Can sleep apnea be service connected secondary to PTSD?

Yes. Sleep apnea claimed as secondary to a service-connected mental health condition is one of the most frequently filed secondary claims in the system. It can be granted where a clinician explains how the service-connected condition caused or aggravated the apnea, which can run through the condition itself or through weight gain the condition caused.

What does VA have to decide in an obesity intermediate step case?

Three questions. Whether the service-connected disability caused the veteran to become obese. If so, whether that obesity was a substantial factor in causing the claimed condition. And whether the claimed condition would not have occurred but for the obesity caused by the service-connected disability. If all three are answered yes, the claimed condition may be service connected on a secondary basis.

Do I need a sleep study from my time in service?

No. Sleep studies were rarely done in service, and their absence does not decide the claim. What can establish the condition began in service is evidence of the symptoms: statements from a spouse, roommate, or fellow service members about loud snoring, stopped breathing, gasping, or daytime exhaustion. You do need a current diagnosis, and that requires a sleep study now.

What conditions besides PTSD can support a sleep apnea claim?

Anything with a credible mechanism. Nasal and sinus conditions that obstruct the airway, including rhinitis, sinusitis, and a deviated septum. Gastroesophageal reflux disease. Asthma. Medication for a service-connected condition that suppresses respiratory drive or drives weight gain. Any service-connected condition that has substantially limited activity for years.

How is sleep apnea rated?

Under diagnostic code 6847 in 38 C.F.R. § 4.97, on four levels. Zero percent for asymptomatic apnea with documented sleep disordered breathing, 30 percent for persistent daytime hypersomnolence, 50 percent where the condition requires the use of a breathing assistance device such as a CPAP machine, and 100 percent for chronic respiratory failure with carbon dioxide retention or cor pulmonale, or where a tracheostomy is required.

Is the 50 percent CPAP rating going away?

VA proposed revising the respiratory rating criteria in February 2022 and issued a supplemental proposal for sleep apnea in September 2024. Neither has been finalized. Until a final rule publishes with an effective date, the existing criteria in 38 C.F.R. § 4.97 control, including the 50 percent level for a required breathing assistance device.

Can a service-connected condition aggravate sleep apnea I already had?

Yes. Under 38 C.F.R. § 3.310(b), if a service-connected disability made existing sleep apnea worse, the increase in severity is service connected even though the apnea itself is not. That is a separate question from causation, and it is frequently the one nobody asks.

Sleep Apnea Secondary to PTSD, and the Weight Question VA's Own Lawyers Already Answered

Q: VA denied my claim because obesity is not service connected. Is that correct?

Not as a complete answer. VA's General Counsel addressed this in a January 2017 precedent opinion. Obesity by itself is not a disease or injury and cannot be service connected on its own. But obesity can act as an intermediate step between a service-connected disability and a claimed condition, which supports secondary service connection under 38 C.F.R. § 3.310(a). Precedent opinions of the General Counsel bind VA adjudicators, so a denial that stops at 'obesity is not service connected' has not finished the analysis.

The denial almost writes itself, and VA writes it constantly:

The Veteran’s obstructive sleep apnea is less likely than not related to service-connected PTSD. The medical literature attributes obstructive sleep apnea primarily to obesity. The Veteran’s body mass index is 34. Obesity is not a service-connected disability.

Read it closely and there is an argument buried in there that VA’s own lawyers rejected almost a decade ago.

The weight argument, and what actually answers it

In January 2017 VA’s Office of General Counsel issued a precedent opinion, VAOPGCPREC 1-2017, on service connection based on obesity. It holds two things, and veterans usually only ever hear the first.

Obesity by itself is not a disease or injury. It cannot be service connected on its own, directly or secondarily. There is no rating for it and no claim to file for it.

Obesity can be an intermediate step. It can sit in the middle of a causal chain between a service-connected disability and a claimed condition, and that supports secondary service connection under 38 C.F.R. § 3.310(a).

The opinion sets out three questions an adjudicator has to resolve:

Did the service-connected disability cause the veteran to become obese?
If so, was that obesity a substantial factor in causing the claimed condition?
Would the claimed condition not have occurred but for the obesity caused by the service-connected disability?

Three yeses, and the claimed condition may be service connected on a secondary basis.

This matters more than a typical piece of guidance, because precedent opinions of the General Counsel are binding on VA adjudicators. The person deciding your claim does not get to disagree with it.

So a denial that stops at “obesity is not a service-connected disability” has not reached the question. Nobody claimed obesity. The claim is that PTSD changed sleep, activity, appetite, and medication, that those changes drove weight gain, and that the weight gain is what produced the apnea. That is a chain the regulation accommodates and the General Counsel described.

Weight is not the only route, and often not the best one

The weight argument gets the attention because it is where the fights happen. It is one of four routes, and for many veterans it is not the strongest.

Directly, from service. Sleep apnea that began in service can be service connected directly, and the absence of a sleep study in your records does not decide it. Sleep studies were rarely ordered. What establishes the condition are the symptoms: a spouse, a roommate, or the people who shared a berthing or a tent describing loud snoring, stopped breathing, gasping, or exhaustion that no amount of sleep fixed. Lay evidence is competent to describe observable symptoms, which is covered in “I Never Went to Sick Call.” That Doesn’t End Your Claim.

Secondary, with no weight involved at all. A service-connected condition can cause or worsen apnea through mechanisms that have nothing to do with body mass:

Nasal and sinus conditions. Rhinitis, sinusitis, a deviated septum. Anything that obstructs the airway makes obstructive events more likely and more severe.
Gastroesophageal reflux. The relationship runs in both directions, and either direction can support a claim depending on which condition is already connected.
Asthma and other respiratory conditions.
Medication. Drugs prescribed for a service-connected condition that suppress respiratory drive during sleep, or that drive weight gain as a side effect.
Mental health conditions themselves. Not just through weight. The relationship between post-traumatic stress and sleep disordered breathing is documented independent of body mass.

Secondary, through weight gain. The intermediate step route described above.

Aggravation. If you already had sleep apnea and a service-connected condition made it worse, 38 C.F.R. § 3.310(b) service connects the increase in severity even though the apnea itself is not connected. This is the route nobody asks about, covered in You Had It Before. A Service-Connected Condition Made It Worse.

Those routes are not exclusive. A claim can be filed and developed on more than one, and it should be when the record supports more than one.

What the medical opinion has to do

These claims are decided on the opinion, and a generic one loses.

For the weight route, the opinion has to walk the three questions. Not “the Veteran’s sleep apnea is at least as likely as not related to PTSD,” but an explanation of how the service-connected condition produced the weight gain, why that weight gain was a substantial factor, and why the apnea would not have developed without it. An opinion that skips the chain leaves the adjudicator to reconstruct it, and they will not.

For the other routes, the mechanism has to be named. Airway obstruction from chronic nasal congestion is a specific physiological claim. So is the effect of a specific medication.

And every opinion should reach aggravation, not just causation. An examiner asked only whether the apnea was caused, who answers only that, has left half of § 3.310 undecided. That defect and what to do about it is covered in Your Secondary Claim Was Denied Under the Wrong Test. What separates an adequate opinion from an inadequate one is in The Exam Is the Appointment. The Opinion Is What Decides the Claim.

What it rates once it is connected

Sleep apnea is rated under diagnostic code 6847 in 38 C.F.R. § 4.97, on four levels:

0 percent. Asymptomatic, with documented sleep disordered breathing.
30 percent. Persistent daytime hypersomnolence.
50 percent. The condition requires the use of a breathing assistance device such as a CPAP machine.
100 percent. Chronic respiratory failure with carbon dioxide retention or cor pulmonale, or where a tracheostomy is required.

The 50 percent level turns on the word requires. A machine sitting unused in a closet is not the standard, and neither is a prescription with no clinical basis behind it. What supports the rating is a sleep study and a treating provider’s judgment that the device is necessary.

A note on timing, because this comes up in every conversation about sleep apnea right now. VA proposed revising the respiratory rating criteria in February 2022 and issued a supplemental proposal covering sleep apnea in September 2024. Under those proposals the ratings would turn on how well treatment works rather than on whether a device is required. Neither proposal has been finalized. Until a final rule publishes with an effective date, the criteria above are the criteria, and claims are decided under them.

Where these claims get denied

The opinion answered the literature, not the veteran. A recitation that obesity is the leading cause of obstructive sleep apnea in the general population says nothing about whether this veteran’s service-connected condition caused this veteran’s weight gain.

The intermediate step was never analyzed. The three questions do not appear anywhere in the examination report or the decision.

Only one route was developed. The claim was filed as secondary to PTSD, the examiner addressed only that, and the nasal obstruction sitting in the same file was never considered.

Aggravation went unasked. Again.

The apnea was called a symptom rather than a disability. Sleep apnea is a separately diagnosed condition with its own diagnostic code. Sleep impairment as a symptom of a mental health condition is a different thing, and it is already accounted for in the mental health rating. The two get conflated, and the conflation costs a separate 50 percent evaluation.

What to do with this

Get the sleep study. Nothing works without a current diagnosis, and the study is what establishes it.
Look at your whole rating sheet before picking a theory. Nasal and sinus conditions, reflux, asthma, and mental health conditions can each support this claim, and more than one route can be developed at once.
Get statements from the people who were there. For the direct route, someone who slept within earshot of you in service is the evidence. VA Form 21-10210 is the form.
If weight is part of the chain, say so directly and build the opinion around the three questions. Do not let the claim rest on a clinician’s one-line conclusion.
Read a denial for the word obesity. If the analysis stops at obesity not being service connected, it stopped short of what VA’s own General Counsel requires.
Watch the rating criteria. If a final rule publishes, the effective date will matter, and claims already decided under the current criteria are governed by different rules than claims filed after.

Whether any particular claim succeeds depends on the evidence, the diagnoses, and how the file is built. Nobody can tell you your outcome. But “obesity is not a service-connected disability” is a true sentence that answers a question nobody asked.

Blackmore Veterans Law, P.C. is a solo practice representing veterans in VA disability claims and appeals. Contact us to discuss your situation.

This article is general information about VA disability law and is not legal advice for any individual case. Reading it does not create an attorney-client relationship. Attorney advertising.