@jbrav123, it is a pleasure to comment on this post. If I understand you correctly you originally filed the claim for migraines in 2018 and like so many of us it was denied. Unfortunately the claim will not backdate to 2018 because you did not file an appeal of that decision within the year threshold. However, you did refile the claim (Supplemental) and got the claim reopened therefore October 20, 2020, would be the effective date of this particular claim. So to recap if you had filed an appeal for the initial claim (2018) and continuously fought this claim, then you could file an HLR for the effective date. For once VA is correct