What Supplemental Claim is for
A Supplemental Claim is generally the lane to use when you have new and relevant evidence after a VA decision.
Evidence to organize
New treatment records, private medical records, lay statements, service records, or corrected facts may matter when they address the reason VA denied or underrated the issue.
Preparation notes
Compare the denial reasons against your new evidence. Keep unsupported assumptions separate from documented facts and consider help from an accredited VSO or attorney.