Association of Medicaid Expansion Under the Affordable Care Act with Insurance Status and Clinical Characteristics of Low-Income Patients with Newly Diagnosed Melanoma
Importance: The Affordable Care Act expanded Medicaid eligibility in participating states to individuals with incomes up to 138% of the federal poverty line. The effects of this policy on the diagnosis and treatment of melanoma in low-income populations has yet to be described. Objective: To evaluate the effect of Medicaid expansion on changes in insurance status and clinical characteristics of low-income patients with newly diagnosed melanoma. Design, Setting, and Participants: This cross-sectional study included patients younger than 65 with a new diagnosis of malignant melanoma from January 1, 2011 to December 31, 2016, in the US National Cancer Institute's Surveillance Epidemiology and End Results database. Exposures: Residence in a state that expanded Medicaid on January 1, 2014. Main Outcomes and Measures: The primary outcomes were insurance status, melanoma staging, and overall survival. Results: In Medicaid expansion states, there were 1,719 low-income patients with newly diagnosed melanoma during the pre-expansion time period and 1,984 (15% increase) during the post-expansion time period. In nonexpansion states, there were 326 low-income patients with newly diagnosed melanoma during the pre-expansion time period, and 288 during the post-expansion time period (12% decrease). Compared with nonexpansion states, expansion states had a significantly greater reduction in percentage of uninsured patients following Medicaid expansion (adjusted odds ratio, 6.27 [95% CI, 4.83 to 8.14]). Overall survival was not statistically different between expansion and nonexpansion states (HR, 0.89 [95% CI, 0.74 to 1.06]). There were no statistically significant differences in melanoma staging at diagnosis between the expansion and nonexpansion groups (p=0.05). Conclusions and Relevance: Medicaid expansion was associated with increased melanoma diagnoses in low-income patients and a decreased proportion of uninsured patients. However, our study did not identify differences in clinical outcomes associated with Medicaid expansion.