First off, I am a salaried physician. I get no additional "performance" incentive.
Secondly, many physicians may have taken that patient to the operating room without the echo. They might have blocked that arm. They might have done it under local. They might have done a whole host of other anesthetic techniques to avoid the complication.
The patient wanted to be "out" for the procedure. I heard a murmur. I insisted, having had one of my colleagues kill a patient a few weeks ago after inducing anesthesia on a patient with critical aortic stenosis, on the echocardiogram.
My assertion is that a lot of studies attempt to quantify the inscrutible. There is and always will be an individual practice variability. We all have our own forms of cognitive bias in a given clinical situation. To expect that we will all follow the same rules, and that somehow that is or should be predicated on whether or not someone gets an additional charge, is ridiculous.
I literally know hundreds of physicians professionally and personally. The ones that order unnecessary tests (and they are extremely rare) usually do so because they are nervous-nellies, not because they think they will get more money from an insurer. I'm a bit disappointed in you with your focus on physicians, when it is the private insurance business that is the real demon here. (Just look at what the top executives at Aetna make every year, in salary, bonuses, and stock options... I assure it is more than what 99.9% of physicians in the U.S. make).
So, I ordered what may have been by some considered to be an unnecessary test for the procedure undertaken. And, the results of that study didn't alter my anesthetic plan, although they could have.
I had no way of knowing that before I took that patient to the operating room and, if I'd killed him because of something I'd missed and could've prevented, I wouldn't have been able to live with myself.
This is the part of what we do that critics, like yourself, who believe we're out there trying to scam the public don't see. What's worse, is that you don't really have any solutions to what you perceive to be the problem either. You just like to cherry-pick studies that, in your own way, confirm your already preconceived notions and own form of cognitive bias.
~Dr. Imago