The House Bill I read said 11 (and 7 for drugs). I do see the link cited says 13/9. I do not know if the Senate changed this or what.
IMO, 11/7 is far better for us (as debt holders in the US Treasury). One of the clear issues from recent years is BP jacking up the prices in the years just prior to generic competition. So that is the most crucial time to let Medicare negotiate.
The 13/9 provision makes this basically toothless nothing. By then free market competition can set in so no need of negotiation.
BTW, this factors little into NWBO valuation. Though does play into BP valuation.