After a major security breach, Banner Health Systems had to contact 3.7 million customers to inform them their information may have been compromised by hackers.

The cyberattack originally targeted systems that process food purchases at company facilities. Through that breach, hackers were able to infiltrate the company's far more valuable health records.

"The patient and health plan information (compromised) may have included names, birth dates, addresses, physicians' names, dates of service, claims information, and possibly health insurance information and Social Security numbers," the company said in a statement.

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