MSN= Medicare Summary Notice (MSN)

http://www.medicare.gov/navigation/medicare-basics/understanding-claims/understanding-claims-overview.aspx

If you get a Medicare-covered service, you’ll  get a Medicare Summary Notice (MSN) in the mail every 3 months. The notice shows  all your services or supplies that providers and suppliers billed to Medicare  during the 3-month period, what Medicare paid, and what you may owe the  provider. This notice isn’t a bill.

How to Review Your MSN

• If you have other insurance, check to  see if it covers anything that Medicare  didn’t.
• Keep your receipts  and bills, and compare them to your notice to be sure you got  all the services, supplies, or equipment listed.
• If you paid a bill before you got your notice, compare  your notice with the bill to make sure you paid the right amount for your  services.
• If an item or service is denied, call your doctor’s or other  health care provider’s office to  make sure they submitted the correct information. If not, the  office may resubmit. If you disagree with any decision made, you can file an appeal.

Check Your MSN on MyMedicare.gov

You don’t  have to wait for your MSN to view your Medicare claims. Visit www.MyMedicare.gov to track your Medicare claims or view  electronic MSNs. Your claims will generally be available within 24 hours after  processing.