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Published on: June 30, 2023
Association between insurance status and admission rate for patients evaluated in the emergency department
Jennifer Prah Ruger1, Christopher J Richter, Lawrence M Lewis
1Division of General Medical Sciences, Washington University School of Medicine, St. Louis, MO 63110, USA. jruger@im.wustl.edu
Objectives:
To determine if differences exist in hospital and intensive care unit (ICU)/operating room admission rates based on health insurance status.
Methods:
This was a retrospective, cross-sectional study of data from hospital clinical and financial records for all 2001 emergency department (ED) visits (80,209) to an academic urban hospital. Hospital admission and intensive care unit (ICU)/operating room admissions were analyzed, controlling for triage acuity, primary complaint, diagnosis, diagnosis-related group (DRG) severity, and demographics. Multivariate logistic regression models identified factors associated with hospital admission for under insured (self-pay and Medicaid) compared with other insured (private health maintenance organization, preferred provider organization, worker's compensation, and Medicare) patients.
Results:
Compared with the other insured group, under insured patients were less likely, overall, to be admitted to the hospital (odds ratio [OR], 0.82; 95% CI = 0.76 to 0.90), controlling for all other factors studied. Subgroup analysis of common complaints showed under insured patients with a chief complaint of abdominal pain (OR, 0.67; 95% CI = 0.55 to 0.80) or headache (OR, 0.61; 95% CI = 0.39 to 0.95) had the lowest adjusted ORs for admission to the hospital, compared with other insured patients. Under insured patients with DRG of "menstrual and other female reproductive system disorders" (OR, 0.17; 95% CI = 0.06 to 0.51) or "esophagitis, gastroenteritis, and miscellaneous digestive disorders" (OR, 0.55; 95% CI = 0.28 to 0.96) also were less likely to be admitted compared with the other insured group. No significant differences in ICU/operating room admission rates were found between insurance groups.
Conclusions:
Whereas there was no difference in admission rates to the ICU/operating room by insurance status, this single-center study does suggest an association between insurance status and admission to a general hospital service, which may or may not be causally related. Factors other than provider bias may be responsible for this observed difference.
