This is a Medicare Card. Everyone’s Medicare Number is their Social Security Number.
Conversation with Medicare Appeal Board:
“Do you have the Social Security Number of the person who is appealing?”
“Sorry, I don’t.”
“That’s okay. Do you have their Medicare Number instead?”
I rest my case.

Now I don’t deal to well with logic so I wouldn’t deal too well with that!
Yes, Forrest, nuff said!
Palm slap to forehead.