They are talking about the supplement payment. It is basically money that is withheld from your F/Nly payments so that if you do get a debt at reconciliation time you already have a bit up your sleeve to pay it off, otherwise if you overestimated you get it back. It doesn't matter if you get part b or not, so long as you get FTBA you will get it. I would assume that it will be paid separately to the CCR.