Nothing stops a doctor or an office from saying "treatment X costs $Y."
Doctors can't say how much an insurance provider will cover or what a patient's out of pocket will therefore be, but that is a separate issue further downstream of clear pricing for treatment.
Right, and as I already pointed out below, cash pay patients have the right to demand a Good Faith Estimate (GFE) from providers under federal price transparency rules.
That shouldn't be limited to cash payers though. Insurance companies should not be part of the process of care providers pricing their service, nor should they be able to deny a charge after the fact.
Today's model is great for the insurance company, it should be great for the patient. If one wants to offer an insurance product they should be considering average cost of care based on whatever factors their actuaries come up withz they shouldn't be demanding say into pricing so they can protect their bottom line.
Doctors can't say how much an insurance provider will cover or what a patient's out of pocket will therefore be, but that is a separate issue further downstream of clear pricing for treatment.