(Bloomberg) -- The U.S.’s biggest health insurer is considering pulling out of Obamacare, a month after saying it would expand its presence in the program.

UnitedHealth Group Inc. is scaling back marketing efforts for plans it’s selling this year under the Affordable Care Act, and may quit the business entirely in 2017 because it has proven to be more costly than expected. It’s an abrupt shift from October, when the health insurer said it was planning to sell coverage in 11 new markets next year, bringing its total to 34. The company also cut its 2015 earnings forecast.

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