Insurance reimbursements for primary care doctors have remained relatively flat over the past 15 years, forcing doctors to pack in 20 to 30 patients a day -- and creating a business opportunity, said Wayne Lipton, managing partner at Concierge Choice Physicians in Rockville Centre. Studies show doctors spend 20 minutes or less with patients, but with concierge medicine people pay extra to get more time and quicker scheduling from their doctors.