Select Your Primary Condition
What Are Secondary Service-Connected Conditions?
A secondary service-connected condition is a disability that was caused by or aggravated by a condition that is already service-connected. The VA calls this "secondary service connection" under 38 C.F.R. § 3.310.
For example, if you have service-connected PTSD and you develop sleep apnea as a result of PTSD-related hyperarousal, you may be able to claim the sleep apnea as secondary to your PTSD. If approved, you receive a separate disability rating and additional compensation for the sleep apnea.
Three things you need to establish a secondary claim:
- An existing service-connected primary condition (rated or pending rating)
- A current diagnosis of the secondary condition
- A medical nexus letter from a physician linking the secondary condition to the primary
How to File a Secondary Condition Claim
Filing a secondary claim is the same process as filing any VA disability claim, but your nexus letter must specifically state that the secondary condition was "caused by or aggravated by" your primary service-connected condition. Use VA Form 21-526EZ and identify the condition as a secondary claim on the form.
The strongest secondary claims include:
- A nexus letter from a treating physician or specialist who knows your medical history
- Medical records showing the treatment timeline — demonstrating that the secondary condition appeared or worsened after the primary condition
- Peer-reviewed medical literature supporting the biological or physiological link (optional but powerful)
Frequently Asked Questions
How many secondary conditions can I claim?
There is no limit. You can claim any condition that a physician can link to a service-connected primary condition. Some veterans have 10 or more service-connected conditions, many of which are secondary to one or two primary conditions. Each one contributes to your combined disability rating and increases your monthly compensation.
Can a secondary condition become a primary condition?
Once a condition is service-connected — whether as primary or secondary — it remains service-connected regardless of what happens to the primary. If the primary condition's rating is reduced or removed, the secondary condition keeps its rating. It does not "fall off" because the primary was modified.
What does "aggravation" mean for secondary claims?
If you already had a condition before service or before your primary service-connected disability was established, you may still be eligible if the service-connected condition has worsened (aggravated) the pre-existing condition beyond its natural progression. The standard is whether the primary disability materially worsened the secondary condition — not just temporarily.
Does the medical literature support the nexus link?
For the most common relationships (e.g., PTSD-to-sleep apnea, back pain-to-radiculopathy, tinnitus-to-hearing loss, TBI-to-migraines), there is substantial peer-reviewed research. A good nexus letter will cite relevant studies. Your physician can reference resources like PubMed to find supporting literature. This significantly strengthens a secondary claim.