ANSI X12 837P - 4010 2310E REF - Supervising Provider Secondary Identification
The 2310E REF Subscriber Supervising Provider Identification Segment is required when a secondary number is necessary to identify the provider.
The 4010 specifications for the REF segment can be found below as it pertains to the 2310E loop.
Sample 837P (4010) - 2310E REF - Supervising Provider Secondary Identification
- Supervising Provider Secondary Identification (2310E)
HIPAA Guide - 837P 
|R||REF||01||Reference Identification Qualifier||M||ID||3||
[Supervising Provider Secondary Identifier]
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