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Background Electronic health record (EHR) data is increasingly used to identify patients with chronic kidney disease (CKD). EHR queries used to capture CKD status, identify comorbid conditions, measure awareness by providers, and track adherence to guideline-concordant processes of care have not been validated. Methods We extracted EHR data for primary-care patients with two eGFRcreat 15-59 mL/min/1...