What is it?
Box 33a is used to indicate the National Provider Identifier number of the Billing Provider.
In Application:
By default, the system uses the information found under Admin > Member Info to populate Box 33a.
For a specific payer, please see: Box 33: Insurance Specific Billing Provider.
For a group, please see: Provider Groups
EDI File
Loop 2010AA, Segment NM109
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