We sought to understand how Affordable Care Act (ACA) Medicaid expansion insurance coverage gains are associated with changes in diabetes-related biomarkers.
RESEARCH DESIGN AND METHODSThis was a retrospective observational cohort study using electronic health record data from 178 community health centers (CHCs) in the ADVANCE (Accelerating Data Value Across a National Community Health Center Network) network. We assessed changes in diabetes-related biomarkers among adult patients with diabetes in 10 Medicaid expansion states (n 5 25,279), comparing newly insured with continuously insured, discontinuously insured, and continuously uninsured patients pre-to post-ACA expansion. Primary outcomes included changes from 24 months pre-to 24 months post-ACA in glycosylated hemoglobin (HbA 1c ), systolic (SBP) and diastolic (DBP) blood pressure, and LDL cholesterol levels.
RESULTSNewly insured patients exhibited a reduction in adjusted mean HbA 1c levels (8.24% [67 mmol/mol] to 8.17% [66 mmol/mol]), which was significantly different from continuously uninsured patients, whose HbA 1c levels increased (8.12% [65 mmol/ mol] to 8.29% [67 mmol/mol]; difference-in-differences [DID] 20.24%; P < 0.001). Newly insured patients showed greater reductions than continuously uninsured patients in adjusted mean SBP (DID 21.8 mmHg; P < 0.001), DBP (DID 21.0 mmHg; P < 0.001), and LDL (DID 23.3 mg/dL; P < 0.001). Among patients with elevated HbA 1c in the 3 months prior to expansion, newly insured patients were more likely than continuously uninsured patients to have a controlled HbA 1c measurement by 24 months post-ACA (hazard ratio 1.25; 95% CI 1.02-1.54].
CONCLUSIONSPost-ACA, newly insured patients had greater improvements in diabetes-related biomarkers than continuously uninsured, discontinuously insured, or continuously insured patients. Findings suggest that health insurance gain via ACA facilitates access to appropriate diabetes care, leading to improvements in diabetes-related biomarkers.Diabetes is a leading cause of morbidity and mortality in the U.S. (1,2). Secondary preventive services for patients with diabetes, such as screening for and addressing glycosylated hemoglobin (HbA 1c ) and lipid levels, limit complications and improve health outcomes (3-5). Uninsured patients have higher average HbA 1c levels than do those with health insurance ( 4) and yet are less likely to receive secondary prevention (6-8). Prior research showed that even when uninsured patients with diabetes visited community health centers (CHCs), "safety net" clinics that provide care regardless of patients' ability