How to Read a Medicare Summary Notice: The Names First, the Capped Amount, and the Line to Question

If you have Original Medicare — Part A for hospital care, Part B for doctors and outpatient care — an envelope arrives with Medicare Summary Notice at the top and, in capital letters, THIS IS NOT A BILL. Believe it. It is a statement of every claim providers sent to Medicare about you, and checking it takes about five minutes: the names first, then one column, then any line marked NO.

Exhibit A: What it is, and when it comes

The Medicare Summary Notice (MSN) is the claims statement for Original Medicare. Medicare.gov says one comes every 6 months if you got any services or medical supplies in that period, and none in a period with no claims. Faster: the electronic version emails you any month a claim is processed, and your Medicare account at Medicare.gov shows claims soon after processing.

If you have a Medicare Advantage plan instead, you will not get an MSN; the plan sends its own statement, an Explanation of Benefits (EOB).

One rule above all: never pay from the MSN. The bill comes from the provider; the MSN is what you check it against.

Exhibit B: The names first

The first page is a dashboard. Under "Providers with Claims This Period" it lists each date of service and each provider who billed Medicare. The notice's own checklist starts here: do you recognize each doctor or provider? Did you have an appointment that day? Did you get the services listed?

So start with your calendar, not the numbers. A name you don't recognize is sometimes innocent — a practice's billing name, or the lab your sample went to. Call the phone number printed next to the provider and ask.

A claim for a date you had no visit, or a service you never got, is something else. Medicare asks you to report it: call 1-800-MEDICARE (1-800-633-4227). Billing for services never given is an example of fraud the notice itself names.

Exhibit C: One column decides what you can owe

The claims page has four money columns; only one is about your wallet:

1. Amount Provider Charged — the provider's own price. Ignore it.
2. Medicare-Approved Amount — what Medicare allows for that service.
3. Amount Medicare Paid — Medicare's share of the approved amount.
4. Maximum You May Be Billed — printed in bold, and the only number that limits you. The notice defines it as "the total amount the provider is allowed to bill you," including your deductible (what you pay each year before Medicare pays) and coinsurance (your percentage share of the approved amount).

Even if a provider has not agreed to take Medicare's approved amount as full payment, what it may add on top is a capped amount, already baked into the number in that column.

When the provider's bill arrives, lay it next to the notice. A bill higher than "Maximum You May Be Billed" for that claim is worth questioning before you pay a dollar of it. If you have a Medicare Supplement (Medigap) policy or other insurance, it may pay part or all of that maximum.

Exhibit D: The line to question

Now the column called "Service Approved?" A NO means Medicare denied that line, and the letter next to it points to a note explaining why. A denial is often a paperwork problem, so take it in order:

1. Call the provider first. Ask whether they sent the right information; if not, the provider can correct and resubmit the claim. Ask for an itemized statement too — every charge with its code and date.
2. If you still disagree, appeal in writing. The first appeal is called a redetermination, and the regulation gives the deadline: a request "must be filed within 120 calendar days from the date a party receives the notice of the initial determination," and receipt is "presumed to be 5 calendar days after the date of the notice" unless shown otherwise (42 C.F.R. § 405.942(a)). Your notice does the math — the last page prints the date in a box labeled "We must receive your appeal by." Circle the service, write why you disagree, and mail it to the printed address.
3. Free help exists. Your State Health Insurance Assistance Program (SHIP) offers free counseling on appeals; its number is on page 2 of the notice.

Your Move

1. Check the names and dates against your calendar before the numbers.
2. Match each provider bill to its claim on the notice. A bill above "Maximum You May Be Billed" is worth questioning, in writing, before you pay.
3. For any line marked NO, call the provider, ask for an itemized statement, and ask them to resubmit if the information was wrong.
4. Appeal by the printed date if the denial stands — the steps are on the notice's last page.

If your coverage is a regular insurance plan, the same check works on its statement — how to read an EOB.

Upload your bill and BillFighter shows which letter fits your situation, and what to do next. Check my bill, free → — the analysis is free. Personalized letters need the Fight Kit or In Your Corner.

Citations are to 42 C.F.R. § 405.942 and to the Medicare Summary Notice form published by CMS and Medicare.gov (2026). BillFighter helps you understand and fight medical bills. We're a tool, not a law firm, and this isn't legal advice.