California’s Obamacare customers can expect a hefty increase in their monthly health insurance premiums next year.

Covered California, the state’s Obamacare marketplace, released proposed premiums Tuesday morning, and the statewide average increase for 2017 will be 13.2 percent.

Peter Lee, the agency’s executive director, cited factors including increased medical costs and the end of a federal “reinsurance” program as main drivers of the increase.

Blue Shield and Anthem Blue Cross customers will face the steepest increases.

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