@craigappl, I'm no expert, but I believe you will want to inspect / alter the following tables;
- metadatamapping_metadata_set (Should contain an emrapi module source)
- metadatamapping_metadata_set_member (Should contain a term for the emrapi source with code = "emr.extraPatientIdentifierTypes")
- metadatamapping_metadata_source (Should contain a set that the above term member points to)
- metadatamapping_metadata_term_member (Should contain look-ups for the various patient identifier types to include)
Hope this points you in the right direction.
To populate this, you can likely take the direct SQL approach, or you can set these up using the API in the metadatamapping module.