A study of 6,675 trauma patients treated at the Johns Hopkins Hospital found that almost 90% of those who returned for follow-up care at the emergency department didn't qualify for readmission, suggesting their needs could have been addressed at outpatient clinics. Reporting in the Annals of Emergency Medicine, researchers said the odds of unnecessary visits to EDs were 60% higher among Medicaid- or Medicare-insured and uninsured patients compared with privately insured patients.

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