sentences:  In 2012, there were 4,400 private physicians – a 25% increase from 2011.The concept of concierge medicine has been accused of promoting a two-tiered health system that favors the wealthy, limits the number of physicians to care for those who cannot afford it, and burdens the middle and lower class with a higher cost of insurance.Detractors contend that while this approach is more lucrative for some physicians and makes care more convenient for their patients, it makes care less accessible for other patients who cannot afford (or choose not) to pay the required membership fees.