In a clinical/medical context, "in the interim" means "in the meantime" or "during the time between two events."
In the slide you've shared, it refers to the period between when the patient was first seen/diagnosed elsewhere and when she arrived at this institution for further evaluation.
So the sentence means:
During the time between her previous care and this current visit, the patient coordinated with her insurance provider and was then advised to come here for further evaluation and management.
Simple breakdown:
Interim = the gap/period between two points in time
"In the interim" = during that gap/period = "meanwhile" / "in the meantime"
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