LAUSR

BACKGROUND Despite their higher incidence of colorectal cancer, ethnoracial minority and low-income patients have reduced access to elective colorectal cancer surgery. Although the Affordable Care Act's Medicaid expansion increased screening colonoscopies, its effect on disparities in elective colorectal cancer surgery remains unknown. OBJECTIVE This study assessed the effects of Medicaid expansion on elective colorectal cancer surgery rates overall and by race-ethnicity and income. DESIGN Using the 2012-2015 State Inpatient Databases, a retrospective cohort study was conducted. SETTINGS State Inpatient Databases from three expansion (Maryland, New Jersey, Kentucky) and two non-expansion states (Florida, North Carolina) were used. PATIENTS This study examined 22,304 adult patients aged 18-64 who underwent colorectal cancer surgery. MAIN OUTCOME Using interrupted time series analysis, the effect of Medicaid expansion on the odds of elective colorectal cancer surgery was assessed. RESULTS Elective vs. non-elective surgery rates remained unchanged overall (70.2% vs 70.7%, p = 0.63) and in ethnoracial minorities in expansion states (whites from 72.8% to 73.8% pre to post, p = 0.40 and non-white from 64.0% to 63.1% pre to post, p = 0.67). There was an instantaneous increase in odds of elective surgery in expansion vs. non-expansion states at policy implementation (adjusted OR 1.37, 95% CI, 1.05-1.79, p = 0.02), but it subsequently decreased (combined adjusted OR 0.95, 95% CI, 0.92-0.99, p = 0.03). Elective surgery rates were also unchanged among ethnoracial minorities (instantaneous changes in expansion states, combined effect 1.06; pre-trend 1.01 vs. post trend 0.98) and low-income persons in expansion states (pre trend 1.03 vs. post-trend 0.97) (for all, p > 0.1). LIMITATIONS The study was limited to 5 states. While patients may have increased access to cancer screening services and surgery post-expansion, the State Inpatient Database only provides information on patients who underwent surgery. CONCLUSIONS Despite gains in screening, Medicaid expansion was not associated with reductions in known ethnoracial or income-based disparities in elective colorectal cancer surgery rates. Expanding access to colorectal cancer surgery for underserved populations likely requires attention to provider and health system factors contributing to persistent disparities.