Association of Medicaid expansion of the Affordable Care Act with operations for benign endocrine surgical disease

Published:October 25, 2022DOI:


      • The ACA increased Medicaid coverage for benign endocrine surgical procedures.
      • Medicaid Expansion states had lower rates of uninsured patients.
      • Medicaid patients have increased odds of undergoing thyroid operations.
      • Medicaid patients have lower odds of undergoing parathyroid or adrenal operations.


      Background: The Affordable Care Act's Medicaid expansion increased insurance coverage and access to care for endocrine cancers, though impact on benign endocrine disease is unknown.
      Methods: Patients undergoing operations for benign thyroid, parathyroid, and adrenal disease were collected from the Vizient® Clinical Data Base from 2009 to 2016 and grouped by state Medicaid expansion status in January 2014. Insurance coverage was analyzed by difference-in-differences analysis, and logistic regression evaluated odds of operation by insurance status.
      Results: 134,242 patients were included. Medicaid coverage in expansion states increased for all operations (Adj-DD 5.78%, p < 0.001) with decreases in uninsured and private insurance. Medicaid patients had increased odds of undergoing thyroid operations (OR 1.56, p < 0.001) and decreased odds of parathyroid (OR 0.68, p < 0.001) or adrenal operations (OR 0.70, p < 0.001) versus private insurance.
      Conclusion: Medicaid expansion increased insurance coverage for benign endocrine disease, however, barriers remain for Medicaid patients with parathyroid and adrenal disease.



      ME (Medicaid expansion), ACA (Affordable Care Act), DD (Difference-in-differences), Adj (Adjusted), ICD (International Classification of Diseases)
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