The emergence of retail-based clinics in the United States: early observations.

Retail-based clinics have proliferated rapidly in the past two years, with approximately 1,000 sites in thirty-seven states representing almost three million cumulative visits. Clinic operators have evolved from a dispersed group of privately financed concerns to a concentrated, largely corporate-owned group. A major development has been the move to large-scale acceptance of insurance, deviating from the initial cash-pay model. Consumers' acceptance and the fact that the clinics appear to increase access for both the uninsured and the insured has encouraged providers and policymakers to consider this approach to basic, acute care while seeking a better understanding of these clinics.