Microsoft’s new AI system, MAI-DxO, has shown that it can diagnose difficult medical cases more accurately than generalist doctors in research tests. It works like a virtual team of doctors: one AI suggests possible illnesses, another selects tests, and others challenge the conclusions until a final diagnosis emerges.
On 304 very complex cases from the New England Journal of Medicine, MAI-DxO got the diagnosis right in 83% of cases. Doctors using textbooks and the internet got 36% right, while doctors without such help got 22%. On common emergency-room cases, the AI scored 80% , compared with 47% for doctors.
The big promise is not that AI will replace doctors, but that it may become a powerful second opinion — especially where specialists are few, waiting times are long, or diagnosis is difficult. The system also tries to order fewer unnecessary tests, which could reduce cost and delay.
These results are still from historical, text-based case records, not live patient consultations. Microsoft is now testing the system with Beth Israel Deaconess Medical Center in Boston, where its recommendations will be compared with doctors’ decisions in real clinical settings. If successful, AI could support early screening, diagnosis, treatment planning, monitoring, and follow-up — while doctors retain responsibility, empathy, and final judgment.
AI WILL NOT REPLACE DOCTORS—BUT DOCTORS WHO USE AI WELL MAY TRANSFORM MEDICINE.
Sanjay Sahay
Have a nice evening.