Nexus Letters
Sleep Apnea Nexus Letter for VA Disability Claims
You snored through barracks nights, woke up exhausted after deployments, and nobody thought twice about it. Years later, a sleep study confirms what your bunkmates already knew.
Sleep apnea claims often stall when:
- Symptoms were never written down in service
- The diagnosis came years after discharge
- The examiner blamed your weight or age
- The link to PTSD or another condition was never explained
If any of these sound familiar, a sleep apnea Nexus Letter can help close the gap.
Sleep apnea is one of the most common conditions veterans claim, and one of the most often denied. The diagnosis is rarely the problem. The problem is that the file doesn’t explain how your sleep apnea connects to your service, or to a condition the VA has already granted.
A sleep apnea nexus letter is the medical opinion that makes that connection. Nexus Veteran MD prepares evidence-based opinions for veterans and the attorneys who represent them. Below, we explain the ways sleep apnea can be service-connected, why these claims get denied, and what makes an opinion hold up.
What a Sleep Apnea Nexus Letter Does
A Nexus Letter is a written medical opinion connecting your current condition to your military service, or to a condition that’s already service-connected. For sleep apnea, it usually explains that your obstructive sleep apnea is at least as likely as not caused or made worse by something in service or by another service-connected condition.
The letter isn’t a sleep study and doesn’t replace one. It’s the reasoning layer: it explains what your diagnosis, your service history, and your medical records mean when you put them together.
How Sleep Apnea Gets Service-Connected
There’s more than one path, and the right one depends on your history.
1. Direct service connection Your sleep apnea began during service. Evidence can include in-service complaints of fatigue or snoring, sleep problems noted in your records, and buddy statements from roommates or bunkmates who heard you snore, gasp, or stop breathing at night. Many veterans were never tested in service, so lay statements often carry this claim.
2. Secondary to PTSD PTSD disrupts sleep, keeps the body in a state of hyperarousal, and is often treated with medications that can cause weight gain. Each of these can contribute to obstructive sleep apnea. See our page on sleep apnea secondary to PTSD.
3. Secondary to rhinitis or sinusitis Chronic nasal obstruction can narrow the airway and contribute to sleep-disordered breathing. If your rhinitis or sinusitis is already service-connected, it may support a secondary claim. See our page on sleep apnea secondary to rhinitis.
4. Secondary through medication or reduced activity Weight gain from medications for a service-connected condition, or from limited activity due to a service-connected back or knee injury, can be part of the link. The opinion needs to explain the chain clearly, from the service-connected condition to the weight gain to the sleep apnea.
5. Aggravation If you had mild sleep apnea before, a service-connected condition may have made it permanently worse. The VA can compensate the added worsening.
For more on how these claims work, see our guide to secondary service connection.
Why Sleep Apnea Claims Get Denied
Sleep apnea denials follow a familiar pattern. Knowing the usual reasons tells you what your nexus letter has to address.
“Sleep apnea is due to obesity.” This is the most common denial reason. But weight gain can itself be part of the chain if it was caused by a service-connected condition or its medications. A strong opinion addresses weight directly instead of ignoring it.
“No sleep problems documented in service.” Most service members were never offered a sleep study, and snoring rarely made it into medical records. Statements from people who slept near you in service can fill that gap.
“Diagnosed years after discharge.” A late diagnosis doesn’t break the link. Sleep apnea is often undiagnosed for years. The opinion should explain why your symptoms and history point back to service.
“No opinion linking it to PTSD or another condition.” A diagnosis plus your belief that PTSD caused it is usually not enough. The VA needs a medical professional to explain the mechanism.
“The C&P examiner gave a negative opinion.” Many negative opinions are brief and don’t address secondary or aggravation theories at all. A detailed private opinion that responds to the examiner’s reasoning can outweigh it.
What the VA Requires
For direct service connection:
- A current diagnosis of obstructive sleep apnea, confirmed by a sleep study.
- An in-service event or symptoms, such as documented fatigue, snoring, or witness statements.
- A medical link between the two.
For secondary service connection under 38 CFR § 3.310:
- A current diagnosis, confirmed by a sleep study.
- A service-connected primary condition, such as PTSD or rhinitis.
- A medical opinion explaining how the primary condition caused or aggravated your sleep apnea.
The sleep study is essential. The VA won’t grant sleep apnea without one, no matter how strong the rest of the evidence is.
What a Strong Sleep Apnea Nexus Letter Contains
- Provider credentials relevant to sleep medicine or the primary condition.
- A list of records reviewed: service treatment records, sleep study results, VA and private treatment notes, medication history, prior C&P exams, and buddy statements.
- The diagnosis, with the sleep study findings.
- The theory of connection, whether direct, secondary, or aggravation, stated clearly.
- A medical rationale that explains the mechanism, such as how PTSD-related sleep disruption or medication-related weight gain contributed.
- A direct response to weight and age, the two alternative causes raters raise most.
- The probability statement: “at least as likely as not.”
- Signature, date, and contact information.
The rationale is what decides these claims. A letter that says “sleep apnea is related to PTSD” without explaining why is easy to set aside.
How the VA Rates Sleep Apnea
Sleep apnea is currently rated under diagnostic code 6847 in 38 CFR § 4.97:
Rating | Criteria |
|---|---|
0% | Diagnosed, but no symptoms |
30% | Persistent daytime sleepiness |
50% | Requires a breathing device, such as a CPAP machine |
100% | Chronic respiratory failure with carbon dioxide retention or cor pulmonale, or requires a tracheostomy |
The proposed change. In 2022, the VA proposed rating sleep apnea based on how well treatment works, rather than on whether you use a CPAP. Under that proposal, a veteran whose CPAP fully controls symptoms could be rated 0%. As of October 2026, the proposal has not been finalized, so the current criteria above still apply. Veterans already rated are generally protected from reductions based solely on a rating schedule change.
Working With Nexus Veteran MD
Submit your records for review. A qualified medical professional evaluates your sleep study, service history, and medical records against the VA’s standards, and determines which theory of connection, if any, the evidence supports. If an honest opinion can be written, we prepare a detailed letter with full rationale. If the evidence doesn’t support one, we tell you plainly.
If your sleep apnea is already service-connected and you need to document its current severity, a private DBQ may be the better fit. See our main nexus letter page for how the service works across conditions.
Frequently Asked Questions
Do I need a sleep study for a VA sleep apnea claim?
Yes. The VA requires a sleep study confirming the diagnosis. Without one, the claim will be denied regardless of other evidence.
Can sleep apnea be service-connected if it wasn't diagnosed in service?
Yes. Many veterans are diagnosed years later. Symptoms in service, buddy statements, and a medical opinion explaining the connection can support the claim.
Can I claim sleep apnea secondary to PTSD?
Yes. PTSD and the medications used to treat it can contribute to sleep apnea. You’ll need a medical opinion explaining how.
The VA said my sleep apnea is due to my weight. Is my claim over?
Not necessarily. If the weight gain was caused by a service-connected condition or its medication, that can be part of the link. The opinion needs to explain it.
Will the proposed rating change affect me?
It isn’t final. The current rules still apply, and veterans already rated are generally protected from reductions based only on a rating schedule change.
Do I need a nexus letter or a DBQ?
A nexus letter if the VA hasn’t accepted the connection. A DBQ if your sleep apnea is already service-connected and you need to document how severe it is.
This page is general information, not individualized medical or legal advice.