VA Denials · Article
How to read a VA denial letter — and what “no nexus” really means
Your denial letter is written in code. Here's how to decode it, using a real-world style sleep apnea secondary to PTSD denial as an example — so you know exactly what the VA is telling you, and what to do next.
Brightview Psychiatry Solutions
Reviewed by Dr. Jessica Allen, M.D., former VA C&P examiner · 7 min read
The short version
If your denial letter says the evidence doesn't show “a link,” that your condition is “less likely than not” related to service, or that it isn't “proximately due to” a service-connected condition — that's a “no nexus” denial. It means the VA didn't find the medical connection proven. The good news: it's one of the most fixable reasons a claim gets denied.
Here's the frustrating part about a VA denial: the VA rarely comes out and says “we don't believe your condition is connected to your service.”
Instead, the reason hides inside a wall of formal, repetitive language. Veterans read the letter three times and still can't tell why they lost. So let's do something more useful than defining terms — let's take an actual denial paragraph and translate it, line by line.
Decoded
A real denial, decoded
Below is a fictional example, written to look like the language veterans actually see in a rating decision. This one denies a claim for obstructive sleep apnea filed as secondary to service-connected PTSD.
“Service connection for obstructive sleep apnea, claimed as secondary to the service-connected posttraumatic stress disorder, is denied. The evidence confirms a current diagnosis of obstructive sleep apnea by sleep study. However, the VA examiner opined that the claimed obstructive sleep apnea is less likely than not (less than 50 percent probability) proximately due to or the result of the service-connected PTSD, noting the veteran's elevated body mass index as the more likely etiology. The private medical statement submitted was reviewed but assigned limited probative value, as it did not address the veteran's specific risk factors. Accordingly, the criteria for secondary service connection have not been met.”
It reads like a brick wall. But every phrase is doing a specific job. Here's what each one is actually saying:
“The evidence confirms a current diagnosis… by sleep study.”
Good news, hidden in plain sight
The VA agrees you have sleep apnea. The diagnosis isn't the problem. That means the fight is only about the connection — not whether you're sick.
“less likely than not (less than 50 percent probability)”
The whole ballgame
The VA's standard is “at least as likely as not” — a 50/50 tie is enough to win. The examiner put your odds below that line, so the claim fails on the medical opinion.
“proximately due to or the result of”
The secondary-claim test
The examiner is saying PTSD didn't cause the sleep apnea. Notice what's missing: aggravation. A condition can also be service-connected if PTSD worsened it — and this opinion never addresses that.
“elevated body mass index as the more likely etiology”
They blamed your weight
But this skips a key question a strong opinion would raise: did the PTSD contribute to the weight gain in the first place? Obesity is often an intermediate step — PTSD drives weight gain, and the weight gain drives the sleep apnea.
“limited probative value… did not address the veteran's specific risk factors”
Your letter was too generic
It didn't engage with your records, and it never rebutted the weight argument — so the VA gave it little weight. This is the single most common reason a private letter fails.
“the criteria for secondary service connection have not been met”
The bottom line
No proven nexus. Not “you don't qualify” — just “the connection wasn't shown well enough.” That's a fixable problem.
A “no nexus” denial almost never means your claim is impossible. It means the medical explanation was missing, incomplete, or unpersuasive.
Other phrasings
Your letter might say it differently — here's how to spot it
The example above is one version. The VA rarely uses the word “nexus” at all, and the phrasing changes from one decision to the next. If your letter contains any of these, you're most likely looking at the same “no nexus” problem — the medical connection wasn't found:
Different words, same gap: the VA didn't find the connection proven. And in almost every one of these, the fix is the same — a stronger, case-specific medical opinion that closes it.
Why it's fixable
Why this is one of the most fixable denials
Look again at what the VA conceded in that example: the diagnosis. When the VA already agrees you have the condition, the entire dispute narrows to one question — is it connected? That's a question a well-built medical opinion is designed to answer. You're not starting over; you're closing a specific gap.
At its core, a nexus is just the bridge between three things: a current diagnosis, an in-service event or a service-connected condition, and a medical link between them. When the VA says “no nexus,” it's the bridge that's missing. (New to the term? Here's what a nexus letter is.)
Element 1
Current diagnosis
A condition documented today.
Element 2
In-service event or service-connected condition
Something the VA already accepts.
Element 3
The medical link
The bridge — this is what's missing.
Root causes
Why the denial happened
In the example, the private letter was set aside for being generic. That's typical. “No nexus” denials usually trace back to a handful of causes:
- No medical opinion was submitted, or the one submitted was too generic
- The opinion didn't explain the veteran's specific history or timeline
- It never addressed aggravation — only causation
- Risk factors (like weight) weren't confronted head-on
- Medical literature was quoted but never applied to the actual veteran
- The veteran's lay statements weren't discussed
That fifth one — citations without application — is so common it's worth its own read: why medical literature alone isn't enough.
The fix
What actually fixes it
A strong nexus letter does the opposite of the one that got denied. It's specific to you, tied to your records and timeline, and it answers the objections the examiner raised instead of ignoring them. In the sleep apnea example, that means directly addressing the weight argument — explaining whether PTSD contributed to the weight gain, and whether it caused or aggravated the sleep-disordered breathing.
That's the difference between a letter that “sounds supportive” and one built to hold up. If your claim is sleep apnea, our sleep apnea nexus letter page walks through exactly these mechanisms, and how it works shows the full process from records to finished opinion. You can also see the full range of nexus letters Brightview writes.
Two paths
A new nexus letter — or a rebuttal?
After a denial, there are usually two medical paths, and the right one depends on why you lost.
Path A
A new nexus letter
Makes the case for connection from the ground up — useful when no opinion was submitted, or the one you had was too generic.
Path B
A rebuttal letter
Rather than starting over, it answers the VA examiner's negative opinion directly — pointing out what that examiner got wrong (the ignored aggravation, the risk factor blamed without support, the records never addressed) and explaining why a different conclusion is medically supported.
In the sleep apnea example above, where the entire denial rests on the examiner blaming the veteran's weight, a rebuttal aimed squarely at that reasoning is often the sharper tool. Learn more about rebuttal letters →
Already have a nexus letter that got denied?
Before you spend money on a new one, it may be worth having a physician check what went wrong. A Nexus Letter Review ($100) assesses whether your existing letter applies to your case, addresses aggravation, and rebuts the VA's reasoning — credited toward a new letter if you proceed.
Who reads your denial
Denied, and not sure what to do next? Start with someone who's read these from the inside
If you've been denied and you're staring at the letter with no idea what your next move should be, here's the most useful thing to know: the person best equipped to explain a VA denial is someone who used to write them.
Dr. Jessica Allen is a psychiatrist and a former VA Compensation & Pension examiner. She has sat in the examiner's chair and written the very kind of opinion your denial is based on — so she can read your decision and tell you why it happened: which theory failed, whether the examiner addressed aggravation or only causation, which risk factor got blamed without support, and what evidence would actually answer it. That's the difference between guessing at your next step and knowing it.
And she'll tell you straight. Sometimes the fix is a new nexus letter; sometimes it's a rebuttal to the examiner's opinion; and sometimes the issue is procedural — in which case the honest answer is that your VSO or attorney should handle the appeal lane while she handles the medicine. She reviews your denial and records personally and writes each opinion herself, for veterans in all 50 states. More about Dr. Allen →
Frequently asked questions
Common questions
What does “less likely than not” mean in my denial letter?
It means the examiner placed the probability of a connection below 50 percent. The VA's standard is “at least as likely as not” — a 50/50 balance is enough to grant — so a “less likely than not” opinion falls short and leads to denial.
The VA said my private nexus letter had “limited probative value.” What does that mean?
It means the VA didn't find the letter persuasive — usually because it was too generic, didn't engage with your specific records and risk factors, or didn't rebut the VA examiner's reasoning. A more detailed, case-specific opinion can carry more weight.
The VA blamed my weight for my sleep apnea. Can I still win?
Possibly. A strong opinion can address whether a service-connected condition like PTSD contributed to the weight gain itself, treating obesity as an intermediate step rather than an independent cause, and can address aggravation as well as causation.
Does a “no nexus” denial mean my claim is over?
No. It usually means the medical explanation was missing or unpersuasive, not that the claim is impossible. It's one of the most fixable denial reasons, often with a stronger, case-specific medical opinion.
Do I need a new nexus letter or a rebuttal?
It depends on why you were denied and what evidence is already in your file. Sometimes a new independent opinion is the answer; sometimes a rebuttal to a negative C&P exam fits better. A free consultation can sort out which.
Does it matter who writes my VA nexus letter?
Yes. A letter written by a qualified physician who understands the VA's standards — and, ideally, has served as a C&P examiner — is more likely to address the rating criteria and answer the objections that get private letters set aside.
My claim was denied years ago — is it too late to do anything now?
No — it's not too late. A denial from years ago doesn't close the door. As long as you can bring new and relevant evidence — such as a stronger, case-specific medical opinion — you can generally revisit a previously denied issue through a Supplemental Claim, even if it's been years or decades. Many veterans assume an old denial is final and never try again; often, the missing piece was simply a well-reasoned nexus opinion that was never submitted. How far back any benefits might be paid can depend on the details, which is a question for a VA-accredited representative — but the ability to try again is not lost with time.
Dr. Jessica Allen, M.D.
Psychiatrist and former VA Compensation & Pension examiner. Dr. Allen writes independent medical opinions, nexus letters, and rebuttals for veterans in all 50 states — built to answer the exact objections that lead to “no nexus” denials.
Please note. This article is educational and explains common VA denial language in general terms. The denial excerpt is fictional and for illustration only. This is not legal or medical advice, does not create a physician–patient relationship, and does not guarantee any VA outcome. For appeal deadlines and legal strategy, consult a VA-accredited attorney, claims agent, or VSO.
Denied for “no nexus”? Find out your options.
Call or book online. Brightview can review your denial and discuss whether a new nexus letter or a rebuttal could help — free consultation, no obligation.
Related
Related pages
- Denied VA Claims
- VA Denial Rebuttal Letters
- Nexus Letter Review
- Why Medical Literature Alone Is Not Enough for a VA Nexus Letter
- Sleep Apnea Nexus Letters
Educational information only. This article is provided for general educational purposes and does not constitute medical advice, legal advice, or a treatment relationship. Reading it does not establish a physician–patient relationship with Dr. Allen or Brightview Psychiatry Solutions PLLC. No outcome in any VA claim is promised or implied; the VA determines service connection and assigns all disability evaluations. Veterans should consult their own treating providers regarding medical care and an accredited representative, agent, or attorney regarding claims. If you are in crisis, the Veterans Crisis Line is available 24/7: dial 988 and press 1, or text 838255.