Cover Page to go with my files for Insurance

i am ready to send my medical records to the insurance company but I understand that it is a good thing to send a cover sheet with it.  I'm not sure what to say on it. WLS.  I see where some have said things about putting codes on the letters but I don't know why or what it will do for me.  Any help would be greatly appreciated. I will be a revision from band to DS.

I didnt have a revision but in my RNY request I sent a letter. Its on my profile page.