I've had the same thought. It'd add clarity (as in, an actual answer to "WTF will this cost me, after insurance?"), reduce complexity ("well, we have different

I've had the same thought. It'd add clarity (as in, an actual answer to "WTF will this cost me, after insurance?"), reduce complexity ("well, we have different rates depending not only on which insurance provider you have but on the specific plan you have", and associated personnel to manage that and similar BS) and, most importantly, it'd incentivize insurance providers to work collectively to drive down prices—I suspect they'd avoid free-riding by forming associations for which a given hospital accepts all or none of the member insurances. Or we could just have single payer. But if we can't have that, I think the above would be a fair bit better than the mess we have now.