Summary of article from Gov Info Security, by Marianne Kolbasuk McGee:
Kaiser Foundation Health Plan reported a data breach affecting 13.4 million individuals due to unauthorized access/disclosure from its previous use of online tracking technologies on its websites and mobile applications. Personal information potentially transmitted to third-party vendors like Google, Microsoft Bing, and Twitter includes IP addresses, names, account sign-in information, website navigation data, and search terms. No sensitive information like usernames, passwords, Social Security numbers, or financial account details were disclosed. Kaiser Permanente has since removed these online technologies and implemented measures to prevent such incidents in future. Despite no known misuse of the personal information, the organization will notify affected individuals directly in May out of caution.