Medicare & Insurance

How to Read Your Medicare Summary Notice and Spot Mistakes

By Jo Brennan / November 9, 2026

If you have Original Medicare, you receive a paper called the Medicare Summary Notice. It lists the care and supplies that doctors and other providers billed to Medicare for you, and what Medicare paid. It is not a bill, so you do not pay anything to Medicare because of it. Its real value is as a checking tool: reading it takes a few minutes and can show you a service you never received, a charge listed twice, or a wrong date. This guide explains each part in plain words, what to look for, and who to call if something looks wrong.

Key takeaways

The Medicare Summary Notice (often shortened to MSN) is a record of claims, not a bill.
Compare it with your own receipts, appointment calendar and bills.
You can also see your claims online with a free Medicare.gov account, usually within a day of Medicare processing them.
If something looks wrong, call the provider’s office first. If that does not settle it, call 1-800-MEDICARE.
Medicare Advantage plans and Part D drug plans send a different paper, called an Explanation of Benefits.

What the notice is, and what it is not

Original Medicare is the government plan made up of Part A (hospital insurance) and Part B (medical insurance). A “claim” is a request for payment that a doctor, hospital, or supply company sends to Medicare after you receive care.

According to Medicare.gov, the notice lists the Part A and Part B services and supplies that providers billed to Medicare, what Medicare paid, and the most you may owe the provider. The words “may owe” matter. If you also have a Medigap plan (supplemental insurance bought from a private company) or other coverage, it may pay some or all of that amount. Medicare.gov tells you to check whether other insurance covers anything Medicare did not.

A provider’s separate bill is what actually asks you for money. The notice helps you decide whether that bill is right.

How often it comes, and how to see it online

As of November 2026, Medicare.gov says you get a notice every 6 months, but only if you received services or medical supplies during that time. The same page says “at least twice a year.” Older materials from other groups describe a different schedule, so if yours comes at another interval, follow what Medicare tells you.

You do not have to wait for the mail. Medicare.gov says you can create or sign in to a secure Medicare account at medicare.gov/my/claims to see your Part A and Part B claims. They usually appear within 24 hours after Medicare processes them. To get your notice electronically, sign in at medicare.gov/my/eMSN. If you choose electronic notices, Medicare sends you a message with a link for any month you have a processed claim. Large print and Braille copies are also available.

If you move, tell Social Security. If you receive benefits from the Railroad Retirement Board, tell that agency instead. Medicare.gov gives those as the places to change your address.

The parts of the notice

The layout has changed over the years and may change again, so use Medicare.gov’s “Download a sample” link to see a current example beside your own. The table below describes the kinds of information the notice carries, based on Medicare.gov, AARP and CMS pages.

Part of the notice	What it means	What to check
Dates of service	The day you were seen or received the item	Does each date match your calendar or receipts?
Provider and service	Who billed Medicare and for what	Do you recognize the provider and the service?
Approved or denied	Whether Medicare accepted the claim	If denied, ask the provider’s office to check what it sent
Amount Medicare paid	Medicare’s share of the claim	Compare it to any bill you receive
Most you may owe the provider	The ceiling on what the provider can ask you for	Does it match what you paid or were billed?
Deductible progress (Part B)	How much of your yearly deductible you have paid	Does it look reasonable for the year?
Messages	CMS says messages on the notice explain general and claim-specific points	Read any message beside a claim
Last page	Medicare.gov says it gives step-by-step directions to appeal	Find the appeal deadline printed there

A “deductible” is the amount you pay yourself each year before Medicare starts to pay its share.

What to look for

Medicare.gov and Medicare’s fraud page give the same basic advice: compare the notice against your own records. Keep a small calendar or notebook of appointments and keep the receipts you get. Then read the notice with these questions in mind.

Services you did not receive. Medicare asks you to confirm you received everything listed, and that Medicare was not billed for health care or supplies you did not get.
The same service listed twice. Look for matching dates and items from the same provider.
Wrong dates or providers. A date when you were away, or a doctor you have never seen, deserves a question.
Supplies you never ordered. Equipment or supplies you did not request should be questioned.
Amounts that do not match. If you paid a provider before the notice arrived, check that you paid the correct amount.

Most differences turn out to be honest office mistakes, such as a typing error or a wrong code. Do not assume the worst. Do act on it.

If something looks wrong: three steps

Step 1: Call the provider’s office

Medicare.gov says if a charge looks wrong, call the provider’s office. Have the notice and your records in front of you. Ask them to check what they sent to Medicare. For a denied item, the office may be able to correct the information and send it again. Write down the date, the name of the person you spoke with, and what they said.

Step 2: Call 1-800-MEDICARE

If the office cannot fix it, or you think the claim is for something that never happened, call 1-800-MEDICARE (1-800-633-4227). Medicare’s fraud page says to call this number if you suspect fraud. Fraud means someone deliberately billing for care or items that were not provided. Have these ready: your Medicare number, the provider’s name, the date of service, and the date of your notice.

Step 3: Contact your Senior Medicare Patrol

The Senior Medicare Patrol, or SMP, is a national network of volunteers and staff who help people on Medicare spot, avoid and report health care fraud, billing mistakes and abuse. The national website lists a toll-free line at 877-808-2468 and a “Find Help in Your State” button for your local office. Medicare’s fraud page also points to your State Health Insurance Assistance Program, or SHIP, for local Medicare help, with contacts at shiphelp.org.

If Medicare denied something you believe it should cover

You can ask for an appeal, which is a formal request for Medicare to look again. The last page of the notice explains how. The notice sets the deadline, so look for it as soon as you decide to appeal.

Medicare Advantage and Part D: Explanation of Benefits

Some people get their Medicare coverage through a Medicare Advantage Plan (Part C), which is offered by a private company, and some add a Part D prescription drug plan. Medicare.gov says that for Part C and Part D claims you should check the Explanation of Benefits, or EOB, that your plan mails you, and contact your plan for more current claim information.

For Part D, Medicare.gov describes the EOB as a summary of your prescription drug claims and costs, sent by your plan. It arrives monthly, in the months you fill a prescription. Check it for errors, and contact the plan if you have questions, find mistakes, or suspect fraud. Like the Medicare Summary Notice, an EOB is not a bill.

If you have a Medicare Advantage Plan or drug plan and suspect fraud, Medicare gives a special number: 1-877-7SAFERX (1-877-772-3379). You can also call 1-800-MEDICARE.

Frequently asked questions

Do I pay the amount shown on the notice?

No. It is not a bill. Pay only the bills you receive from your providers, and use the notice to confirm those bills are right.

How long should I keep my notices?

AARP suggests keeping them until your providers have sent their bills, and keeping them as tax records for at least three years after the tax-filing deadline if you deduct medical costs. Ask a tax professional about your own situation.

What if I never receive a notice?

Medicare.gov says you get one only if you received services or supplies in the period. If you did and nothing arrives, check your claims in your Medicare account, confirm your address with Social Security, or call 1-800-MEDICARE.

Can someone help me read it?

Yes. Your State Health Insurance Assistance Program and your local Senior Medicare Patrol both help people with Medicare questions and suspected billing problems. Ask each about any cost when you call.

A simple checklist

Keep a calendar of appointments and a folder of receipts.
Read each notice line by line against your calendar.
Look for services you did not receive, duplicates, wrong dates and unfamiliar providers.
Check whether other insurance should pay any part.
Call the provider’s office about anything that does not match.
Call 1-800-MEDICARE if the office cannot solve it or you suspect fraud.
Contact your Senior Medicare Patrol or SHIP for help.
Keep your notices in one safe place.

Before you decide

You do not have to be an expert. Spend ten minutes with each notice and a pen, and ask for help the moment something looks odd. Never give your Medicare number to someone who calls you unexpectedly.

Sources

“Medicare Summary Notice” (MSN), Medicare.gov, U.S. Centers for Medicare & Medicaid Services
Checking the status of a claim, Medicare.gov, U.S. Centers for Medicare & Medicaid Services
Reporting Medicare fraud & abuse, Medicare.gov, U.S. Centers for Medicare & Medicaid Services
Explanation of Benefits (EOB), Medicare.gov, U.S. Centers for Medicare & Medicaid Services
Medicare Summary Notice, U.S. Centers for Medicare & Medicaid Services
Home – Senior Medicare Patrol, SMP Resource Center
What is a Medicare summary notice?, AARP