Of the many innovations in health care delivery proposed in the context of health reform for those with chronic diseases such as diabetes, the group visit model is relatively easy to implement and is effective for improving health outcomes and patient and provider satisfaction, with a neutral to positive effect on health care costs. This article describes the evolution of group visits for those with diabetes, the theory underlying group visits for patients with chronic medical conditions, and the existing evidence for the effectiveness of this model. It also addresses implementation of groups in practice, with an emphasis on the practical aspects of program implementation, integration of behavioral expertise into medical groups, individualization in various practice settings, and reimbursement issues.