Christopher J Dy1, Derek S Brown2, Hera Maryam3, Matthew R Keller4, Margaret A Olsen5. 1. Division of Hand and Microsurgery, Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, MO; Division of Public Health Sciences, Department of Surgery, Washington University School of Medicine, St. Louis, MO. 2. George Warren Brown School of Social Work, Washington University in St. Louis, St. Louis, MO. 3. Division of Hand and Microsurgery, Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, MO. 4. Division of Infectious Diseases, Department of Medicine, Center for Administrative Data Research, Washington University School of Medicine, St. Louis, MO. 5. Division of Public Health Sciences, Department of Surgery, Washington University School of Medicine, St. Louis, MO; Division of Infectious Diseases, Department of Medicine, Center for Administrative Data Research, Washington University School of Medicine, St. Louis, MO.
Abstract
BACKGROUND: Although Medicaid expansion has improved access to primary care services, its impact on surgical specialty utilization remains unclear. The aim of this study is to determine whether Medicaid expansion is associated with increased utilization rates of total hip arthroplasty (THA) and total knee arthroplasty (TKA) in Illinois (which expanded Medicaid) relative to Missouri (which did not expand Medicaid). METHODS: Using administrative data sources, we analyzed 374,877 total hospitalizations (236,333 in Illinois and 138,544 in Missouri) for THA/TKA from 2011 to 2016 (Illinois' Medicaid expansion date: January 1, 2014). RESULTS: The percentage of THA/TKA funded by Medicaid in Illinois was 2.4% in 2013 and 3.9% in 2016 (Missouri 2013: 2.7%; 2016: 2.6%). A difference-in-difference analysis (adjusted for patient age and gender, county-level Area Deprivation Index, and number of orthopedic surgeons) demonstrated a statistically significant increase in Medicaid-funded THA/TKA in Illinois in 2016 compared to 2013 (P = .012). CONCLUSION: Our study demonstrates that Medicaid expansion in Illinois was associated with increased utilization of THA and TKA. Further study is needed to understand the impact of Medicaid expansion in other states and for other procedures.
BACKGROUND: Although Medicaid expansion has improved access to primary care services, its impact on surgical specialty utilization remains unclear. The aim of this study is to determine whether Medicaid expansion is associated with increased utilization rates of total hip arthroplasty (THA) and total knee arthroplasty (TKA) in Illinois (which expanded Medicaid) relative to Missouri (which did not expand Medicaid). METHODS: Using administrative data sources, we analyzed 374,877 total hospitalizations (236,333 in Illinois and 138,544 in Missouri) for THA/TKA from 2011 to 2016 (Illinois' Medicaid expansion date: January 1, 2014). RESULTS: The percentage of THA/TKA funded by Medicaid in Illinois was 2.4% in 2013 and 3.9% in 2016 (Missouri 2013: 2.7%; 2016: 2.6%). A difference-in-difference analysis (adjusted for patient age and gender, county-level Area Deprivation Index, and number of orthopedic surgeons) demonstrated a statistically significant increase in Medicaid-funded THA/TKA in Illinois in 2016 compared to 2013 (P = .012). CONCLUSION: Our study demonstrates that Medicaid expansion in Illinois was associated with increased utilization of THA and TKA. Further study is needed to understand the impact of Medicaid expansion in other states and for other procedures.
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