The billing is complex on biologics. My insurance is billed $6,600 for my remicade medication which is 4 vials of 100 mL. Insurance disallows half that amount. So, it's paid in full at $3,300.
Let's throw some numbers in there. So, where'd the 20-30 percent off come from? The $1,650 a vial billed amount? A 30 percent discount would be a $495 discount per vial, bringing it's cost down to $1,155 for a single vial of Inflectra. That's $1,155 x 4 is a total of $4,620 billable for my 4 Inflectra and a $1,980 savings on the billable amount versus remicade. The 20 percent discount would make the total savings $1,320 in my case. Then we get to disallowed amounts (or negotiated rates) that are unique to each insurance and harder to predict.
Still an expensive medication but a little less expensive.
Here's something I found as well, from the other side of the pond (UK):
Both Inflectra® and Remsima® have a NHS list price of £377.66 or $533.24 per 100 mg vial, which is 10% lower than the list price of Remicade® (£419.62 or $592.48 per 100 mg vial). However, the actual cost of Remicade® and the biosimilar products differs substantially from list prices due to locally negotiated procurement discounts.
Source:
ntag.nhs.uk/docs/app/NTAG-Appraisal-Report-Infliximab-Biosimilars-web.pdfTypical, USA pays waay more for meds...