ST. PAUL — The chief executive of Minnesota’s health insurance exchange says help will be available for consumers as its largest carrier pulls out.

MNsure CEO Scott Leitz told the exchange board Wednesday he’s disappointed PreferredOne won’t offer new coverage when open enrollment begins Nov. 15, but four other Minnesota-based carriers will continue to do so.

He says MNsure plans to conduct targeted outreach efforts for current PreferredOne enrollees to help them pick new plans for 2015.

While PreferredOne customers can keep their current plans, their premiums could be higher next year. And those customers who now get tax credits to defray the costs will need to switch carriers to keep them.

PreferredOne grabbed 59 percent of all private-plan enrollees in MNsure’s inaugural year by offering low premiums, but now says that’s unsustainable.