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This variable is contained in the following files:
SAS Name
RFR_PHYSN_UPIN
The unique physician identification number (UPIN) of the physician who referred the beneficiary or the physician who ordered the Part B services or durable medical equipment (DME).
NPIs replaced UPINs as the standard provider identifiers beginning in 2007. The UPIN is almost never populated after 2009.
Source: NCH