sentences:  DPC is a mass-market variant of concierge medicine, distinguished by its low prices.Simply stated, the biggest difference between direct primary care and retainer based practices is that DPC takes a flat rate fee whereas models usually charge an annual retainer fee and promise more access to the doctor.The concierge medicine model, although not the term, originated with MD² International, which was founded in 1996 in Seattle by Dr. Howard Maron and Dr. Scott Hall.