I have seen similar issues with Medicare reimbursement.
It's all about the contracted rate. A provider can bill insurance companies whatever they want, but that doesn't mean they will get that amount.
For instance I get physical therapy on a regular basis. My PT bills Medicare around $300/visit. However Medicare's contacted rate (which both parties agreed to) is about $120.
When a doctor or hospital contacts with an insurance company as an in network provider there is typically very little leverage the smaller offices have. A take it or leave it.
Larger providers like hospitals have more leverage, but only if they are contracted as in network. Often times individual procedures will have different contracted rates that have been negotiated.
I imagine what is happening in this case is:
Hospital is looking at average market rates in the area for BA and GCS. As it is in the interest for all hospitals and surgeons in a given region to set their market rate high, it thus forces insurance companies to base their reimbursement at a higher price. This is often the average rate between the lowest priced provider and highest priced provider in a given region.
So. If the lowest advertised price to insurance companies for GCS is $70,000 and the highest is $150,000 the reimbursement that insurance companies might for be willing to pay is $110,000 assuming there are only two providers in the area/region.
These prices might also be different for in network vs out of network.
Basically it pays for all providers offering A particular procedure in a given region to set all of this prices quite high, thus inflating the market rate.
If one provider put their bid out to insurance companies for say $27,000 and the highest bid was still $150,000 the reimbursement rate could then be set $88,500 again assuming there are only two providers in the area.
Often times for rare procedures that are infrequent, and thus not every doctor can perform them, and not every insurance plan will cover them the provider will have a cash price that is in reach for a large portion of their potential patients, giving them a regular steam of clients/patients.
They then use the much higher reimbursement rate from insurers to offset the low reimbursement of cash pay patients. This both makes their average reimbursement rate much higher, potentially offsetting any losses while allowing patients without insurance the opportunity to have the same procedure.
Hopefully that makes sense on why the statement you received was so much higher than what you were quoted as (I assume) a cash price.
~Brooke~