It varies, of direction, yet maximum medical doctors i understand consult with experts of their popular area that they understand and believe. some insurance companies require workplace work and approval and determination of physicians of their community (regardless of their capacity or the referring scientific expert or affected person's alternatives). The referring scientific expert could call the experts workplace, or could deliver a letter. in many instances, the referring scientific expert's workplace will call the professional's workplace and make the appointment for the affected person, notably if the referral is of an pressing nature.