When you meet with your VA MSC you will have the option of choosing the specific issues you want the VA to re-evaluate, in particular, what the Army has deemed as unfitting.
In the IDES process, you do not have to have every issue you are currently rated for through the VA re-evaluated.
It does behoove you to have the MEB medical doctor take a closer look at your records if you have supporting documentation for other unfitting conditions that may not be on your documentation that initiated your MEB. If there is enough documentation supporting those conditions, they can add them.
If you have any questions, feel free to PM me.
Leo