Annals of emergency medicine
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Many policymakers believe that expanding access to outpatient care will reduce emergency department (ED) use. However, outpatient health care providers often refer their patients to EDs for evaluation and management. We examine the factors underlying outpatient provider referral, its effect on ED visit volume, and whether referred ED visits are more likely to result in hospitalization than self-referred visits. ⋯ Almost one quarter of individuals' most recent ED visits were driven by referrals from outpatient health care providers. Being referred to the ED by an outpatient provider is strongly associated with the seriousness of one's medical condition, which also increases the odds of hospitalization compared with ED discharge. After controlling for seriousness of medical condition, ED referral by an outpatient provider continues to have an independent association with hospitalization.