A denial is not the end of a VA claim, and neither is a rating you believe is wrong. Since 2019 the VA has offered three lanes for disagreeing with a decision, and the Supplemental Claim is the lane built for one specific situation: you have evidence the VA did not see. This guide covers that lane in depth. For how it compares against the other two, Higher-Level Review and a Board Appeal, start with your options after a VA decision. As always on this site, this is how the system works, not advice on which lane to take; that decision is what a free accredited VSO is for.
What a Supplemental Claim is
A Supplemental Claim asks the VA to decide the issue again with something added. It is not an argument that the first reviewer erred with the evidence in hand; that is Higher-Level Review's job. It is the lane for "here is what you did not have." It is filed on VA Form 20-0995, and of the three lanes it is the only one where new evidence is part of the design.
You can file a Supplemental Claim after an initial decision, after a Higher-Level Review, or after a Board decision. The lanes can be used in sequence, and the one-year clock resets with each new decision.
"New and relevant," in plain words
The standard has two halves, and both matter:
- New means the VA did not have it when it decided. A record that was already in the file does not become new by being pointed at again.
- Relevant means it tends to prove or disprove something the claim actually turns on. Your decision letter is the map here: the evidence and reasons sections state what the VA found missing, and relevant evidence is evidence aimed at exactly that gap.
In practice, new and relevant evidence looks like: treatment records from a provider the VA never contacted, a diagnosis made after the decision, a medical opinion connecting a condition to service or to a service-connected condition, or written statements from people with direct knowledge, in service or since. It does not need to guarantee a different outcome; it needs to bear on the question.
The one-year window
You can file a Supplemental Claim at any time, but the calendar is not neutral. File within one year of the decision date and the claim continues the original one: if it is granted, payment is calculated from the original effective date, which can mean substantial back pay. File after the year has passed and the claim is still heard, but the effective date is generally tied to the new filing instead.
The mechanics of what an effective date is worth are covered in the back pay calculator, and the VA's own rules are on its effective date page. The practical takeaway is unglamorous: know your decision's date, and if you are going to file, know where you stand against that one-year mark.
The duty to assist
In a Supplemental Claim, the VA's duty to assist applies: identify evidence, and the VA is required to make reasonable efforts to get it. Name the clinic, the hospital, the VA facility, and roughly when you were treated, and requesting those records becomes the VA's job. This is unique among the three lanes; Higher-Level Review and the Board's direct-review docket look only at what is already in the file.
The duty to assist is help, not magic. The VA can only chase records you identify, which means the veteran who knows where every record lives files a stronger claim than the one guessing. That inventory, who treated you, where, and when, is exactly the kind of thing worth keeping organized before you need it.
The PACT Act connection
The PACT Act added conditions to the VA's presumptive lists, which changed the ground under some old denials. If a condition was denied years ago and later became presumptive, the VA's own guidance points to the Supplemental Claim as the way to ask again. The claim benefits from the new presumption even though the original decision predates it. What the PACT Act covers, and what presumptive actually means, is laid out in our PACT Act section and on the VA's PACT Act page.
How to file
The form is VA Form 20-0995, and it can be filed online at VA.gov, by mail, in person at a regional office, or through an accredited representative. The form asks which decision you are disagreeing with, which issues, and what the new evidence is: either attached directly or identified for the VA to obtain under the duty to assist.
A VSO can prepare and file the whole thing with you, for free, and this is a lane where that help earns its keep: matching evidence to the gaps a decision letter named is precisely their training. Walk in with the letter, the new evidence, and your records inventory, and the meeting does real work; see what to bring to your first VSO meeting.
What happens after
The VA reviews the issue again with the new evidence, may schedule a C&P exam if one is needed, and issues a new decision letter. The VA posts its current average processing time for Supplemental Claims on its Supplemental Claim page. If the new decision still is not right, the three lanes are open again, and a new one-year clock starts from the new decision date.
Where the evidence lives until then
Every Supplemental Claim starts with a veteran who can say "here is what the VA has not seen, and here is where it came from." That is a filing-cabinet problem before it is a legal one. MusterVault keeps your decision letters, medical records, and dated symptom journal encrypted on your own computer and organized by category, so when the day comes to fill the evidence gap, you are searching one place instead of three portals and a shoebox. We organize; your VSO advises.