The C&P Examiner Said “Less Likely Than Not”: How a Rebuttal Opinion Answers Back
- 1.What "Less Likely Than Not" Actually Means
- 2.Why You Only Have to Tie, Not Win
- 3.A Negative C&P Opinion Is Not the Final Word
- 4.Why a Private Opinion Can Outweigh the Examiner
- 5.The Five Weak Spots in a Negative C&P Opinion
- 6.What a Strong Rebuttal Opinion Contains
- 7.Got a "less likely than not" opinion? It can be answered.
- 8.Where to Send Your Rebuttal
- 9.Frequently Asked Questions
If your C&P examiner wrote that your condition is “less likely than not” related to your service, it usually means a denial is coming, but it is not the end of your claim. That phrase is one examiner's opinion, and VA law lets you answer it with a rebuttal medical opinion. This guide explains what “less likely than not” means, why you do not have to prove your case beyond doubt, and how a well-built rebuttal opinion answers back.
What "Less Likely Than Not" Actually Means
C&P examiners write their opinions using a set scale of phrases. Each one is really a statement about probability, or odds:
How C&P opinion language maps to the odds
What the examiner writes | What it means | Result |
|---|---|---|
More likely than not | Greater than 50% chance it is related to service | Favorable |
At least as likely as not | About a 50/50 chance (or better) | Favorable |
Less likely than not | Less than a 50% chance it is related to service | Denial |
So “less likely than not” means the examiner put the odds below 50%. Because the VA grants a claim when the odds are at least even, that phrase usually leads to a denial of service connection. The good news is in the next section: the bar is lower than most veterans think.
Why You Only Have to Tie, Not Win
This is the single most important thing to understand, and it is written into the law. You do not have to prove your claim beyond doubt. You do not even have to prove it is “more likely than not.” You only have to get the evidence to an even balance.
THE BENEFIT OF THE DOUBT RULE
When the positive and negative evidence are about equal, the tie goes to you. This is the benefit of the doubt rule, found at 38 U.S.C. 5107(b) and 38 C.F.R. 3.102.
Here is why that matters after a negative C&P exam. Right now, the record has one opinion against you. A solid, well-reasoned opinion in your favor can create a genuine conflict, an even balance. When the evidence sits in that even balance, the benefit of the doubt is supposed to go to you. Your rebuttal opinion does not have to be stronger than the C&P opinion. It has to be well-reasoned enough to bring the evidence into balance.
A Negative C&P Opinion Is Not the Final Word
A C&P opinion is evidence, but it is not a verdict. It is one medical opinion that the VA weighs against the rest of your file. You are allowed to add your own medical opinion, often called a rebuttal opinion, a private nexus opinion, or an Independent Medical Opinion (IMO). When you do, the VA has to weigh both.
And here is the part that surprises people: the VA examiner does not automatically win that weighing contest just because they work for the VA.
Why a Private Opinion Can Outweigh the Examiner
The value of any medical opinion comes from its reasoning, not from who signed it. The Court of Appeals for Veterans Claims said it plainly: most of the probative value of a medical opinion comes from its reasoning (Nieves-Rodriguez v. Peake, 22 Vet. App. 295, 304 (2008)).
That same case rejected the idea that a private doctor's opinion is automatically weaker just because the doctor did not read your whole VA claims file. What matters is whether the doctor knew the important facts and explained the reasoning. A private opinion built on the right facts and sound reasoning can carry as much weight as the C&P opinion, or more.
In Plain Terms:
A short, unexplained C&P opinion is not a strong opinion, no matter who wrote it. A clear, well-reasoned private opinion can beat it.
The Five Weak Spots in a Negative C&P Opinion
Negative C&P opinions tend to fail in the same few ways. A good rebuttal names the specific weakness and answers it. Here are the five most common.
Common flaws in a negative C&P opinion, and the rule that answers each
The weak spot | Why it is a problem |
|---|---|
No rationale | A one-sentence “less likely than not” with no reasoning is not a valid opinion. An opinion must connect its conclusion to the facts with real analysis (Stefl v. Nicholson, 21 Vet. App. 120, 124 (2007); Nieves-Rodriguez, 22 Vet. App. at 304). |
Wrong facts | If the opinion is built on a fact that is not true (a wrong date, a missed diagnosis, an event the examiner overlooked), it has no probative value (Reonal v. Brown, 5 Vet. App. 458, 461 (1993)). |
Relied on "no records" | Examiners often say your condition is not related because there is nothing in your service records. But the absence of an in-service record does not, by itself, defeat your claim (Buchanan v. Nicholson, 451 F.3d 1331, 1336 (Fed. Cir. 2006)). |
Ignored your statements | Your own account, and buddy or family statements, are evidence. An opinion that brushes them aside, or treats them as worthless because they are not in a chart, is flawed (Buchanan, 451 F.3d at 1336). |
Used the wrong standard | Some opinions read as if they demand proof beyond doubt. The legal question is only whether it is at least as likely as not, about 50/50. Holding you to a higher bar is an error. |
You do not need all five. Even one clear flaw can be enough to weaken the C&P opinion and open the door for your evidence.
What a Strong Rebuttal Opinion Contains
A rebuttal opinion is not just a second doctor saying “I disagree.” It is a focused document that does specific work. A strong one:
Reads the C&P opinion first and names exactly where it went wrong (no rationale, wrong facts, relied on missing records, and so on).
States the correct facts from your records, your service history, and your own account, so the opinion rests on an accurate picture.
Gives real reasoning, not a bare conclusion. It walks through why your condition connects to service, step by step.
Cites medical support where a mechanism is involved, so the reasoning is backed by more than opinion.
Uses the correct standard, stating the opinion as “at least as likely as not,” which is the language VA law runs on.
Considers your lay and buddy statements instead of ignoring them.
Done well, this turns a one-sided record into an even one, and an even record is a winning record under the benefit of the doubt rule.
Got a "less likely than not" opinion? It can be answered.
A clinician-written rebuttal opinion that names the flaw in the C&P exam, states the right facts, and gives sound reasoning is what turns a denial into a genuine, winnable conflict. Here is what the evidence needs to show, and why.
Where to Send Your Rebuttal
A rebuttal opinion is new evidence, and that matters, because not every review lane accepts new evidence. Here is how it lines up:
Before a decision: if you had the exam but the VA has not decided yet, you can submit the rebuttal right away so it is weighed before the decision.
After a denial, with a Supplemental Claim: this is the main lane for new evidence. A Supplemental Claim (VA Form 20-0995) lets you add the rebuttal as “new and relevant” evidence, and a reviewer decides whether it changes the outcome.
After a denial, with a Board Appeal: if you appeal to the Board (VA Form 10182), the Evidence Submission or Hearing docket also lets you add new evidence like a rebuttal. The Direct Review docket does not.
Not with a Higher-Level Review: an HLR does not accept new evidence at all. It is for arguing that the VA made an error on the evidence it already had. So it is the wrong lane for a rebuttal. If you have one to submit, use a Supplemental Claim or a Board Appeal (Evidence Submission or Hearing).
Protect your effective date: for a Supplemental Claim, filing within one year of the decision generally protects your back pay date. For a Higher-Level Review or Board Appeal, one year from the decision is the deadline to use those lanes at all. Either way, do not sit on a denial.
A short conversation about your specific denial letter is usually enough to point you to the right lane.
Frequently Asked Questions
What does less likely than not mean on a C&P exam?
It is the examiner's way of saying there is less than a 50% chance your condition is connected to your service. Because the VA grants a claim when the odds are at least 50/50, a less likely than not opinion usually leads to a denial. But it is only one opinion, and it can be answered.
Can I fight a negative C&P exam opinion?
Yes. It is not the final word. You can submit a rebuttal medical opinion (a private nexus opinion or IMO) that points out the flaws in the C&P opinion and gives a well-reasoned opinion in your favor. Under Nieves-Rodriguez v. Peake, a well-reasoned private opinion can carry as much or more weight than the C&P opinion.
Do I have to prove my claim beyond doubt?
No. You only have to show the evidence is at least evenly balanced. Under 38 U.S.C. 5107(b) and 38 C.F.R. 3.102, when the positive and negative evidence are about equal, the benefit of the doubt goes to you. A strong rebuttal that creates a genuine tie can be enough.
Why would a private opinion outweigh the VA examiner?
Because the value of a medical opinion comes from its reasoning, not from who wrote it. If the C&P opinion is a bare conclusion, is based on wrong facts, or relies only on missing records, a private opinion with sound reasoning can outweigh it.
What are the most common flaws in a negative C&P opinion?
No rationale, wrong facts, relying on the absence of in-service records, ignoring your lay and buddy statements, and demanding certainty instead of the 50/50 standard. Each of these can be answered in a rebuttal opinion.
References
Nieves-Rodriguez v. Peake, 22 Vet. App. 295, 304 (2008) (probative value of a medical opinion comes from its reasoning; claims-file review not mandatory for a private opinion).
Stefl v. Nicholson, 21 Vet. App. 120, 124 (2007) (an opinion must connect its conclusion to the facts with a reasoned analysis).
Reonal v. Brown, 5 Vet. App. 458, 461 (1993) (an opinion based on an inaccurate factual premise has no probative value).
Buchanan v. Nicholson, 451 F.3d 1331, 1336 (Fed. Cir. 2006) (the absence of contemporaneous records does not, by itself, render lay evidence not credible).
38 U.S.C. 5107(b); 38 C.F.R. 3.102 (benefit of the doubt when the evidence is in approximate balance).
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Get Free ConsultationDr. Kishan Bhalani is a subject matter expert on VA disability claims documentation, with more than five years of focused work at the intersection of clinical m…
Dr. Kishan Bhalani is a subject matter expert on VA disability claims documentation, with more than five years of focused work at the intersection of clinical m…
Originally published July 9, 2026 • Last updated July 9, 2026
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About this article. This post is general educational and medical information published by the Military Disability Nexus clinical team. It is not legal advice, not individualized medical advice, and not a substitute for a personal evaluation by a licensed clinician or a consultation with an accredited representative. Reading it does not create a doctor-patient or attorney-client relationship. VA law and rating criteria change; some details may not reflect the most recent updates, and every claim is decided by the VA on its own facts – no outcome is promised or guaranteed. Military Disability Nexus is an independent medical-evidence provider and is not affiliated with, endorsed by, or acting on behalf of the U.S. Department of Veterans Affairs or any government agency. Free claims assistance is available from VA-accredited Veterans Service Organizations and county Veterans Service Officers; you can verify any representative's accreditation through the VA Office of General Counsel.