enrollment windows and important date

Most people have a seven-month Initial Enrollment Period when they first turn 65: three months before, the month of, and three months after their birthday. If you miss this window, you pay a penalty on your Part B and Part D premiums for as long as you have Medicare. The penalty is small each month but adds up over years, so getting it right the first time matters.

After your initial enrollment, you can change plans once a year during Open Enrollment, which runs from October 15 to December 7. Changes take effect January 1. If you have a Medicare Advantage plan and want to switch to Original Medicare, you have an extra window: January 1 to February 14. This is useful if your network became too narrow or your costs went up.

If you have a major life change — you move, lose employer coverage, or your income drops — you may have a Special Enrollment Period that lets you change plans outside the normal windows. Call 1-800-MEDICARE to ask whether your situation qualifies. Do not wait; these windows are usually 60 days.

Understand what happens after you choose

Once you enroll, your plan sends you a welcome packet with your member ID card, a list of in-network doctors and pharmacies, and your plan's rules. Read the part about prior authorization — some plans require you to get approval before certain procedures or specialist visits. If you do not get approval first, you may have to pay the full cost yourself.

Your plan also sends you a formulary, which is the list of drugs it covers and how much you pay for each. Formularies change every year, so a drug that was cheap last year might be expensive this year, or it might not be covered at all. If your medication is not on the formulary or is in a high-cost tier, call the plan and ask about alternatives or whether they will make an exception.

Keep your member ID card with you at every doctor visit and pharmacy visit. If you lose it, call the plan's customer service number and ask them to mail a replacement or give you a temporary number you can use when ready.

Frequently Asked Questions

Can I switch plans if I change my mind after I enroll?

Yes, but only during Open Enrollment (October 15 to December 7) or if you have a may have access to life event. If you enrolled in a Medicare Advantage plan and want to switch to Original Medicare, you have an extra window from January 1 to February 14. Outside these windows, you are locked in until the next Open Enrollment.

What if my doctor leaves the plan's network after I enroll?

Call your plan when ready and ask about your options. Some plans let you continue seeing an out-of-network doctor at in-network rates for a limited time. If not, you can switch to a different plan outside the normal enrollment window — this counts as a may have access to event. Document the date your doctor left the network.

Do I have to choose a plan, or can I just use Original Medicare?

Original Medicare is automatic — you get Part A at 65 with no action needed. You must actively enroll in Part B, and you must choose a Part D plan or pay a penalty later. You do not have to choose Medicare Advantage or Medigap, but most people add one or the other to cover costs Original Medicare leaves behind.

What if I cannot afford any plan?

Ask about Extra Help for Part D costs and Medicaid for other expenses. Medicaid rules vary by state, but some states cover Medicare premiums and copays for people with very low income. Call your state Medicaid office or 1-800-MEDICARE to learn what you may be may be able to access for.

How do I know if my medications will be covered?

Use Medicare.gov's Plan Finder and enter each medication you take. The tool shows you which plans cover each drug, what tier it is on, and what you will pay. If a drug is not covered, call the plan and ask whether they will make an exception or suggest a covered alternative your doctor approves.