revenue recovery from insurance settlement?

can a hospital that is paid for by me and my employer and I pay my own co-pay try to bill me for the full prorated amount of the care they provide if I settle with an insurance company that is admitting 50% fault?I got into a motorcycle accident. I did not go to the hospital in and ambulance. Due to some back pain, I used my own medical coverage with Kaiser Permanente I have through my work, Paid my own co-pay and had some physical therapy. Now, I get a bill from kaiser saying any payment from a insurance settlement will go towards paying the bill (billed for amount prorated) The insurance company that is paying for medical bills and pain and suffering is only paying me 50%. (50% at fault). The insurance company said they will cut me a check for the 50% of the bill amount and something on top for my pain and suffering. Can kaiser revenue recovery come after me for the full amount? How are they going to take money from my check thru work for my coverage, make me pay the co pay and then ask me for a pro rated bill amount?