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This variable is contained in the following files: Carrier (Fee-for-Service)
Short SAS Name
SAS Name

The unique physician identification number (UPIN) of the physician who performed the service for this line item on the carrier claim (non-DMERC).

NPIs replaced UPINs as the standard provider identifiers beginning in 2007. The UPIN is almost never populated after 2009.

Source: NCH