Your question is confusing because AI is being used in Medicine right now.
And. it is clearly beneficial. I worked on an AI app that used speech recognition (which is AI) to transcribe doctors notes. I did some work on a Natural Language Processing application (which is AI) that could detect and flag errors in notes, including flagging when a prescription didn't look right.
Image Classifiers (which are AI) are already being used in looking at radiology images. And I am pretty sure that other modern medical machines use AI.
I would say that all of these AI-based technologies are beneficial. They make a doctor's job easier, save time and money, prevent mistakes, and possibly find features in a radiology images that will show a disease in a patient.
If you are talking about real AI
, as it is being used today, it is clear to me that there are some AI-based technologies are beneficial. You probably could find examples that are not so great. It depends on the technology.
If you are talking about science-fiction, or some futuristic view of AI... I would suggest that HAL 9000 from the movie 2001: A Space Odyssey
would probably not be beneficial in a medical application.