ANDY KESSLER: Siri, Am I About To Have A Heart Attack?

ObamaCare was always about paying for health care—costs have outpaced inflation for decades—but seldom about keeping people healthy. As Republicans repeal and replace, they need a vision for the path to better care. Technology now exists to provide cheaper and higher-quality health care, but giant roadblocks stand in the way.

That technology is artificial intelligence and machine learning. The algorithms behind AI are painfully complex, but the final product is simple—think Google Translate or Amazon’s Alexa. Saying a phrase and immediately having it translated is cool. Being told that your week of bad sleep and slight stomach pains could be cancer is life-altering.

Machine learning is already invading health care. Experts at Kaggle, an artificial-intelligence research firm, shared a few real-world applications of the technology with me: Predicting heart failure by looking at massive amounts of MRI scans, diagnosing diabetic retinopathy from eye imaging, and successfully predicting seizures with a machine analyzing electroencephalogram data.

The key is data. With more of it, accuracy gets better over time.

But the people who have the data don’t want to share it.