Trump administration policies — or the murkiness surrounding them — will increase millions of Americans’ health care premiums by double digits in 2018, a new nonpartisan study found.

In Wilmington, Del., for instance, consumers can expect a 49 percent hike on their rates.

President Donald Trump has sent mixed signals on how he plans to enforce the 2010 health care law, and the bill’s future in Congress, which has vowed to repeal and replace it, is uncertain.

The Kaiser Family Foundation’s analysis released Thursday said these circumstances have prompted insurers to charge higher premiums in 2018 than otherwise expected.

“Insurers attempting to price their plans and determine which states and counties they will service next year face a great deal of uncertainty,” the study said.