Anthem disclosed the new time frame on its data breach as it prepares to offer two years of free identity-theft protection to millions of affected consumers.

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Anthem said Thursday that hackers had access to customer data going back to 2004 as investigations continue into the massive breach.

The nation’s second-largest health insurer disclosed the new time frame as it prepares to offer two years of free identity-theft protection to millions of affected consumers starting Friday.

Anthem said last week that hackers infiltrated one of its giant databases containing Social Security numbers, birth dates, addresses and other personal information of up to 80 million Americans.

The Indianapolis-based company said its internal investigation continued and it hadn’t determined which customers might have been affected.

In the meantime, Anthem said all current and former customers going back to 2004 can begin enrolling Friday for two years of identity-theft protection and free credit monitoring.

Consumers can sign up and learn more details online or by calling (877) 263-7995.

“Our goal is to provide peace of mind to consumers, while minimizing frustration,” the company said in a statement. “Consumers will be able to sign up for these services, which will be offered free of charge for two years, beginning Friday.”

Anthem faces multiple government investigations by the FBI, federal health-care officials and state insurance commissioners.

“We appreciate the identity-protection services being put into place by Anthem, but reviewing the scope and implications of this event will be a long process,” said Monica Lindeen, Montana’s commissioner of securities and insurance and president of the National Association of Insurance Commissioners.

Anthem has more than 37 million customers in California and 13 other states. But the company warned last week that the database that was breached also had information on other Blue Cross Blue Shield patients from all 50 states who had sought care in Anthem’s coverage area and under Anthem policies.