From a Washington Post column by Elisabeth Rosenthal headlined “The shrinking number of primary care physicians is reaching a tipping point”:

I’ve been receiving an escalating stream of panicked emails from people telling me their longtime physician was retiring, was no longer taking their insurance or had gone concierge and would no longer see them unless they ponied up a hefty annual fee. They said they couldn’t find another primary care doctor who could take them on or who offered a new-patient appointment sooner than months away.