Secondary service connection
Polycythemia Secondary to Sleep Apnea
If VA already rates you for Sleep Apnea, polycythemia can be claimed as secondary under 38 CFR § 3.310 — you do not have to prove it started in service.
Already rated
Sleep Apnea
Service-connected
The claim
Polycythemia
Secondary · 38 CFR § 3.310
What the claim needs on paper
- A current diagnosis: Polycythemia
- Your service-connected Sleep Apnea
- A medical opinion linking the two — “at least as likely as not”
How this secondary claim works
The medical link
The body compensates for chronic low oxygen from apnea by producing excess red blood cells, a condition called secondary polycythemia.
What proves it
Complete blood count (CBC) labs showing elevated hematocrit/hemoglobin; hematologist or pulmonologist nexus letter connecting hypoxia to erythrocytosis.
The rule VA applies
38 CFR § 3.310 covers secondary service connection two ways: a condition caused by a service-connected disability, and one aggravated by it beyond its natural progression. Either route works, and a claim can argue both. The standard is “at least as likely as not” — a 50% probability, not proof beyond doubt.
You do not need to show polycythemia began during service. That is what makes a secondary claim different, and it is the step most veterans do not realise is available to them.
What this becomes
Build the documents for this claim
Tell us what's going on in your own words and we'll draft the nexus letter for your provider to review and sign, plus your personal statement and buddy statements.
Obstructive sleep apnea DC 6847
This claim needs: a nexus opinion.
- 1 · The diagnosisOn record — the VA already conceded it
- 2 · What happened, and how it affects youYour statement · daily life · a witness
- 3 · The link to your serviceReady to draft — this answers the denialDraft it →
How VA rates it — your records document the 50% level.
“Patient uses CPAP nightly, compliance 92% of nights.” — sleep study, p. 3
A demo claim, not a customer's — every claim is laid out this way. VA decides every claim.
Straight answers
Common questions
- Can Polycythemia be service-connected as secondary to Sleep Apnea?
- It can be claimed that way. Under 38 CFR § 3.310, a condition that is proximately due to — or aggravated by — an already service-connected disability can itself be service-connected. Whether VA grants it depends on the evidence in your file, and the decision is made solely by VA adjudicators.
- What is the medical link between Sleep Apnea and Polycythemia?
- The body compensates for chronic low oxygen from apnea by producing excess red blood cells, a condition called secondary polycythemia.
- What evidence do I need?
- Complete blood count (CBC) labs showing elevated hematocrit/hemoglobin; hematologist or pulmonologist nexus letter connecting hypoxia to erythrocytosis.
- Do I need a nexus letter for a secondary claim?
- In most cases yes. The rater needs a medical opinion connecting the two conditions at the "at least as likely as not" (50% or greater) standard. That opinion has to come from a licensed clinician who reviews your records and signs it — a draft is a starting point for that provider, not a substitute for their judgment.
Keep going
Other conditions secondary to Sleep Apnea
Veterans rated for Sleep Apnea often have more than one of these.
Rated for more than Sleep Apnea?
Pick what you're rated for → see what commonly follows.
The free finder maps the secondary conditions that commonly follow every condition you already have — not just this one. No sign-up to look.
Start with the records you have.
Upload what you've got. We'll show you what it proves for Polycythemia and what to do next.
This page explains how a secondary claim works. It is not medical or legal advice, and it is not a prediction about your claim — service connection and any rating are decided solely by VA adjudicators. VA Claim Commander is not affiliated with the U.S. Department of Veterans Affairs.