(Bloomberg) -- Social Security numbers, names and addresses for millions of people who aren’t customers of Anthem Inc. may have been breached in a massive cyberattack disclosed by the health insurer earlier this month.

Anthem, which runs Blue Cross and Blue Shield plans in 14 states, believes information on 78.8 million people was accessed by hackers. Of those, about 60 million to 70 million were customers of the Indianapolis, Indiana-based insurer, spokeswoman Kristin Binns said in an e-mailed statement Tuesday.

See also: Anthem Breach: Warnings, Lessons for Insurance Companies

The remainder includes millions of people who aren’t Anthem members, but used their Blue Cross or Blue Shield insurance in states, including Texas and Florida, where Anthem operates partnerships. Binns said it was too soon to put an exact number on how many non-members were affected.

Anthem said Feb. 4 that personal information of its customers and employees had been breached by hackers. The company still doesn’t believe that any financial or confidential health information was accessed.

Anthem, formerly known as WellPoint, said it would provide free credit monitoring and identity protection services to customers whose data was compromised.

The Anthem breach is the biggest in the health-care industry since Chinese hackers stole Social Security numbers, names and address from 4.5 million patients of Community Health Systems Inc., the second-biggest for-profit hospital chain, last year. The attack is on a similar scale to hacks of customer data from Target Corp. and Home Depot Inc. last year, in terms of the number of people affected.

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