Sleep Apnea Nexus Letter: When the Rating You Already Have Is the Way In
Sleep apnea is rarely won on its own. It usually connects through a condition the VA has already service-connected — and the most common way this claim is lost is filing it as if it stands alone.
$149 to start — refunded in full if a physician can't support your case. $400 on delivery.
✓ About 10 minutes · ✓ No records needed up front · ✓ HIPAA-encrypted
Dr. Ryan K. — board-certified family medicine, Navy veteran (2005–2013, OEF deployment). He reads the records and signs the letter.
The pathways we argue most.
Sleep apnea rarely stands on its own. In the cases we support, it almost always travels through something the VA has already conceded. These four cover nearly every sleep apnea case we take.
The mental health cluster
PTSD · Depression · GADIf you are rated for PTSD, depression or anxiety, that rating can carry the sleep apnea claim.
This is the single most common route we see. Post-traumatic stress, major depression and generalized anxiety each disrupt sleep in ways that are well described in the sleep-medicine literature: fragmented sleep architecture, reduced restorative sleep, and persistent autonomic arousal that destabilizes the upper airway overnight.
There is a second, entirely separate mechanism the VA often overlooks — the medications. SSRIs, SNRIs, mirtazapine and atypical antipsychotics prescribed for a service-connected mental health condition are associated with substantial weight gain, and weight is the strongest modifiable risk factor for obstructive sleep apnea.
Gupta MA, Simpson FC. Obstructive sleep apnea and psychiatric disorders: a systematic review. J Clin Sleep Med. 2015.
The upper airway
Allergic rhinitis · Chronic sinusitis · Deviated septumAlready rated for allergic rhinitis or sinus problems? That is an upstream condition most veterans never think to use.
Badly under-used, and often sitting right there in the file already service-connected. Chronic nasal inflammation raises nasal airway resistance. Higher resistance means a more negative inspiratory pressure is generated downstream in the pharynx on every breath — and that is precisely the force that collapses a soft airway during sleep.
Chronic nasal obstruction also drives habitual mouth breathing, which displaces the tongue posteriorly and narrows the retroglossal airway. A veteran rated for allergic rhinitis or chronic sinusitis frequently already holds the upstream condition needed for this claim and has never been told it matters.
Weight, through a rated condition
Orthopedic · Chronic painIf a rated joint stopped you moving and the weight came after, that chain is arguable.
A service-connected knee, back, hip or ankle limits what a veteran can do. Activity falls, weight climbs, and pharyngeal fat deposition narrows the airway. The VA frequently denies these claims by calling the weight gain the veteran's own doing — which is a rating conclusion, not a medical finding, and it is answerable when the mobility restriction is documented.
Direct service connection
In-service onsetIf the snoring or witnessed pauses are documented IN your service records, you may not need a secondary theory at all.
Still the right theory in a minority of files — when the service treatment records or credible buddy statements document loud snoring, witnessed pauses in breathing, or disabling daytime somnolence during active duty. A diagnosis that only came years after separation does not defeat a direct claim if the symptoms started in service.
The mistake is filing direct by default, with no in-service documentation, when a secondary pathway was sitting in the file the whole time.
$149 to start, refunded in full if we can’t support it.
Causation or aggravation is not a style choice.
Two different regulations. Two different burdens. The facts in your file decide which one a physician can honestly sign — and picking the wrong one is a common way an otherwise good claim fails.
Caused by
The service-connected condition brought the sleep apnea into existence. This is the cleaner, stronger theory when the record supports it, and it is usually available when the sleep apnea appears in the timeline after the service-connected condition.
It asks the physician to explain a mechanism, not just an association — which is why a letter that only cites a statistical correlation tends to draw the "speculative" denial.
Aggravated by
The sleep apnea arose on its own, and the service-connected condition made it worse than it would otherwise have become. This is the honest theory when the sleep apnea was already diagnosed before the service-connected condition existed.
It requires no pre-service baseline. That is a persistent misunderstanding — the baseline requirement belongs to a different regulation covering conditions worsened by service itself, not by another service-connected condition.
What you actually receive.
A signed independent medical opinion, structured the way the VA expects to read one — qualifications, methodology, records reviewed, history, diagnosis, the medical reasoning, the opinion, and the literature behind it.
The medical literature establishes several mechanisms by which post-traumatic stress disorder contributes to the development of obstructive sleep apnea. Chronic sleep fragmentation and sustained autonomic arousal reduce upper airway dilator muscle tone during sleep, and the pharmacologic management of the condition is independently associated with clinically significant weight gain…
Applying that literature to this veteran specifically: his service treatment records document…
It is my independent medical opinion that this veteran's obstructive sleep apnea is more likely than not (greater than 50% probability) proximately due to his service-connected post-traumatic stress disorder.
Read the whole thing.
This is a complete sample letter — not an excerpt, not a template with blanks. It is the same structure every letter we write follows, with the veteran's identifying details removed.
Read the reasoning section in particular. That section is where a nexus letter is won or lost, and it is the part a template service cannot produce, because it has to be built from your records.
Open the sample letter (PDF)Opens in a new tab. No email required.
What a sleep apnea nexus letter must contain.
The VA weighs a medical opinion by its reasoning, not its conclusion. Under Nieves-Rodriguez v. Peake, 22 Vet. App. 295 (2008), an opinion needs a reasoned analysis behind it; a bare statement that two conditions are related carries little or no weight. A letter that holds up has each of these parts.
When more than one mechanism is available, the letter should lead with the one your records document best. For PTSD → sleep apnea, that is usually weight gain, which is recorded at nearly every clinical visit, or hyperarousal, which shows up in treatment notes and the rating decision. Alcohol used to cope with PTSD symptoms, which further depresses upper airway muscle function during sleep, is another route when the records show it. A mechanism that rarely appears in a veteran's chart is harder for a letter to anchor to evidence.
To see these parts in a finished letter, see a sample sleep apnea nexus letter (PDF).
Why sleep apnea nexus letters get rejected.
A physician's willingness to write a letter is a starting point, not a guarantee. Most of these letters fail because of how they were written, not because the claim was weak.
Written without the records
An opinion built only on what the veteran said in an appointment has no factual foundation. Adjudicators and C&P examiners look for whether the physician states that the records were reviewed, and whether the opinion cites what is actually in them: dates, diagnoses, the AHI, medication history, the timeline.
A conclusion with no mechanism
"The veteran's sleep apnea is related to his service-connected PTSD" gives the adjudicator nothing to weigh against a C&P examiner who says the opposite — both are bare conclusions. Explaining the mechanism is what turns an opinion into medical reasoning rather than a doctor's say-so.
Language below the threshold
"Possibly related," "may have contributed," "cannot be ruled out," "there is a connection" and "consistent with service" all fall short. "At least as likely as not," "more likely than not," "is due to" and "is the result of" meet or exceed the standard. Under 38 CFR 3.102 the VA resolves reasonable doubt in the veteran's favor when the evidence is evenly balanced, and "at least as likely as not" is the floor that reaches it.
The wrong type of apnea
Obstructive, central and mixed sleep apnea work through different mechanisms. An argument that runs through the upper airway fits obstructive apnea; applied unchanged to predominantly central apnea, it is easy for an examiner to challenge. The physician should read the sleep study itself and, if the apnea is central or mixed, address the neurological mechanism rather than only the airway.
The timeline left unexplained
When years separate service, or the service-connected condition, from the sleep apnea diagnosis, the adjudicator will ask why. The letter has to answer it: either the symptoms were present all along and went unrecognized, or the link developed in between — for example, PTSD treatment that caused weight gain. An unanswered question defaults against the veteran.
Template language
Adjudicators have read thousands of these letters and recognize boilerplate with a name dropped into the blanks, whoever signed it. A letter that references your AHI, your medication and your weight trend carries weight a template cannot. Specificity is the proxy for credibility.
What strengthens a sleep apnea file.
You do not need all of this. Two or three solid pieces are often enough. Send what you have — a physician will tell you what is missing and whether it is worth chasing.
How the VA rates sleep apnea.
Service connection and rating percentage are two separate questions. A nexus letter addresses the first. The rating follows from the criteria below.
| Rating | Criteria |
|---|---|
| 100% | Chronic respiratory failure with carbon dioxide retention or cor pulmonale, or requires a tracheostomy. |
| 50% | Requires use of a breathing assistance device such as a continuous positive airway pressure (CPAP) machine. |
| 30% | Persistent daytime hypersomnolence. |
| 0% | Asymptomatic, with documented sleep disordered breathing. |
What Board of Veterans' Appeals decisions show.
We read the Board of Veterans' Appeals decisions on sleep apnea from 2021 to 2025. In them, 8,600 service-connection issues reached a final decision: 5,173 were granted and 3,427 were denied. When a private medical opinion on sleep apnea was in the record, the Board granted 2,794 of 3,263 issues (86%). Without one, it granted 2,379 of 5,337 (45%). That is a grant rate about 92% higher. In at least 670 of those 2,794 grants, the Board said plainly that it found the private opinion persuasive or probative. In one case it wrote, "The Board finds the private sleep apnea opinion to be the most probative evidence of record." Most denials, 2,958 of 3,427, had no private opinion at all. When the Board set one aside, the usual reason was thin reasoning or general research never tied to the veteran's own history. This is an association, not proof of cause. These are Board of Veterans' Appeals decisions from 2021-2025, the appeal level. They do not reflect how your regional office decides claims, and no single number predicts an individual case.
One flat rate. Refundable to start.
The same price for every condition and every veteran. No tiers, no rush fees, no upsells.
Klarna or Affirm available at checkout on both payments.
The three questions we get most.
Can sleep apnea be service connected secondary to PTSD?
Yes. Secondary service connection under 38 CFR 3.310 allows a condition to be connected through a condition that is already service-connected. PTSD, depression and anxiety disorders are recognized in the sleep-medicine literature as contributing to obstructive sleep apnea through sleep fragmentation, autonomic arousal, and psychotropic medication weight gain. It is the most common pathway we argue.
What if my sleep apnea was diagnosed before my service-connected condition?
Then causation is usually the wrong theory and aggravation under 38 CFR 3.310(b) is the honest one — the service-connected condition made the sleep apnea worse than it would otherwise have become. The order of the diagnoses in your records is what decides which theory a physician can actually defend, and it is the first thing we check.
I was already denied. Is it over?
No. A denial for lack of a medical link is the situation a nexus letter exists for — it is the new and relevant evidence a supplemental claim needs. Send us the denial letter itself: it is the single most useful document you have, because it states in the VA's own words exactly what was missing. In fiscal year 2025 the VA granted 48.2 percent of supplemental claims; our 2025 VA claims and appeals report breaks down the rest.
Still have a question? Email [email protected] — a real person answers.
Send your records. We'll tell you straight.
About 10 minutes. You can upload records during the process or afterward — nothing is needed up front.
A physician reviews what you send and you get a straight answer on whether your case is supportable.
Open Secure Intake Form →$149 refundable deposit at intake. $400 only if we can support your case.
Not sure yet? Run the free case check — no payment, no obligation.