Fig. 1.

Measures of Medicaid coverage agreement between EHR and Medicaid data, stratified by pre- and post-Affordable Care Act (ACA) periods.

Note: OCHIN health information network Epic© electronic health record (EHR) data are referred to as EHR data and Oregon Medicaid enrollment data are referred to as Medicaid data. Agreement is defined as total proportion of encounters in which EHR data denoted the same coverage status as the ‘gold standard’ (i.e., Medicaid data). PABAK adjusts kappa for differences in prevalence of the conditions and for bias between data sources. Sensitivity is the probability that EHR denoted coverage when the assumed gold standard also denoted coverage. Specificity is the probability that EHR correctly classified ‘no Medicaid coverage’ when the assumed gold standard also denotes no Medicaid coverage. PPV is the likelihood of a visit being covered by Medicaid when the gold standard denoted Medicaid coverage. NPV is the likelihood of an encounter not being covered by Medicaid when the gold standard denoted no Medicaid coverage. Data were collected in 2016 and analyzed 2017–2018.