Quantifying Ambulatory Care Use Preceding Emergency Department Visits and Hospitalizations for Ambulatory Care Sensitive Conditions.

Ambulatory Care Sensitive Conditions (ACSC) represent a significant source of health care spending in the United States. Existing literature is largely descriptive and there is limited information about how an emergency department (ED) visit or hospitalization for ACSCs is related to prior ambulatory care visits. A retrospective, observational study was conducted using health records from a large midwestern health system during a 20-month period between 2012 and 2014. Our primary variables were (1) type of care setting (i.e., ED visit or hospitalization) and (2) whether the patient received ambulatory care services in the 14, 30, and 60 days before the ED visit or hospital admission. Of patients seen in the ED for ACSCs, 11.9%, 16.3%, and 21.67% were seen in ambulatory care in the 14, 30, and 60 days prior, respectively. Of those hospitalized for ACSCs, 29.1%, 39.9%, and 53% were seen in ambulatory care in the 14, 30, and 60 days prior, respectively. These results highlight a potential lost opportunity to address ACSCs in the ambulatory care setting. Such knowledge can inform interventions to reduce avoidable ACSC-related acute care use and health care costs, and improve patient outcomes.