There's a big difference between not being able to provide an exact estimate because of unforeseen events[1] and not providing an estimate that includes services that are being provided to pretty much everyone visiting the health care provider for the given condition. I mean the nurse and the doctor costs quoted above are not "unforeseen".

[1] If you're going to try to say that what is "unforeseen" is relative it's not that relative, you can get an independent committee of doctors and provide a percentage based on their experience how much often that event is expected in that situation