Implementation of insurance marketplaces and changes in diagnosis stage in low-income cancer patients.

Abstract

1576 Background: Millions of low-income Americans gained insurance coverage through Medicaid expansion and the “Marketplaces” of the Affordable Care Act (ACA). How Marketplaces have specifically improved cancer outcomes among these individuals is unclear. Thus, we examined changes in insurance status and diagnosis stage following the ACA among low-income (139-250% of the Federal Poverty Level [FPL]), non-elderly patients (ages 30-64). Methods: In Ohio’s cancer registry, we identified patients diagnosed with one of the top 16 cancers before (2011-2013, “Pre-ACA”) and after (Q3 of 2014-2016, “Post-ACA”) the implementation of the ACA’s insurance Marketplaces and either had private insurance or no insurance. Low-income patients were isolated using a novel, geographically-driven approach called probability weighting. Results: The uninsured percentage dropped from 12.9% to 4.9% between the Pre- and Post-ACA periods in the study sample (N = 10,747). An estimated 11.1% of individuals had Marketplace insurance Post-ACA. A significant but modest Post-ACA (versus Pre-ACA) shift toward non-metastatic disease was identified (Adjusted Odds Ratio [AOR]: 0.95, 95%CI: 0.90-0.99). The largest site-specific shifts were observed for thyroid (AOR: 0.50, 95%CI: 0.30-0.83) and ovarian (AOR: 0.74, 95%CI: 0.58-0.93) cancers. In a control analysis of wealthier (400%+ FPL), privately insured individuals, no significant shifts were identified (AOR: 0.97, 95%CI: 0.92-1.02). Conclusions: This is the first study to show an effect in cancer stage at diagnosis from the Affordable Care Act’s Insurance Marketplaces. We found that the Marketplaces greatly reduced the number of low-income, uninsured cancer patients, translating to significant improvements in cancer stage at diagnosis. As policy makers contemplate modifications to the ACA, they should carefully consider the impact of those changes on the highly vulnerable population of low-income cancer patients.