About two-thirds of Americans who work at small businesses will see health-insurance premiums increase under Obamacare, according to a new federal report.

The higher premiums will affect about 11 million Americans, according to the report from the Centers for Medicare and Medicaid Services. The report also estimated an additional 6 million individuals will see reductions in their premiums.

The report was released Friday, but came to light late Monday as some lawmakers have seized on the report’s release to voice their skepticism about Obamacare.