Segment: PRV
Loop: 2000A Segment: PRV
Element: PRV01 (Billing Provider Specialty Information Provider Code)
Hard Coded to 'BI'
Element: PRV02 (Billing Provider Specialty Reference Identification Qualifier)
Hard Coded Billing Provider Information
Element: PRV03 (Billing Provider Specialty Reference Identification)

Tools->Manage Groups->Legacy ID (If ZZ-Billing Provider Taxonomy)
Element: PRV03 (Billing Provider Specialty Reference Identification)

Tools->Insurance Companies->Edit Provider->Override Group Values-Legacy ID ( If ZZ-Billing ProviderTaxonomy)