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Paging Dr. Algorithm: Microsoft’s AI Diagnoses Like House, Bills Like Costco

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Paging Dr. Algorithm: Microsoft’s AI Diagnoses Like House, Bills Like Costco

Satya Nadella wants AI to be your next doctor.

The Microsoft CEO announced two healthcare AI advances on social media this week, including MAI-DxO, a system that simulates multiple virtual doctors working together to solve medical mysteries.

In testing against 304 complex cases from the New England Journal of Medicine, Microsoft reported that the AI correctly diagnosed 85.5% of them. A group of 21 experienced physicians tackling the same cases? They got 20% right.

“Excited to share two advances that bring us closer to real-world impact in healthcare AI,” Nadella wrote. “MAI-DxO is a model-agnostic orchestrator that simulates a panel of virtual physicians. It achieves 85.5% diagnostic accuracy—four times that of experienced doctors—while cutting diagnostic costs.”

Excited to share two advances that bring us closer to real-world impact in healthcare AI:

SDBench introduces a new benchmark that transforms 304 NEJM cases into interactive diagnostic simulations. AI must ask questions, order tests, and weigh costs, mirroring the complexity of… pic.twitter.com/lASC4hK730

— Satya Nadella (@satyanadella) June 30, 2025

The announcement comes as Microsoft joins a crowded field of tech companies racing to apply AI to healthcare’s thorniest problems.

With Americans spending nearly $5 trillion annually on healthcare—and diagnostic errors affecting 12 million people each year, according to Johns Hopkins University—the idea of using AI to address human-related issues seems like a no-brainer.

How Microsoft’s Medical Council Works

MAI-DxO works like a medical dream team trapped in a computer. The system tackles cases through what Microsoft calls the Sequential Diagnosis Benchmark, or SDBench.

Instead of multiple-choice questions like traditional medical AI tests, it mirrors how doctors actually work: starting with limited information about a patient, asking follow-up questions, ordering tests, and adjusting theories as new data arrives.

Each test incurs a cost in virtual money, forcing the AI to balance thoroughness against healthcare spending.

In other words, it basically simulates a medical council debating a case, with different models playing different roles. The models debate, disagree, and eventually reach a consensus, just like your physicians would if you were a challenging case to study.

In one configuration, MAI-DxO achieved 80% accuracy while spending $2,397 per case, approximately 20% less than the $2,963 that physicians typically spend.

At peak performance, it achieved 85.5% accuracy at a cost of $7,184 per case. By comparison, OpenAI’s standalone o3 model achieved 78.6% accuracy but cost $7,850.

Paging Dr. Algorithm: Microsoft’s AI Diagnoses Like House, Bills Like Costco

Image: Microsoft

The virtual physician panel includes Dr. Hypothesis, who maintains a running list of the three most likely diagnoses using Bayesian probability methods.

Dr. Test-Chooser selects up to three diagnostic tests per round, aiming for maximum information gain.

Dr. Challenger acts as the contrarian, seeking evidence that contradicts the prevailing theory. Dr. Stewardship vetoes expensive tests with low diagnostic value.

Meanwhile, Dr. Checklist ensures all test names are valid and the team’s reasoning stays consistent.

Paging Dr. Algorithm: Microsoft’s AI Diagnoses Like House, Bills Like Costco

Image: Microsoft

Microsoft tested the system on cases published in the New England Journal of Medicine between 2024 and 2025, after the AI’s training cutoff date, eliminating any possibility the model had memorized the answers.

The studies were difficult cases that required thorough examination to be properly diagnosed.

The 21 physicians Microsoft recruited for comparison had between 5 and 20 years of experience, with a median of 12 years.

They worked without access to colleagues, textbooks, or AI assistance to ensure a fair comparison of raw diagnostic ability. They reported a 20% success rate on these admittedly difficult cases.

The system operates in several modes. “Instant Answer” provides a diagnosis based solely on initial information for $300—the cost of one physician visit.

“Question Only” allows follow-up questions without ordering tests. “Budgeted” tracks costs with a maximum spending limit. “No Budget” gives the panel free rein, while “Ensemble” runs multiple panels and aggregates their conclusions for maximum accuracy.

The Future of Medicine?

MAI-DxO represents Microsoft’s broader push into consumer health AI.

The company reports over 50 million health-related sessions daily across its Bing and Copilot products. From knee pain searches to urgent care lookups, Microsoft sees search engines and AI assistants becoming the new front door for healthcare.

Of course, this is just one more step in a very long timeline of medical tech.

For context, Stanford’s MYCIN system diagnosed bacterial infections in the 1970s, and Google’s AMIE simulated doctor-patient conversations just last year.

Microsoft developed MAI-DxO as a model-agnostic system, meaning it can work with AI models from different companies.

In testing, it boosted performance across models from OpenAI, Google, Anthropic, Meta, and others by an average of 11%. The improvement was statistically significant across all tested models.

Dr. Dominic King and Harsha Nori, who led the research at Microsoft AI, emphasized in a blog post that the technology remains a research demonstration.



“Important challenges remain before generative AI can be safely and responsibly deployed across healthcare,” they wrote. The system excels at complex diagnostic challenges but needs testing on routine cases.

Microsoft plans to submit the research for peer review and is working with healthcare organizations to validate the approach in clinical settings.

The company has made clear that any deployment would require “rigorous safety testing, clinical validation, and regulatory reviews.”

For now, MAI-DxO remains confined to research labs. But with diagnostic errors contributing to nearly 10% of patient deaths and affecting millions annually, Microsoft’s virtual physician panel represents another step toward AI-assisted healthcare.

The five-doctor AI team might diagnose better than 21 human physicians combined, but it is still too early to see a mainstream implementation.

Microsoft says AI won’t replace doctors; it will augment them. The 21 physicians who scored 20% on those brutal NEJM cases are probably hoping that’s true.

Edited by Sebastian Sinclair and Josh Quittner

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