There is no single "best" plan because the right choice depends on your health needs, where you live, and what you can afford to pay
Medicare offers four main types of coverage: Original Medicare (Parts A and B), Medicare Advantage (Part C), Medigap (supplemental insurance), and Part D (prescription drug coverage). Some seniors use Original Medicare with a Medigap policy. Others choose Medicare Advantage, which bundles hospital, medical, and often drug coverage into one plan. The plan that works for you depends on whether you see many doctors, take expensive medications, prefer a specific hospital or doctor, and how much you want to spend out of pocket each month.
This guide explains what each type covers, what it costs, and how to think through which might fit your situation. It does not tell you which plan to choose — that decision is yours, based on your health and your budget.
Key Takeaways
- Original Medicare covers hospital and medical care but leaves you responsible for deductibles and coinsurance; Medigap fills those gaps but costs extra each month.
- Medicare Advantage plans bundle coverage into one monthly premium and often include prescription drugs, but usually require you to use doctors and hospitals in their network.
- Part D prescription drug coverage is separate from all other plans and must be chosen during your enrollment period or you may pay a penalty later.
- Your best option depends on your doctors, your medications, how often you use healthcare, and what monthly costs you can manage.
- You can change plans once a year during the Annual Enrollment Period (October 15 to December 7), so your choice now does not lock you in forever.
Original Medicare with Medigap: Predictable costs and broad provider choice
Original Medicare (Parts A and B) is run by the federal government and covers hospital stays, doctor visits, and outpatient care. You can see any doctor or hospital in the United States that accepts Medicare. However, you pay a deductible before coverage kicks in, and you share the cost of care with Medicare through coinsurance — typically 20 percent of the bill after the deductible.
Many seniors add a Medigap policy (also called supplemental insurance) to cover those deductibles and coinsurance. Medigap is sold by private insurance companies and comes in ten standardized plans, labeled A through N. Plan G and Plan N are the most common choices today. You pay a monthly premium for Medigap, but once you meet your deductible, your out-of-pocket costs are predictable. The trade-off is that Medigap premiums can rise each year, and you must purchase Part D separately if you want prescription drug coverage.
This route works well if you have established relationships with specific doctors, see specialists regularly, or travel frequently and want to use healthcare providers anywhere in the country.
Medicare Advantage: Lower monthly premiums, network restrictions
Medicare Advantage (Part C) is an alternative to Original Medicare, offered by private insurance companies under contract with Medicare. These plans bundle hospital, medical, and usually prescription drug coverage into one monthly premium — often $0. In exchange, you must use doctors and hospitals in the plan's network, except in emergencies. Most Medicare Advantage plans also include dental, vision, and hearing benefits that Original Medicare does not cover.
The catch is that you typically pay a copay or coinsurance each time you see a doctor or fill a prescription, and you may face an annual out-of-pocket maximum — the most you will pay in a year before the plan covers everything at no cost. If you need care outside the network, you usually pay the full cost unless the plan approves it in advance.
Medicare Advantage works well if you are willing to use a specific network of doctors, prefer lower monthly premiums, want dental or vision coverage included, and do not travel outside your plan's service area often. It is also a good fit if you take multiple medications, because prescription drugs are usually included.
Prescription drug coverage: A separate choice you must make
If you choose Original Medicare with Medigap, you must also choose Part D (prescription drug coverage) from a private insurance company. Part D plans vary widely in which drugs they cover, what you pay for each drug, and what the monthly premium is. You can use a tool on Medicare.gov to compare plans based on the specific medications you take.
If you choose Medicare Advantage, prescription drug coverage is usually included in the plan, so you do not need to buy Part D separately. However, you should still check whether your medications are on the plan's formulary (the list of covered drugs) and what you will pay for each one.
If you do not sign up for Part D when you first become may be able to access, and you go without drug coverage for more than 63 days, you will owe a penalty for as long as you have Medicare. The penalty is added to your Part D premium each month.
Comparing costs: Monthly premiums, deductibles, and out-of-pocket limits
The true cost of a plan is not just the monthly premium. You also need to know the deductible (the amount you pay before coverage starts), the copay or coinsurance (what you pay each time you use care), and the out-of-pocket maximum (the most you will pay in a year).
| Plan Type | Monthly Premium | Deductible | Copay/Coinsurance | Out-of-Pocket Max |
|---|---|---|---|---|
| Original Medicare + Medigap | Varies by Medigap plan; often $100–$300+ | $240 (Part A), $226 (Part B) in 2024 | Covered by Medigap after deductible | Varies by Medigap plan |
| Medicare Advantage | Often $0–$50 | Varies; often $0–$500 | Usually $10–$50 per visit | Set by law; $8,850 in 2024 |
| Part D (Prescription Drugs) | Varies; often $5–$100 | Varies; often $0–$505 | Varies by tier; often $5–$100 per drug | Varies by plan |
To find the true cost of a plan, use the Medicare Plan Finder tool on Medicare.gov. Enter your medications, doctors, and hospitals, and the tool will show you the estimated total cost for each plan in your area for the coming year. This is the most reliable way to compare.
How to choose: Questions to ask yourself
Start by listing the doctors and hospitals you use most often. Call each plan you are considering and ask whether your doctors are in the network. If your primary care doctor is not in a plan's network, that plan is usually not a good fit.
Next, list all the medications you take. Use the Medicare Plan Finder to see what each plan charges for those specific drugs. A plan with a low monthly premium might charge more for your medications, making it more expensive overall.
Then consider how often you use healthcare. If you see many specialists or expect to have surgery or hospitalization, Original Medicare with Medigap may give you more predictable costs and broader access. If you are relatively healthy and want to minimize monthly premiums, Medicare Advantage may be cheaper.
Finally, think about travel. If you spend winters in another state or travel frequently, Original Medicare works anywhere in the country. Medicare Advantage typically only works in your plan's service area.
When and how to enroll or change plans
If you are turning 65, you have a seven-month Initial Enrollment Period centered on your birthday month. If you miss this window, you may pay a permanent penalty on your premiums.
If you already have Medicare, you can change plans once a year during the Annual Enrollment Period, which runs from October 15 to December 7. Changes take effect January 1. You can enroll through Medicare.gov, by phone at 1-800-MEDICARE, or with the help of a State Health Insurance information Program (SHIP) counselor, who offers free guidance.
If you experience a may have access to life event — such as moving, losing employer coverage, or a major change in income — you may be able to change plans outside the enrollment period. Contact Medicare to ask whether your situation qualifies.
Common mistakes to avoid
Do not assume the cheapest plan is the best deal. A plan with a $0 premium might charge $50 per doctor visit, which adds up quickly if you see doctors often.
Do not skip Part D if you choose Original Medicare. The penalty for going without drug coverage is permanent and compounds each year.
Do not ignore network restrictions with Medicare Advantage. If your doctor is not in the network, you will pay out of pocket unless the plan approves an exception.
Do not wait until after December 7 to make a change. If you miss the Annual Enrollment Period, you are locked into your current plan for the rest of the year, with limited exceptions.
Frequently Asked Questions
Can I switch from Original Medicare to Medicare Advantage, or vice versa?
Yes. You can change plans during the Annual Enrollment Period (October 15 to December 7) each year. If you switch from Original Medicare to Medicare Advantage, you do not need Medigap anymore. If you switch from Medicare Advantage to Original Medicare, you should enroll in Medigap and Part D at the same time, or you may pay higher premiums later.
What happens if I do not choose a Part D plan?
If you have Original Medicare and do not sign up for Part D when you first become may be able to access, you will owe a late enrollment penalty for as long as you have Medicare. The penalty is about 1 percent of the national average Part D premium for each month you were without coverage. This penalty is added to your Part D premium every month.
Do I have to use my plan's doctors and hospitals?
It depends on your plan. With Original Medicare, you can see any doctor or hospital that accepts Medicare. With Medicare Advantage, you must use in-network providers except in emergencies, unless the plan approves an out-of-network visit in advance. Check your plan's provider directory before you enroll.
What if my doctor leaves my Medicare Advantage plan?
If your doctor leaves the plan's network, you have the right to request an exception to continue seeing them out of network, usually at in-network rates. You can also change to a different plan outside the Annual Enrollment Period if your doctor is no longer available. Contact your plan to ask about your options.
How do I know if a plan covers my medications?
Use the Medicare Plan Finder tool on Medicare.gov. Enter each medication you take, and the tool will show you which plans cover it, what tier it is on, and what you will pay. You can also call the plan directly and ask a pharmacist whether a specific drug is covered.