Clear and Unmistakable Error: How to Challenge an Old VA Decision Under 38 CFR § 3.105

What Is Clear and Unmistakable Error?

Most veterans know about the standard appeal lanes under the Appeals Modernization Act — Supplemental Claims, Higher-Level Reviews, and Board appeals. But there is another path that gets far less attention: Clear and Unmistakable Error, or CUE. This is not a standard appeal. It is a direct challenge to a final VA decision, and if you win, the correction goes back to the original decision date. That can mean years of back pay.

CUE is governed by 38 CFR § 3.105(a). The regulation states that a final and binding VA decision can be reversed or amended if it was based on clear and unmistakable error. The bar is high, but for veterans who were shortchanged by a bad decision years or even decades ago, it is worth understanding.

What Qualifies as CUE

Not every mistake the VA makes qualifies as CUE. To succeed, you must show all three of the following:

• The VA applied the wrong law or regulation, or got the facts wrong in a way that was undebatable at the time of the original decision.
• The error was outcome-determinative — meaning the decision would have been different without it.
• The error was clear and unmistakable, not just a disagreement with how the VA weighed the evidence.

That third point trips up a lot of veterans. If the VA looked at the evidence and made a judgment call you disagree with, that is not CUE. CUE requires an error that is undebatable — something obviously wrong under the law or regulations in effect at the time the decision was made.

Common Examples of CUE

Here are the types of errors that have been found to constitute CUE:

• Wrong diagnostic code applied: The VA rated your condition under the wrong code in 38 CFR Part 4, producing a lower rating than the correct code would have.
• Failure to apply the benefit of the doubt: Under 38 CFR § 3.102, when evidence is in approximate balance, the VA must resolve it in the veteran’s favor. Ignoring this rule when evidence was genuinely in equipoise can be CUE.
• Ignoring an applicable presumptive regulation: If a presumptive regulation applied to your condition at the time and the VA did not apply it, that is a legal error that may qualify.
• Incorrect effective date based on a clear factual error: If the VA assigned the wrong effective date because it misread the date on your claim, that can be CUE under 38 CFR § 3.400.

How to File a CUE Claim

File on VA Form 20-0995 (Supplemental Claim) for regional office decisions, or directly to the Board of Veterans Appeals for Board decisions. Identify the specific decision by date and state exactly what the error was and why it was outcome-determinative.

Vague allegations will not work. Point to the specific regulation or law that was violated and explain how the outcome would have been different. There is no time limit — a decision from 1985 can still be challenged today. But once a CUE claim on a specific decision is denied, you generally cannot re-litigate the same CUE theory on that same decision. Get it right the first time.

If you are building a CUE argument, The Appeals Playbook covers the legal standards and how to structure your argument in a way the VA and the Board will take seriously. You can also use the free VA claim tools on this site to pull together the documentation you need before you file.

What Happens If You Win

Under 38 CFR § 3.105(a), if the VA finds CUE, the corrected decision is effective from the date of the original erroneous decision. If the VA wrongly denied your 60% rating in 2008 and you prove CUE in 2025, you are entitled to back pay going back to 2008 — not just from the date you filed the CUE claim. That retroactive effective date is what separates CUE from a Supplemental Claim, which ties your effective date to when you filed new evidence.

CUE vs. Other Appeal Options

Before going the CUE route, make sure it is the right tool. CUE is for final decisions where the standard appeal window has closed. If you are still within the one-year window after a VA decision, a Higher-Level Review or Board appeal does not require meeting the high CUE standard and is almost always the better path.

CUE is also not the right path if your argument is simply that the VA got the rating wrong based on how it weighed the evidence. That is a disagreement with the outcome, not a legal or factual error. Save CUE for situations where you can point to a specific regulation the VA failed to apply or a diagnostic code it applied incorrectly. The Win Your VA Disability Claim guide walks through how to read VA decisions and identify the types of errors that can be challenged.

The Bottom Line

CUE is a narrow but powerful tool. The standard is demanding, and you need to build a specific, regulation-grounded argument. But if the VA applied the wrong law, ignored a regulation clearly in effect, or made an undebatable factual error that cost you a higher rating, CUE gives you a path to correct it — with back pay going all the way to the original decision date. Know the standard, build a tight argument, and file it right the first time.