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This variable is contained in the following files:
SAS Name
OP_PHYSN_UPIN
On an institutional claim, the unique physician identification number (UPIN) of the physician who performed the principal procedure. This element is used by the provider to identify the operating physician who performed the surgical procedure.
NPIs replaced UPINs as the standard provider identifiers beginning in 2007. The UPIN is almost never populated after 2009.
Source: NCH