Just my 2 cents, but I would ask the AHJ. If there are machines, that touch a "patient",(doctor or not) then I would go with sec. 517 of the NEC. If there are no machines that touch a patient, then I don't believe you would need it. I would get a letter in writing from the "Doctor"/chiro people for your records stating that there will not be any machines touching people. This might help protect you.