A primary care physician simply manages your health care needs. There are no special perks offered to patients. For example, if you call your primary care physician for an appointment, you might wait weeks to be seen. If you have an emergency, you have to rely on urgent care centers or the ER for help. Those doctors simply forward your information to the primary care physician.
A concierge doctor is your primary care physician, but much more. You get VIP service in the office and immediate appointments. If there is an emergency, the doctor is available to you.