That's true for penicillin, but what about more exotic medical procedures? "Socialized" medicine is railed against for "rationing" but all markets have rationing as well. The whole point of a market is to ration resources to those most willing and able to pay.

But yes. In general the line that matters is "Can I afford it?". If it doesn't exist, the answer is no for everbody. If it does exist, and has a price tag on it, the answer is no for some people and yes for others. The "no"s in the latter situation are pretty much in the same situation as they were before the good existed.