Validity of Using Inpatient and Outpatient Administrative Codes to Identify Acute Venous Thromboembolism

Background: Administrative data are frequently used to identify venous thromboembolism (VTE) for research and quality reporting. However, the validity of these codes, particularly in outpatients, has not been well-established. Objective: To determine how well International Classification of Diseases, Ninth Revision (ICD-9) codes for VTE predict chart-confirmed acute VTE in inpatient and outpatients. Patients and Methods: We selected 4642 adults...