Is a Medicare Summary Notice a bill?

No. It's a statement of what providers billed to Medicare and what Medicare paid. The bill, if any, comes separately from the provider. Use the MSN's “maximum you may be billed” column to check that bill.

How often does the Medicare Summary Notice come?

People with Original Medicare get one every 4 months if they had services or supplies in that period. They can switch to electronic notices through a Medicare.gov account.

My parent has Medicare Advantage. Why don't they get an MSN?

Medicare Advantage plans send their own Explanation of Benefits (EOB) instead. It works much the same way: it shows what was billed, what the plan paid and what your parent may owe.

What is a Medicare Summary Notice? (And why it says “This is not a bill”)

By the Folkswise team · Updated November 14, 2026 · 5 min read · How we write these guides

If your mom or dad has Original Medicare, a thick envelope from Medicare arrives every few months. It's called a Medicare Summary Notice (MSN). It isn't a bill, but it's the most useful piece of paper you have for catching billing mistakes.

What it is

The MSN lists the services and supplies doctors, hospitals and other providers billed to Medicare for your parent, and what Medicare did with each claim. People with Original Medicare get one every 4 months if they had services in that period. They can also choose to get it electronically through their Medicare.gov account.

If your parent has a Medicare Advantage plan instead, they get an Explanation of Benefits (EOB) from the plan, not an MSN. Drug plans send their own EOB too.

The columns that matter

Amount the provider charged: the list price. It's usually much higher than what's actually paid.
Medicare-approved amount: what Medicare says the service is worth.
Amount Medicare paid: what Medicare sent the provider.
Maximum you may be billed: the most the provider can ask your parent to pay. This is the number to compare with any bill.

What to check, line by line

Did your parent actually get each service, on that date, from that provider?
Is the same service listed twice?
When a bill for that visit arrives, is it asking for more than the “maximum you may be billed”?
If your parent also has Medigap, Medicaid or other coverage, was it billed too? The notice will sometimes say the claim was sent on.

If something looks wrong

Start by calling the provider's billing office with the MSN in hand. Many problems are simple mix-ups. If you disagree with a Medicare decision, such as a denied service, the MSN explains how to appeal and the deadline, which is generally 120 days from when you get the notice. If you think a service was billed that your parent never received, call 1-800-MEDICARE.

Keep each MSN for at least a year. Bills often arrive weeks or months after the visit, and the MSN is how you'll know what's actually owed.

Common questions

Is a Medicare Summary Notice a bill?: No. It's a statement of what providers billed to Medicare and what Medicare paid. The bill, if any, comes separately from the provider. Use the MSN's “maximum you may be billed” column to check that bill.
How often does the Medicare Summary Notice come?: People with Original Medicare get one every 4 months if they had services or supplies in that period. They can switch to electronic notices through a Medicare.gov account.
My parent has Medicare Advantage. Why don't they get an MSN?: Medicare Advantage plans send their own Explanation of Benefits (EOB) instead. It works much the same way: it shows what was billed, what the plan paid and what your parent may owe.

Sources

General information, not medical, legal or insurance advice. Folkswise is an independent service, not affiliated with Medicare or any government agency, and doesn't sell insurance. Rules can change; check with Medicare (1-800-MEDICARE) or your State Health Insurance Assistance Program for your loved one's situation.