The Effects of Medicaid Expansion on Triage and Regional Transfer After Upper-Extremity Trauma

Underinsured hand trauma patients are more likely to be transferred to quaternary care centers, which burdens these patients and centers. By increasing insurance coverage, care for less severe upper-extremity injuries may be available closer to patients' homes. We evaluated whether the 2014 expansion of Medicaid in Maryland under the Affordable Care Act decreased the number of uninsured upper-extremity trauma patients and the volume of unnecessary emergency trauma visits at our hand center.

We identified all upper-extremity trauma patients between 2010 and 2017 at our hand trauma referral center. Injury severity was classified based on the need for subspecialty care. Bivariate relations between insurance status and demographic covariates, including injury type and distance, both before and after Medicaid expansion were evaluated. We used patient-level and multinomial logistic regression models to evaluate changes in payer and transfer appropriateness.

We studied 12,009 acute upper-extremity trauma patients. With Medicaid expansion, the percentage of trauma patients with Medicaid coverage increased from 15% to 24%, with a decrease in uninsured from 31% to 24%. After Medicaid expansion, non-transfer patient appropriateness decreased and appropriateness of transfers remained consistent across all payers. The average distance patients traveled for care remained similar before and after expansion.

Medicaid expansion significantly decreased the proportion of uninsured upper-extremity trauma patients. We identified no significant changes in the distances these patients traveled for specialized care. In addition, the appropriateness of transferred patients did not change significantly after expansion, whereas appropriateness of nontransferred patients actually declined after Medicaid expansion.

This study indicates no notable change in adherence to transfer guidelines after expansion, and a possible increase in use of emergency services by newly insured patients.