Todd Lovshin, PacificSource's vice president and Montana regional director, told the Associated Press the company has filed for an average 11 percent rate hike for a standard "silver plan" atop the 7.4 percent increase. That hike applies to about 43 percent of PacificSource's Montana marketplace, Lovshin said.

Commissioner of Securities and Insurance Matt Rosendale said he was disheartened that two companies would change their rates at the last minute.

“My department was advised by both companies just months ago, that with or without CSR payments, they would be able to honor the rates they provided to us and the public. Today, by their actions, they inform me that was not true,” Rosendale said in a statement. “These last minute adjustments will cause increases in the amount of premium many individuals will be required to pay for health insurance from those two companies. I caution consumers who have already made decisions to purchase plans to go back and re-evaluate their options before open enrollment begins.”

But without refiling its rates, the Montana Health Co-op said it would be forced to drop from the insurance exchange. The Co-op covers 20,000 Montanans through the exchange.