Obamacare health plans have been criticized for severely restricting the doctors and hospitals that patients can see. But sometimes even those limited provider lists are riddled with errors, causing additional headaches for patients who had purchased a plan hoping to keep their physician only to later discover that doctor isn’t fully covered by insurance.

Marketplace insurers are fighting lawsuits from consumers in four different states who say they were misled about which health providers were covered under their plan. It wasn’t until after purchasing the plan, these patients allege, that they learned their doctor or hospital was outside its network and therefore covered only partially or not at all.