from arstechnica:
Google has access to detailed health records on tens of millions of Americans

Google quietly partnered last year with Ascension—the country’s second-largest health system—and has since gained access to detailed medical records on tens of millions of Americans, according to a November 11 report by The Wall Street Journal.

The endeavor, code-named “Project Nightingale,” has enabled at least 150 Google employees to see patient health information, which includes diagnoses, laboratory test results, hospitalization records, and other data, according to internal documents and the newspaper’s sources. In all, the data amounts to complete medical records, WSJ notes, and contains patient names and birth dates

From the comments:

I’m minded of a couple who went to a tropical island, got a tropical disease, came home and the story didn’t publish their names.
But the general location of the couple’s residence, when they were in the tropical island, their ages and other identifying data was published, and in no time at all, the couple were outed on social media.
It doesn’t matter if names and addresses and such aren’t applied. It’s easy enough to figure it out form a bit of social media and a good memory.