Bariatric surgery among vulnerable populations: The effect of the Affordable Care Act's Medicaid expansion

Background: Obesity disproportionately affects vulnerable populations. Bariatric surgery is an effective long-term treatment for obesity-related complications: however, bariatric surgical rates are lower among racial minorities and low-income and publicly insured patients. The Affordable Care Act's Medicaid expansion improved access to health insurance, but its impact on bariatric surgical disparities has not been evaluated. We sought to determine the impact of the Affordable Care Act's Medicaid expansion on disparate utilization rates of bariatric surgery. Methods: A total of 47,974 nonelderly adult bariatric surgical patients (ages 18-64 years) were identified in 2 Medicaid-expansion states (Kentucky and Maryland) versus 2 nonexpansion control states (Florida and North Carolina) between 2012 and 2015 using the Healthcare Cost and Utilization Project's State Inpatient Database. Poisson interrupted time series were conducted to determine the adjusted incidence rates of bariatric surgery by insurance (Medicaid/uninsured versus privately insured), income (high income versus low income), and race (African American versus white). The difference in the counts of bariatric surgery were then calculated to measure the gap in bariatric surgery rates. Results: The adjusted incidence rate of bariatric surgery among Medicaid or uninsured and low-income patients increased by 15.8% and 5.1% per quarter, respectively, after the Affordable Care Act in expansion states (P < .001). No marginal change was seen in privately insured and high-income patients in expansion states. The adjusted incidence rates increased among African American and white patients, but these rates did not change significantly before and after the Affordable Care Act in expansion states. Conclusion: The gap in bariatric surgery rates by insurance and income was reduced after the Affordable Care Act's Medicaid expansion, but racial disparities persisted. Future research should track these trends and identify factors to reduce racial disparity in bariatric surgery. (C) 2019 Published by Elsevier Inc.