Pretty standard for whole industry too - procedures may be different but similar mechanisms for hospitals, doctors, etc. My dad's final bill for his hospitalization was $3-400K - included brain surgery. Medicaid probably paid 1/4. Retail would pay full price with help from "charity" funds/writeoffs - just like pharma help to patients. It really destroys transparency something that has really helped all health providers.
I'm not sure either ;) Gottlieb makes reference to multiple incentives that keep the current system going, and taxes isn't one. But I've seen passing reference to it in some writeups. Perhaps incorrect - but it is plausible to me that the different forms of $ could be treated differently from a tax standpoint.