When The New York Times and The Observer broke the news in March that a little-known consulting firm named Cambridge Analytica had used private data from millions of Facebook users, allegedly without their consent, few readers could have foreseen the major implications for their health care. They certainly could not have known that Cambridge Analytica’s client list extended far beyond the victorious political campaigns of Ted Cruz and Donald Trump, to a major healthcare provider, New York University’s Langone Hospital, and a major insurance provider, the London-traded Hiscox Ltd.