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FORT LAUDERDALE (CBSMiami/AP) — Those who purchase health insurance through the federal government exchange could see a substantial increase in their premiums next year.

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Nearly a dozen health insurers who have plans on the health insurance exchanges created under President Barack Obama’s law have requested double digit increases.

According to preliminary rate data released Monday by the federal government, one of Aetna’s plans requested a 21 percent hike, while plans for United and Coventry were looking for increases of 18 percent. United requested a 31 percent bump in one of its plans sold off the exchange. But the state’s largest health insurer, Florida Blue, has not requested a rate hike of more than 10 percent.

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State health officials are set to release the final figures in early August, but the early numbers are pointing to bigger premium increases than in 2015.

Insurers cited higher-than-expected care costs and rising expense of prescription drugs as the reason for the spikes.

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