Aug. 19 (Bloomberg) -- Chinese hackers stole social securitynumbers, names and addresses from 4.5 million patients of CommunityHealth Systems Inc., the second-biggest for-profit U.S. hospitalchain, according to the company.

The attacks occurred in April and June, the Franklin,Tennessee-based company said yesterday in a U.S. regulatory filing.The hacker group originated from China and bypassed the company’ssecurity system, making off with non-medical information frompeople who visited doctors’ offices associated with thecompany.

“Unfortunately, we have joined numerous American companies andinstitutions who have been victimized by highly sophisticated,criminal cyber-attacks originating out of China,” Tomi Galin, aspokeswoman for Community Health, said in an e-mail. “Importantly,no patient medical or financial information was transferred as aresult of this intrusion.”

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