A unique physician identification number, or UPIN, is an identifier that was used to identify physicians and health care professionals who enrolled in Medicare, according to the Research Data Assistance Center. UPINs identify the medical personnel who ordered or referred a service pursuant to a Medicare claim.
A UPIN identifier contains information regarding individual physicians and those who are part of a group practice, notes the Research Data Assistance Center. It includes several elements, including full name, specialty, physician license state code, ZIP code, billing number of the Medicare provider and state. While the Centers for Medicare & Medicaid Services previously administered the UPIN system as part of its record keeping process, the UPIN system was replaced in 2007 with the National Provider Identifier system.