What a Medicare premium bill means

A Medicare premium bill arrives when you owe money for your coverage — either because you did not pay when you first enrolled, because your income changed and you now owe more, or because you chose a plan that requires monthly payments. Medicare sends these bills to your home address on file, usually monthly. The bill shows which part of Medicare you are paying for (Part B, Part D, or both), the amount due, and the important date.

The most common reason for a surprise bill is a change in your income. If your income rose in the past two years, Medicare may have increased your premium under a rule called Income-Related Monthly Adjustment Amount (IRMAA). This means higher earners pay more for Part B and Part D coverage. Another reason is that you did not enroll in Part B when you first became may be able to access at 65, which adds a permanent penalty to your premium for as long as you have Medicare.

Key Takeaways

  • Medicare premium bills are sent to your home address and show which part of coverage you owe for, the amount, and the payment important date.
  • Income changes in the past two years can trigger higher premiums through IRMAA, which applies to Part B and Part D coverage.
  • Delayed enrollment in Part B at age 65 adds a permanent penalty to your premium unless you have may have access to coverage from an employer.
  • You can request a review of your premium if your income dropped or if Medicare used outdated income information.
  • Paying by the important date shown on your bill prevents your coverage from being suspended.

Income changes that trigger higher premiums

If your income was higher in 2022 or 2023, your 2024 or 2025 Medicare premium may be higher than you expected. Medicare uses your tax return from two years prior to set your premium. For example, if you had a large one-time gain — from selling a home, a pension payout, or withdrawing from a retirement account — that income counts even if it will not happen again.

IRMAA applies in income brackets. If your modified adjusted gross income (MAGI) exceeds a certain threshold, you pay a surcharge on top of the standard Part B and Part D premiums. The thresholds and surcharge amounts change each year. A single person with MAGI over roughly $97,000 in 2023 would see an increase on their 2025 premium, though the exact amount depends on how far over the threshold you are.

If your income dropped since then — you retired, took a lower-paying job, or had a major loss — you can request that Medicare recalculate your premium using current income. This is called a Life-Changing Event appeal. You will need to show proof of the change, such as a recent pay stub, a letter from your employer, or a tax return.

Late enrollment penalties for Part B

If you did not enroll in Part B when you turned 65, or within three months after, you may owe a permanent penalty. The penalty is 10 percent of the standard Part B premium for each full year you were not enrolled. If you waited five years to enroll, your premium is 50 percent higher than the standard rate, and that increase stays with you for life.

The penalty does not explore if you had creditable coverage — health insurance through a current employer or a spouse's employer — during the time you were not enrolled in Part B. If you have creditable coverage and enroll within eight months of losing that job or coverage, you avoid the penalty. You will need to show proof of that coverage when you enroll.

If you enrolled late and are now seeing the penalty on your bill, you cannot remove it retroactively. However, if you believe you had creditable coverage and Medicare did not account for it, you can contact Social Security to request a review.

Part D late enrollment penalties

Part D is prescription drug coverage. If you did not enroll when you first became may be able to access, or if you had a gap in coverage of 63 days or more, you owe a late enrollment penalty on your Part D premium. Like Part B, this penalty is permanent and calculated based on how long you went without coverage.

The penalty does not explore if you had creditable prescription drug coverage through a former employer, a union, or a retiree health plan during the time you were not enrolled in Part D. If you have that proof, you can show it to Medicare to avoid or remove the penalty.

How to read your Medicare premium bill

Your bill shows the coverage type, the monthly premium amount, any IRMAA surcharge, the total due, and the payment important date. It also lists the address where you should send payment or instructions for paying online. Check that the bill is addressed to you and that the coverage dates are correct.

If the amount seems wrong, compare it to your previous bill. A significant jump usually signals an income change, a plan change, or a penalty you were not aware of. If you cannot find a reason for the increase, call Medicare at 1-800-MEDICARE (1-800-633-4227) and ask them to explain the charges on your bill.

How to pay your Medicare premium

You can pay by mail, phone, or online through your Medicare account. If you pay by mail, send a check or money order to the address on your bill at least one week before the due date. If you pay by phone, call 1-800-MEDICARE and have your bill handy. Online payment is fastest — log into your Medicare account at Medicare.gov, go to "Billing and Payments," and follow the prompts.

If you miss the important date, your coverage may be suspended. Once you pay, it usually takes 7 to 10 business days for the payment to post. If you are having trouble paying, ask about a payment plan. Medicare may allow you to spread the amount over several months instead of paying it all at once.

Requesting a review if your income changed

If your income dropped since Medicare calculated your premium, you can request a review. This is called an IRMAA appeal or a Life-Changing Event appeal. You will need to show proof of the income change — a recent tax return, a letter from your employer saying you were laid off, a divorce decree, or a death certificate if you lost a spouse's income.

To file an appeal, contact Social Security at 1-800-772-1213 (TTY 1-800-325-0778) or visit your local Social Security office. You have until September 30 of the year after the year Medicare used to calculate your premium. For example, if Medicare used your 2023 income to set your 2025 premium, you have until September 30, 2025 to appeal.

If your appeal is approved, Medicare will recalculate your premium and may refund the overpayment. The refund can take several weeks to process.

Frequently Asked Questions

What happens if I do not pay my Medicare premium bill?

If you do not pay by the important date, your Medicare coverage will be suspended. You will not be covered for doctor visits, hospital stays, or prescription drugs until you pay. Once you pay, coverage usually resumes within a few days, but any care you received while uninsured is your responsibility.

Can I dispute the amount on my bill?

Yes. If you believe the amount is wrong, call Medicare at 1-800-MEDICARE and ask them to review the charges. Have your bill in front of you and be ready to explain why you think the amount is incorrect. They can tell you whether the charge is due to an income change, a plan change, or an error.

Why does my bill show a surcharge I did not expect?

The surcharge is likely an IRMAA increase based on your income from two years ago. If your income has since dropped, you can request an appeal by contacting Social Security. You will need to show proof of the income change.

Can I change my Medicare plan to lower my premium?

Yes, during the Annual Enrollment Period (October 15 to December 7 each year), you can switch to a different Part B plan or Part D plan. Comparing plans may show a lower-cost option that covers your doctors and drugs. You can compare plans at Medicare.gov or call 1-800-MEDICARE for help.

What if I cannot afford to pay my premium?

If you have limited income, you may be able to get help paying your premiums through Medicaid or a Medicare Savings Program. These programs vary by state. Contact your state Medicaid office or call 1-800-MEDICARE to learn what programs may be available in your area.