Mission Medical - Proof of Coverage

I am trying to add my RM daughter to my health insurance, but I need proof of prior coverage from Mission Medical in order for that to happen. Does anyone know how I do that? I haven't been able to find a way to contact Mission Medical directly. Any ideas? I need to get it done soon.

I am not sure if this is what you need, but this is one phone number for the plan sponsor:
800-777-1647

Here's a page with additional contact info for Missionary Medical, which is done through DMBA:
https://www.dmba.com/sc/missionarymedic ... actUs.aspx