Sleep Apnea Secondary Claims Guide

How to claim Sleep Apnea as secondary to PTSD, sinusitis, rhinitis, or other service-connected conditions — with evidence tips and nexus letter guidance.

What Is a Secondary Claim for Sleep Apnea?

A secondary claim means you are saying your Sleep Apnea was caused or aggravated by a condition already on your VA rating. You do not need to prove a direct in-service event — only that the link exists.

Common Primary Conditions Linked to Sleep Apnea

Primary Condition	How It Links
PTSD	Hyperarousal disrupts sleep architecture, directly worsening or causing OSA
Sinusitis / Rhinitis	Nasal obstruction forces mouth breathing, collapsing the airway
Deviated septum	Same airway-collapse mechanism as sinusitis
TBI	Neurological changes alter respiratory drive during sleep
Obesity (if SC)	Weight gain from a service-connected medication or condition

Rating Levels (VA Diagnostic Code 6847)

Rating	Criteria
50%	Requires use of a breathing assistance device (CPAP, BiPAP, etc.)
30%	Persistent daytime hypersomnolence
10%	Documented sleep disorder, no treatment required
0%	Asymptomatic, no chronic disability

Most veterans with a CPAP prescription receive 50% — this is the most common rating.

Evidence You Need

Diagnosis — A sleep study (polysomnography) confirming OSA. VA will order one if you don't have it.
Nexus letter — A physician statement connecting your Sleep Apnea to your primary SC condition. This is the most important document.
Buddy statements — Family members who can describe your snoring, gasping, or daytime fatigue.
Medical literature — Published research linking PTSD (or your primary condition) to Sleep Apnea. Include one or two studies with your claim.

Writing a Strong Nexus Letter

Your nexus letter needs three things:

A statement that the doctor reviewed your records
A clear conclusion: "at least as likely as not" that condition A caused or aggravated condition B
The medical rationale (one to two paragraphs of reasoning)

Avoid doctors who only write "I cannot determine a nexus." That is a denial waiting to happen. Seek a doctor willing to write a clear opinion.

Filing Tips

File using VA Form 21-526EZ (initial claim) or 21-0995 (supplemental claim)
Check "Secondary to" and enter your primary SC condition in the remarks
Attach the nexus letter, sleep study, and any supporting research before submission
If denied, file a supplemental claim with stronger nexus evidence — do not give up after one denial

Effective Date

Your effective date is the date VA receives your claim — not the date of diagnosis. File as soon as you have your sleep study results, even if you are still gathering nexus evidence. You can submit evidence later.