RESULTS
Of the 718 articles initially identified within the comprehensive search, 17 studies utilized original CPs to identify TG patients within electronic healthcare databases (Figure 1 ).6,8–23 Twelve of these studies were able to validate or enhance the positive predictive value of their CP through manual chart reviews (n=5), hierarchy of code mechanisms (n=4), key text-strings (n=2), or self-surveys (n=1). Of these twelve studies, three used administrative claims data and nine used electronic health record (EHR) data. Claims data contains claims information on patient utilization of prescription fills and medical services for the purposes of documenting administrative and healthcare billing reimbursement, while EHR data are medical charts in a digitized format and recorded by providers for the purposes of patient clinical care.24–26