By Jim Finkle BOSTON (Reuters) - Health insurer Premera Blue Cross said on Tuesday it was a victim of a cyberattack that may have exposed medical data and financial information of 11 million customers, in the latest serious breach disclosed by a healthcare company. Premera said the attackers may have gained access to claims data, including clinical information, along with banking account numbers, Social Security numbers, birth dates and other data in an attack that began in May 2014. It is the largest breach reported to date involving patient medical information, according to Dave Kennedy, an expert in healthcare security who is chief executive of TrustedSEC LLC. About 6 million of the people whose accounts were accessed are residents of Washington state, where customers include employees of Amazon.com Inc , Microsoft Corp and Starbucks Corp , according to Premera. "Medical records paint a really personal picture of somebody's life and medical procedures," Kennedy said.

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