Google is engaged with one of the U.S.’s largest health-care systems on a project to collect and crunch the detailed personal-health information of millions of people across 21 states.

The Wall Street Journal first reported on Monday that the company has teamed up with Ascension, the second largest healthcare services company in the country, for a project that was being code-named Nightingale. 

Amazon.com Inc., Apple Inc. and Microsoft Corp. are also aggressively pushing into health care, though they haven’t yet struck deals of this scope.

The data involved in the initiative encompasses lab results, doctor diagnoses and hospitalization records, among other categories, and amounts to a complete health history, including patient names and dates of birth.

Neither doctors nor the patients in the 21 states where it will be used had been told about it. 

As many as 150 Google employees have already seen some people’s data, it is reported. 

Some Ascension employees have raised questions about the way the data is being collected and shared, both from a technological and ethical perspective, according to the people familiar with the project. But privacy experts said it appeared to be permissible under federal law. That law, the Health Insurance Portability and Accountability Act of 1996, generally allows hospitals to share data with business partners without telling patients, as long as the information is used “only to help the covered entity carry out its health care functions.”

Google hopes to use the data in part to design new software, underpinned by advanced artificial intelligence and machine learning, that zeroes in on individual patients to suggest changes to their care.

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