Harvard Pilgrim Health Care, the Wellesley-based health insurer, confirmed Thursday that it laid off 65 workers, reducing its three-state workforce by about 6.5 percent to 1,265.

Sixty-two of the job cuts were in Massachusetts, said Joan Fallon, a spokeswoman for the insurance company.. In addition, Harvard Pilgrim will eliminate 35 open positions, but will add 12 new ones, according to Fallon. The insurer plans to expand into a fourth state, Connecticut, next year.

In a statement, Harvard Pilgrim said the cutback was “part of a strategic plan to align... organizational structure with the changing health care environment.” It said the insurance carrier will provide severance and support services for employees who were laid off.

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In addition to Massachusetts, the insurer has operations in Maine and New Hampshire.