Millions of Americans are trapped in a 'ghost network.' As some of those people have discovered, the providers listed in an insurer's network have either retired or died. Many other providers have stopped accepting insurance — often because the companies made it excessively difficult for them to do so. Some just aren't taking new patients. Insurers are often slow to remove them from directories, if they do so at all. It adds up to a bait and switch by insurance companies that leads customers to believe there are more options for care than actually exist.