Health information exchanges need to understand the optimal catchment area of their providers' patients in order to be successful and better serve their participating providers, according to a new study published in the Journal of the American Medical Informatics Association. The study evaluated the demographics of the New York Clinical Information Exchange, a regional health information organization serving providers in midtown Manhattan. It revealed that almost 90 percent of the patients served by the providers lived within 30 miles of Times Square. This kind of information should help HIEs determine which new provider participants should be added to their networks. Abstract