Changing primary care physicians - or whatever other term applies - is a minor PITA, but doable and not worth whining about on a news/politics discussion site. We recently changed our PCP of 4 decades because the administration of her group practice had become unresponsive and uncommunicative, but I saw no reason to mention it here, except in this post to point out the DU OP's likely shit-stirring purpose.
The trend, over the past 4 decades or so has been toward individual-practice doctors moving into group practices and medical foundations, such as Kaiser or Sutter. This has been at least partly driven by government regulatory mandates & costs, Medicare cutting fees below doctors' actual costs, and large insurance plans mandating-cutting their "full" payments for services. Group and foundation practices spread administrative costs across multiple doctors rather than just one (this puts a squeeze on doctors in small towns).