Blue Cross Blue Shield of Massachusetts says it will become the first health insurer to participate in Google Health, a medical records initiative by the online search engine.

Massachusetts' Blues plan said Thursday that it expects to begin offering the free electronic service to its roughly 3 million members this fall. Members will have the chance to open a Google Health account and authorize sharing of their medical claims data with the online service.

While the initiative has raised some privacy concerns, the goal is to enable people to organize, store and manage their medical records in one secure location.

Google Health was launched last month with several health care providers, including Boston's Beth Israel Deaconess Medical Center, and pharmacies including CVS and Walgreens.

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