How Medicare Payments Work and Where Your Money Goes

Medicare takes money from your paycheck and uses it to pay doctors, hospitals, and other providers

Medicare is funded through payroll taxes — money taken directly from your wages while you work. When you turn 65 or become may be able to access earlier due to disability or end-stage renal disease, Medicare uses that pool of money to pay your medical bills. You do not pay Medicare directly for each visit or test. Instead, Medicare collects taxes from workers and employers throughout your career, holds that money in trust funds, and then pays providers on your behalf when you use care.

The system has four parts, and each one is funded differently. Part A (hospital insurance) and Part B (medical insurance) come from payroll taxes and general tax revenue. Part D (prescription drug coverage) is funded through premiums you pay monthly. Part C (Medicare Advantage) is an alternative to Parts A and B, offered by private insurance companies that receive a fixed payment from Medicare for each person enrolled.

When you receive care, the provider bills Medicare, not you. Medicare then pays the provider a set amount — called the allowed amount — based on a fee schedule. You may owe a portion of that cost, depending on your coverage and the type of care.

Key Takeaways

• Medicare is funded by payroll taxes collected while you work, not by premiums you pay after age 65.
• When you use care, the provider bills Medicare directly, and Medicare pays them a set fee based on government schedules.
• You may owe a deductible, copay, or coinsurance depending on which part of Medicare you use and what type of care you receive.
• Part A and Part B are standard Medicare; Part C is a private alternative; Part D covers prescriptions and requires a separate monthly premium.
• If your income is low, you may may have access to for programs that help pay your Medicare costs, such as Medicaid or the Medicare Savings Program.

What comes out of your paycheck to fund Medicare

While you work, your employer and you each pay 1.45% of your wages into Medicare Part A (hospital insurance). If you are self-employed, you pay 2.9% total. There is no income cap on this tax — it applies to all your earnings, no matter how much you make. This money goes into the Hospital Insurance Trust Fund, which pays for inpatient hospital stays, skilled nursing facility care, hospice, and some home health services.

Part B (medical insurance) is funded differently. It comes from general federal tax revenue and from premiums that people over 65 pay each month. In 2024, the standard Part B premium is $164.90 per month, though the amount changes yearly and may be higher if your income exceeds certain thresholds. Part B covers doctor visits, outpatient care, lab tests, and durable medical equipment.

You do not pay a separate payroll tax for Part B while you work. Instead, Part B is funded through income taxes collected from all taxpayers, plus the monthly premiums from people using Medicare. This is why Part B premiums can increase year to year — they adjust based on how much care Medicare beneficiaries use and how much providers charge.

How Medicare pays providers and what you owe

When you see a doctor or go to a hospital, the provider submits a bill to Medicare. Medicare does not pay the full amount the provider charges. Instead, it pays based on a fee schedule — a list of allowed amounts set by the Centers for Medicare & Medicaid Services (CMS). The allowed amount varies by service, location, and provider type. For example, an office visit in rural Montana may have a different allowed amount than the same visit in New York City.

Once Medicare decides what it will pay, you may owe money out of pocket. The amount depends on which part of Medicare you are using and what type of care:

• Part A deductible: In 2024, you pay $1,632 per hospital stay. After you meet this deductible, Medicare covers the full cost of the first 60 days of hospitalization.
• Part B deductible: In 2024, you pay $240 per year. After you meet it, you typically pay 20% of the allowed amount for doctor visits and outpatient services.
• Copays and coinsurance: For some services like lab tests or X-rays, you may pay a flat copay (for example, $0 to $50). For others, you pay coinsurance — a percentage of the allowed amount.
• Part D premiums: Prescription drug plans charge a monthly premium that varies by plan, typically $5 to $100 per month. You also pay a deductible, copays, and coinsurance when you fill prescriptions.

Deductibles and premiums change each year. Medicare publishes the new amounts in October for the following year, and they take effect January 1.

When Medicare pays less than the provider charges

Providers are not required to accept Medicare's allowed amount as payment in full. Some doctors and hospitals are in-network — they have agreed to accept Medicare's payment plus your coinsurance as full payment and will not bill you for the difference. Other providers are out-of-network — they can charge you more than Medicare's allowed amount, and you may owe the difference, called balance billing.

Most doctors and hospitals do accept Medicare and agree not to balance bill. You can check whether a provider accepts Medicare by calling their office or searching the Medicare provider directory at Medicare.gov. If a provider does not accept Medicare, they must tell you in writing before you receive care, and you can choose to go elsewhere.

If you are in a Medicare Advantage plan (Part C), the rules are different. Your plan sets its own network of providers and its own copays and coinsurance. You must use in-network providers to receive the plan's covered benefits, or you may pay more or receive no coverage at all.

How to pay your Medicare premiums and deductibles

If you receive Social Security, your Part B premium is usually deducted automatically from your monthly benefit. You see the amount on your Social Security statement each month. If you do not receive Social Security, Medicare sends you a bill quarterly or monthly, depending on your situation.

Part D premiums are paid directly to your prescription drug plan, usually by automatic bank transfer or check. You choose your plan during the annual enrollment period (October 15 to December 7 each year), and your coverage begins January 1.

Deductibles and coinsurance are paid to the provider at the time of service or billed to you afterward. If you cannot pay, talk to the provider's billing department — many have payment plans or financial counselors who can help. Some providers also offer discounts for uninsured or low-income patients, though this is separate from Medicare.

Programs that help pay your Medicare costs

If your income is low, you may may have access to for Medicaid, which can pay your Part B premiums, deductibles, and coinsurance. Medicaid is run by your state, so may be able to access and benefits vary. You apply through your state's Medicaid office or social services department.

The Medicare Savings Program is another option. It pays Part B premiums and some deductibles and coinsurance for people with limited income and resources. Income limits vary by state, but generally you must earn less than $1,500 to $1,900 per month (as a single person) to may have access to. You apply through your state's Medicaid office.

The Low-Income Subsidy Program helps pay Part D premiums and out-of-pocket costs for prescription drugs. If your income is below 150% of the federal poverty level, you may may have access to. You can apply online at Medicare.gov or by calling 1-800-MEDICARE.

Your state's State Health Insurance Assistance Program (SHIP) offers free counseling about Medicare costs and coverage options. You can find your local SHIP by calling 1-800-MEDICARE or visiting shiptalk.org.

What happens if you do not pay your Medicare costs

If you do not pay your Part B premium, Medicare will drop your coverage after a grace period. You can re-enroll during the General Enrollment Period (January 1 to March 31 each year), but you may face a permanent penalty — your premium will be 10% higher for each year you were not enrolled. This penalty stays with you for life.

If you do not pay deductibles or coinsurance owed to a provider, the provider can bill you repeatedly or send your debt to a collection agency. This can damage your credit. However, providers must give you a chance to pay and cannot refuse to treat you in an emergency because of unpaid bills.

If you cannot pay, contact the provider's billing department or financial counselor before the debt goes to collections. Many providers will work with you on a payment plan or reduce your bill if you have low income.

Frequently Asked Questions

Do I have to pay for Medicare while I am still working?

Yes. You pay the Medicare payroll tax (1.45% of your wages) while you work, regardless of your age. This money funds the system for current beneficiaries and builds your own Medicare may be able to access. Once you turn 65 or become may be able to access due to disability, you can enroll in Medicare and begin using these benefits.

What is the difference between Medicare and Medicaid?

Medicare is a federal program for people 65 and older (or younger people with disabilities or end-stage renal disease). Medicaid is a joint federal-state program for low-income individuals of any age. Medicare is based on work history; Medicaid is based on income. Some people may have access to for both, called "dual may be able to access."

Can I use Medicare outside the United States?

Medicare generally does not cover care received outside the U.S., except in limited situations near the border (Canada and Mexico) or on a cruise ship within U.S. territorial waters. If you travel internationally, consider supplemental travel insurance. Some Medicare Advantage plans offer limited overseas coverage; check your plan's details.

What if I disagree with what Medicare paid for a service?

You can file an appeal. The process depends on which part of Medicare you used and who is appealing — you, the provider, or both. You have 120 days from the date on the Medicare notice to request an appeal. Call 1-800-MEDICARE or visit Medicare.gov for instructions specific to your situation.

Do I need to enroll in Part D if I do not take prescription drugs?

If you do not enroll in Part D when you first become may be able to access, you may face a permanent penalty if you enroll later. The penalty is about 1% of the national average Part D premium for each month you were not enrolled. If you are certain you will never need prescriptions, you can decline, but most people enroll to avoid the penalty.