It is important to know who is covered and the dependents they have listed. Insurance plan policies for expats in particular can be complicated as countries, conditions and travel can affect if a plan is applicable to you. You need to know what you are covered for and how long you are covered for.
If you travel regularly and require a plan meets your needs you will need to know where you are covered. If you have a group plan you need to know if all intended are accounted for and who is the policy holder for the plan whose name will show up on all plan documents.