AFAIK Canada gets around this problem by capping the number of billable patients a doctor can see per day (adjusted by specialty of course). Any patients in excess of the cap is only paid by the government at a steeply discounted rate.

This discourages doctors from overworking themselves and offering shoddy care (instead choosing to move patients through like a cattle farm), and also discourages the sort of unnecessary treatment this article talks about.

I suspect that the doctors at this hospital would be well under the quota you speak of. Remember, the author suggested the hospital might lose it's accredition for this type of surgery since they didn't do enough of them.