This change has been a long time coming. The first computer-aided diagnosis systems date back to the 1970s. They were evaluations, not real diagnostic tools, because no one was willing to risk relying on a computer for diagnoses. But that is all about to change -- among other projects, the "Watson" system, the clever system that won on Jeopardy, is now being programmed to come up with diagnoses and treatment plans.
AI won't "save health care" -- that's overhyped --but it will certainly create consistently high quality diagnoses and treatment plans.