Unfortunately the problem is much greater than engineers not understanding doctors and other clinical staff, in my experience. For startups that want to sell to health systems and similar-sized/larger entities (really this is the minimum size that can work for most startups, practice sales usually have more friction than value), you unfortunately have to focus on the buyer, which is very rarely someone who is "in the…
Q: Okay, how do I pay?
A: You don't pay for health care.
Q: I'm American. I'm not part of your health care system.
A: That's all well and good, but we have no way of knowing how much to charge you, how to take your money, or where to send it. Have a nice vacation.
The clinic probably maintained some accounting records, but they simply had no billing system.