>> reporter: it's been a while since joe, meredith, luca and katlyn had to skip school or work for a doctor's visit. >> two years in a row these two. perfect attendance. no tardies, no late. >> no suck days. -- sick days. >> something to do with our health care, what do you think? >> reporter: their doctor comes to them whenever they need him. meet dr. brian thornburg. >> everything you need is in there. >> this and a computer so i have access to all their medical records. >> reporter: he's one of a growing number of concierge doctors. more than 10,000 who for a fee offer personalized care, round-the-clock access, often treating their patients at home from check-ups to the occasional stitch or two. our consumer health advocate says there can be hidden savings in concierge medicine. break this down for us. >> they don't have to take off