Also, I need to find out a claim. Do you have information on how to get an opinion from a senior reviewer?
A senior reviewer will take another look at your case and determine whether the decision can be changed based on a difference of opinion or an error.
is that the higher level review I heard about or is that different?
Yes, in a Higher-Level Review you are asking for another review of the same evidence, and a senior reviewer will take another look at your case.