Rituxin treatment costs

I think this was discussed to a degree in the past but wondering if anyone has any info on a recent Rituxin treatment cost.  I just finished 4 rounds of infusion of I think 500mg each and it looks like the hospital is trying to bill the insurance around $48k USD per treatment (so nearly $200k total). I know I was given a biosimilar (ie: generic) instead of actual Rituxin this time.  From what I remember from last time (couple years back) this seems like 4x the previous cost using actual Rituxin.  Could this be right?  My costs are capped so I should be ok but still, this seems like complete crazy town. I know insurance won't pay that rate as it's not their negotiated rate but still, this seems totally bonkers.  How possibly could someone without insurance even get treated like this?  I know I'd just tell them I'd risk it if I was in that situation and not get treated since of course, that's so insane.
 

Hi, my 6 Rituxun infusions cost, before discounts, $16,500 each. Thankfully I’d already met my out of pocket prior to receiving then.

Thanks for the reply. Yeah, they really did bill over $200k for the 4 treatments.  I can't understand it.  A large part of it was the medicine cost. Seems 100% insane it could still be that much when it's off patent and I got a biosimilar (generic).