Reading Your Medicare Summary Notice: Spot Errors, File Appeals

Your Medicare Summary Notice (MSN) is a statement from Medicare detailing all services and supplies billed to Original Medicare. It shows what Medicare paid and what you might owe, and it is crucial to review it for errors within 120 days to dispute any incorrect charges or services you did not receive.

Key takeaways

• Your Medicare Summary Notice (MSN) lists all healthcare services billed to your Original Medicare.
• Review your MSN carefully for services you did not get or incorrect billing details.
• You have 120 days from the date on your MSN to file an appeal if you disagree with a Medicare decision.
• If you have a Medicare Advantage plan, you will receive an Explanation of Benefits (EOB) from your plan, not an MSN from Medicare.
• You can view your MSNs online anytime through your MyMedicare.gov account.

What is a Medicare Summary Notice?

A Medicare Summary Notice (MSN) is not a bill. It is a statement that Original Medicare sends to you every three months if you received services during that period. This notice details all healthcare services, supplies, and prescription drugs (if covered under Part B) that providers billed to Medicare on your behalf. This includes inpatient and outpatient hospital services, doctor visits, lab tests, and durable medical equipment.

Each MSN shows the date of service, the service provider, the amount charged by the provider, what Medicare approved to pay, and what you may owe. It helps you keep track of your healthcare spending and identify any potential billing mistakes. Reviewing this document helps you understand your benefits, track your use of services, and verify that all charges are legitimate.

Why should you review your MSN?

Reviewing your MSN is important for several reasons. It allows you to confirm that you received all the services listed. It also helps you understand how much Medicare paid and what your financial responsibility might be, including any deductibles, copayments, or coinsurance amounts you owe.

Catching errors early can prevent you from paying for services you never received. It also helps protect you from potential Medicare fraud. Providers can make honest mistakes, but sometimes, incorrect billing can be a sign of fraudulent activity. Your careful review acts as an important safeguard against overpayment and helps ensure your medical records accurately reflect the care you received.

How to spot errors on your MSN?

When you receive your MSN, check each item line by line. Compare the dates of service with your personal records or calendar. Make sure the services listed match what you actually received from your doctors, hospitals, or other providers.

Look for services you did not get, duplicate charges for the same service, or services provided by a doctor you did not see. Pay close attention to the service descriptions; an incorrect service code or an unfamiliar procedure listed could be an error. If a description seems unclear or unfamiliar, it might be worth investigating further.

For example, if your MSN shows a charge for a doctor's visit on a day you know you were not at the clinic, that is an error. Similarly, if you see a charge for a specific medical test that you never had, or if a listed quantity for a supply seems too high, you should question it. These discrepancies are often simple clerical errors, but they need correction.

What is the 120-day appeal window?

If you find an error or disagree with a decision Medicare made about a service, you have a limited time to act. The 120-day appeal window begins on the date printed on your Medicare Summary Notice, not the date you receive it. This means you have about four months to formally challenge Medicare's decision, whether it's a denial of coverage or the amount paid for a service.

It is important to start the process as soon as possible after receiving your MSN. Gathering information and making phone calls can take time. Missing this deadline could mean you lose your right to appeal that specific charge or decision, and you may become responsible for the full cost of the service.

If you believe Medicare should have paid more for a service, or if you were denied coverage for something you think is medically necessary, the 120-day window applies. This timeframe gives you the opportunity to explain why you think the decision should be changed.

How do you appeal a Medicare decision?

The appeal process has several steps. First, if you spot an error, contact the healthcare provider or supplier directly. Often, billing mistakes can be resolved quickly at this stage. Ask them to check their records and resubmit the claim to Medicare if an error is found.

If contacting the provider does not resolve the issue, or if you disagree with Medicare's coverage decision, you can file a formal appeal. The instructions for appealing are included on your MSN. You will need to fill out a form, often called a “Medicare Redetermination Request Form.”

Send your completed form and any supporting documents, like doctor's notes, medical records, test results, or your own detailed records, to the Medicare contractor listed on your MSN. Make sure to keep copies of everything you send. Medicare will review your appeal and send you a decision letter. If you are not satisfied with the first decision, there are further levels of appeal, including reconsideration by a Qualified Independent Contractor and a hearing by an Administrative Law Judge.

What about Medicare Advantage plans?

If you have a Medicare Advantage plan (Medicare Part C), you will not receive a Medicare Summary Notice from Original Medicare. Instead, your Medicare Advantage plan will send you a similar document called an Explanation of Benefits (EOB). The EOB comes directly from your private insurance plan.

Like an MSN, an EOB shows what services you received, what the provider billed, what your plan paid, and what you might owe. EOBs may be sent monthly or after each service, depending on your plan's policy. You should review your EOB just as carefully as someone with Original Medicare reviews their MSN. The process for disputing charges or appealing decisions will be handled through your specific Medicare Advantage plan.

Each Medicare Advantage plan has its own procedures for appeals (for coverage denials) and grievances (for concerns about quality of care or service issues). You will find the details on how to appeal a decision within your plan's EOB or by contacting your plan directly. Always refer to your plan's specific documents or customer service for guidance on their appeals process.

MSN vs. EOB: Key Differences

While both the Medicare Summary Notice (MSN) and the Explanation of Benefits (EOB) serve similar purposes, they come from different sources and apply to different types of Medicare coverage. Understanding this distinction is key to knowing where to direct your questions or appeals.

This table highlights that your type of Medicare coverage determines which statement you receive and who handles any issues you find. The appeals process for an MSN follows federal Medicare rules, while an EOB appeal follows the rules of your private Medicare Advantage plan, which can have different timelines and forms. For more about coverage options, see Medicare Parts A, B, C, D: What Each Covers & Your Choices. If you are weighing your options, you can read more about Original Medicare vs. Medicare Advantage: Which Is Right For You?.

Accessing your MSNs online

Medicare provides a convenient way to view your Medicare Summary Notices online at any time. You can create an account or log in to MyMedicare.gov. Once logged in, you can access your MSNs digitally, often much sooner than the paper version arrives in the mail.

Viewing your MSNs online allows you to track your claims and payments throughout the year, often faster than waiting for the mail. You can also check the status of a claim in real-time. It can also help you quickly spot any unusual activity or charges. This online portal provides a clear overview of your Medicare benefits usage.

MyMedicare.gov also offers other helpful features, such as tracking your deductible status, reviewing your personal information, and finding information about preventive services covered by Medicare. It's a useful tool for managing your Medicare information and staying informed about your benefits. If you're wondering about common coverage, explore What Medicare Part B Covers: Doctor Visits and More.

What if you miss the 120-day deadline?

Missing the 120-day deadline for appealing a Medicare decision can make it difficult to resolve the issue. Generally, Medicare will not reconsider a decision once this timeframe has passed. This is why it is so important to review your MSNs promptly.

In very limited circumstances, Medicare might accept a late appeal if you can show you had a good reason for the delay. This might include serious illness, a natural disaster, or the death of a close family member. However, these exceptions are rare and require strong documentation and a compelling explanation for the delay.

It is always advisable to act within the given timeframe. If you are close to the deadline and need help, contact your State Health Insurance Assistance Program (SHIP) for free, unbiased counseling. They can offer guidance on navigating the appeal process, even if you are close to the deadline or have missed it.

How does fraud affect your MSN?

Medicare fraud involves someone intentionally deceiving Medicare to receive payment for services that were not provided or were medically unnecessary. Your MSN can be an early warning sign of fraud. If you see services or supplies listed that you never received, it could indicate fraud.

Examples of potential fraud include charges for medical equipment you did not order or receive, services billed under a doctor you do not know, or multiple charges for a single service. Other forms of fraud include 'upcoding' (billing for a more complex or expensive service than was actually provided) or 'unbundling' (billing separately for services that should be part of one procedure). Your vigilance in reviewing your MSN helps protect both yourself and the Medicare program from waste and abuse, helping to keep Medicare financially sound for all beneficiaries.

If you suspect fraud, report it immediately. You can contact Medicare directly at 1-800-MEDICARE (1-800-633-4227) or your local Senior Medicare Patrol (SMP). They can investigate your concerns and guide you on what steps to take next. Reporting fraud helps keep Medicare strong for everyone.

Common reasons for MSN errors

Errors on your Medicare Summary Notice are not always due to fraud. Often, they result from simple administrative mistakes. A provider's billing office might make a data entry error, like typing the wrong service code (CPT code), the wrong date, or omitting a necessary modifier. Incorrect patient identification numbers can also lead to claims being filed under the wrong person.

Sometimes, claims can be mistakenly filed under the wrong patient's name. Communication issues between different medical departments or a mix-up in medical records can also lead to inaccuracies. These are typically honest mistakes that can be corrected once identified. Providers also have an interest in correcting errors to ensure they receive proper payment for their services.

Regardless of the reason, it is your responsibility to review your MSN and report any discrepancies. Even small errors can lead to incorrect payments or affect your deductible tracking. A quick call to the provider can often clear up these common billing issues efficiently.

Keep good records for your health care

Maintaining good personal records of your healthcare visits is very helpful for reviewing your MSN. Keep a simple log of your doctor appointments, hospital stays, medical tests, and any supplies you receive. Note the date, the provider's name, the service performed, and any referrals or prescriptions you received.

When your MSN arrives, you can easily compare it against your own records. This makes it much simpler to spot any discrepancies quickly and accurately. Good record-keeping also helps you track your overall health journey, monitor costs, and communicate effectively with your doctors and family members.

These records can be as simple as a notebook or a file on your computer. Having this information readily available will make the process of checking your MSN much more straightforward and give you confidence in your review. It can also provide crucial evidence if you need to appeal a decision. Keep copies of any letters or forms you send to Medicare or your providers.

Have questions? Call 1-877-443-3251 to talk it through with a licensed insurance agent. You never pay the agent; the plans they represent do, and the decision stays yours.

We do not offer every plan available in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options. Medicare has neither reviewed nor endorsed this information.