Establishment of Usual Care Providers Health Care Financing Administration Current Procedural Terminology (CPT) evaluation and management codes 99201 to 99205 (new patient) and 99221 to 99215 (established patient) were used to establish outpatient visits. Individual providers were determined using the Uniqu...
Data on all patients admitted to BWH or MGH between November 3, 1997, and December 30, 2011, were obtained through the Research Patient Data Registry (RPDR), a computerized registry which serves as a central data warehouse for all inpatient and outpatient records at BWH and MGH [7]. For ...