Not just Medicare, it's all in some states: Dr, cert. nurse pract, dental, surgeons, ophthalmologist, allergists, derm, nose & throat, gastro - you name it...due to their own cost of their own medical insurance, quality staff to be hired in their practices, or how treated by their employer, the patients themselves, wages, being far over worked by hospitals without proper supplies ("budget cuts")- staff shortages, better jobs elsewhere, leaving for different medical job, life is too short new location being closer to where their aging parents or grandkids are, etc's are many that I have heard from themselves. Some felt at their age they were being used up after all those years and wanted time-retirement for themselves since they were no longer able to make a difference.