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Or you can leave it blank on the app and the company will send a letter for them to fill in their # when they get their card.Unfortunately it takes the new medicare number to create that account.
From Medicare.gov create account:
On the SS site you have to "get a benefit verification letter" up on the screen and go to the Medicare Information section. You can find your new Medicare number in that section. (You can look at the letter on the screen, you do not have to print it or request a copy from SS.)
