Health insurance giant Anthem said 13.5 million Californians were affected by a data breach that the company disclosed this month.
The nation’s second-largest health insurer said a cyberattack had exposed names, Social Security numbers, dates of birth and other sensitive details on up to 80 million Americans.
Anthem has continued to investigate the depth of the data breach, and Tuesday it reduced that overall figure slightly to 78.8 million people affected. It also released more detailed numbers by state.
The tally in California is 13.5 million current and former Anthem customers dating back to 2004 as well as other Blue Cross Blue Shield members who received care in the state.
Large employers, for instance, often have workers scattered across the country and treated under various Blue Cross Blue Shield health plans.
Federal health care officials and state insurance commissioners are investigating whether Anthem took sufficient security measures to safeguard its database.
Anthem is California’s state’s largest for-profit health insurer and leads the state insurance exchange in Obamacare enrollment.
