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Sleep apnea is one of the most valuable conditions a veteran can get service-connected — and one of the most misunderstood. It’s also frequently connected to conditions you’re already rated for, which makes it one of the best secondary claims to know about. Here’s how it actually works.

How the VA Rates Sleep Apnea

Sleep apnea is rated under 38 C.F.R. § 4.97, Diagnostic Code 6847, based on how the condition is treated rather than how severe your symptoms feel day to day:

• 0% — you have a documented diagnosis but no required treatment.
• 30% — you have persistent daytime hypersomnolence (excessive daytime sleepiness).
• 50% — you’re required to use a breathing assistance device, most commonly a CPAP machine.
• 100% — you have chronic respiratory failure with carbon dioxide retention or cor pulmonale, or you require a tracheostomy.

The practical detail most veterans don’t realize: being prescribed a CPAP is what typically triggers the 50% rating, not how tired you feel or how bad your apnea “sounds.” A sleep study (polysomnogram) showing your diagnosis, plus a prescription for a CPAP, is usually the core of the evidence package.

Filing a Direct Claim

For a direct service connection, you need:

1. A current diagnosis — a sleep study showing your Apnea-Hypopnea Index (AHI) and the type of sleep apnea (obstructive, central, or mixed).
2. An in-service event or aggravating factor — this can include documented complaints of snoring, fatigue, or witnessed breathing pauses during service, weight gain tied to a service-connected injury that limited activity, or a diagnosed in-service respiratory condition.
3. A medical nexus connecting the diagnosis to service. Direct sleep apnea claims are harder to win than secondary ones because it’s less common for sleep apnea to be directly caused by military service — which is exactly why the secondary pathway below matters so much.

Filing Sleep Apnea as a Secondary Claim

This is where most successful sleep apnea claims actually come from. If you’re already service-connected for one of the following, sleep apnea may be secondary to it:

• PTSD and other mental health conditions — hyperarousal, nightmares, and medication side effects are well-documented contributors to disrupted breathing during sleep.
• Weight gain from a service-connected orthopedic condition — if a knee, back, or joint condition limited your ability to exercise and led to weight gain, and that weight gain contributed to your sleep apnea, this is a recognized secondary pathway.
• Rhinitis, sinusitis, or a deviated septum — nasal and airway conditions can directly contribute to obstructive sleep apnea.
• GERD (acid reflux) — nighttime reflux is linked to sleep-disordered breathing in some veterans.

For a secondary claim, you need a nexus opinion connecting your already service-connected condition to your sleep apnea — showing the second condition is “at least as likely as not” caused or aggravated by the first. This is a case where a well-supported nexus letter carries a lot of weight, especially for the PTSD-to-sleep-apnea and weight-gain pathways, since the VA will want a clear medical explanation of the connection. Browse the Nexus Letter Directory if you need a provider who can write one.

What Evidence to Gather

• Sleep study results (in-service if you have them, and current)
• CPAP prescription and compliance data if available
• Buddy statements describing snoring or breathing pauses observed during service or shortly after
• Medical records showing the service-connected condition you’re claiming as the secondary cause
• A nexus letter linking the two, if the connection isn’t already well-documented in your file

How This Affects Your Overall Rating

Because sleep apnea can jump straight to 50% with a CPAP prescription, it often has an outsized effect on a veteran’s combined rating compared to conditions that only add 10% or 20%. Once you have a diagnosis and a proposed rating, run your full disability picture through the VA Disability Rating Calculator to see how adding sleep apnea changes your combined percentage and monthly compensation — the VA’s combined ratings table doesn’t add straight percentages, so the jump can be bigger than it looks on paper.