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The Physician Registry was established by the Health Care Financing Administration (HCFA) for the purposes of issuing unique physician identification numbers (UPINs) to the following Medicare providers: doctors of medicine, osteopathy, dental medicine, dental surgery, podiatry, optometry, and chiropractors. The Registry collects basic professional information in order to uniquely identify individual practitioners. To assist HCFA, Registry personnel, and the Medicare contractors in monitoring and cleaning up data submitted to the Registry, an integrated series of computer programs was developed. These programs create a comprehensive data file incorporating data quality flags, and a second file identifying cases in which more than one UPIN may have been assigned. The first file, the UPIN Integrity File, is also the input file for a record-specific error report showing data elements requiring correction. The second file, the Multiple-UPIN File, yields a report about each potential case of multiple-UPIN assignment. In addition to Medicare and its contractors, researchers should find the programs and output files useful for quickly assessing Registry data quality. This document describes the programs that produce both the data files and the reports.