This variable is the National Provider Identifier (NPI) for the physician who rendered the services.
NPIs replaced UPINs as the standard provider identifiers beginning in 2007. The UPIN is almost never populated after 2009.
This field appears on both the revenue center and base claim files.
CMS has determined that dual provider identifiers (old legacy numbers and new NPI) must be available in the NCH. After the 5/07 NPI implementation, the standard system maintainers will add the legacy number to the claim when it is adjudicated. We will continue to receive the OSCAR provider number and any currently issued UPINs. Effective May 2007, no new UPINs (legacy numbers) will be generated for new physicians (Part B and outpatient claims), so there will only be NPIs sent in to the NCH for those physicians. Source: NCH