For this to be true we'd need two variables to be accurate:
X - contract rate of $200/unit or more
Y - billing 20-25 units, on average, for a labor epidural
Since the extreme large majority of practices in the South do not get $200/unit (my guess is out of all of them, and out of all of their contracts, there may be 1 or 2 contracts that give this rate, and they're AMCs) and most labor epidurals do not bill for 20-25 units, then your statement is not true for the extreme large majority of practices.
If X were $100/unit then it gets even more absurd. Y would necessitate 40-50 units, on average. It's not happening.
Also, most insurers these days, to my knowledge, are reimbursing labor epidurals at a flat rate.
Your reimbursement for a CS is wrong for the same reasons.
Don't get me wrong. I wish it were true! But it's not happening. I'm sorry you're wife was cared for by the 0.1% AMC with the best contract out there, and that she was in labor forever. Hope all ended well!