PURPOSE Increasing use of specialist services in the United States is leading to a perception of a specialist shortage. Little is known, however, about the nature of care provided by this secondary level of services. The aim of this study was to examine the content of care provided by specialists in community settings, including visits for which the patient had been referred by another physician.METHODS Nationally representative visit data were obtained from the National Ambulatory Medical Care Survey (NAMCS) for the years 2002 through 2004. To describe the nature of care, we developed a taxonomy of offi ce-based visit types and constructed logistic regression models allowing for adjusted comparisons of specialty types.RESULTS Overall, 46.3% of visits were for routine follow-up and preventive care of patients already known to the specialist. Referrals accounted for only 30.4% of all visits. Specialists were more likely to report sharing care with other physicians for referred, compared with not referred, patients (odds ratio [OR] = 2.99; 95% confi dence interval [CI], 2.52-3.55). Overall, 73.6% of all visits resulted in a return appointment with the same physician, in more than one-half of all cases as a result of a routine or preventive care visit.CONCLUSIONS Ambulatory offi ce-based activity of specialists includes a large share of routine and preventive care for patients already known, not referred, to the physician. It is likely that many of these services could be managed in primary care settings, lessening demand for specialists and improving coordination of care.
INTRODUCTIONT here is uncertainty as to whether the United States should be training more specialists. Some argue that demand for specialists is rising and shortages are already apparent, 1-5 while others disagree. 6,7 Better information about the content of and need for care that specialists are providing in the United States would help to inform this debate. 8 The functions of primary care are well established and widely accepted 9 : fi rst-contact care, continuity with the same provider over time, delivery of a comprehensive range of services, and coordination of care.10 These benefi ts, best achieved when provided by a single, regular source of care, 11 form the basis of the recent medical home model. 12,13 Specialist physicians are needed to address conditions too uncommon for primary care physicians to maintain competence 14 and for procedures that require a high level of technical expertise or specialized equipment. 15,16 Theoretically, these activities should be the core functions of specialized care, but whether such is the case in practice or how it is accomplished is unknown.As most specialty care in the United States is clinician-initiated, 17 decisions that specialists make about routine or follow-up care can have important implications for the volume of their work and physician workforce projections. Referrals 18 are also of particular interest, not only because they result from an explicit assessment of need for specialist...