记忆中，年轻医生6-10年要recertification, retake certification exams, 所有年纪的医生每2-3年要keep 一定的CME hours to renew license. 我所在的州，每两年就要renew license。
For example, the Illinois State Medical Society requires that doctors renew their licenses once every three years. Within the physician license renewal period, doctors must earn 150 hours of Continuing Medical Education (CME) credits to ensure that they are maintaining their knowledge.
受聘于医院的医生，还有一系列的CME (continuing medical education )的学习，包括设备更新，知识更新，技术更新，药物更新，Board practice requirements 更新，以及ethics CME等等。
有些收费，与保险，与prescription policy 有关。
无意中看到有个ID对医生误解，上来解释一下。
谢谢理解。
