Development of a Natural Language Processing Algorithm to Identify and Evaluate Transgender Patients in Electronic Health Record Systems.

<bold>Objective: </bold>To create a natural language processing (NLP) algorithm to identify transgender patients in electronic health records.<bold>Design: </bold>We developed an NLP algorithm to identify patients (keyword + billing codes). Patients were manually reviewed, and their health care services categorized by billing code.<bold>Setting: </bold>Vanderbilt University Medical Center.<bold>Participants: </bold>234 adult and pediatric transgender patients.<bold>Main Outcome Measures: </bold>Number of transgender patients correctly identified and categorization of health services utilized.<bold>Results: </bold>We identified 234 transgender patients of whom 50% had a diagnosed mental health condition, 14% were living with HIV, and 7% had diabetes. Largely driven by hormone use, nearly half of patients attended the Endocrinology/Diabetes/Metabolism clinic. Many patients also attended the Psychiatry, HIV, and/or Obstetrics/Gynecology clinics. The false positive rate of our algorithm was 3%.<bold>Conclusions: </bold>Our novel algorithm correctly identified transgender patients and provided important insights into health care utilization among this marginalized population. [ABSTRACT FROM AUTHOR]