Sleep Apnea Secondary to Depressive Disorder Claim Guide

We analyzed the Board's published decisions and found sleep apnea (DC 6847) claimed as secondary to depressive disorder (DC 9435) is a real, mid-sized claim pool that wins clearly more often than it loses once it reaches a merits decision.

How those 316 issues came out

The ICD-10 diagnosis codes most commonly used for DC 6847, Sleep Apnea (the kind on your medical records, decision letter, or C&P exam report). VA rates the disability and its residuals, not the diagnosis itself, so coding can vary.

See the full diagnostic-code page →

Under 38 CFR 3.310 a secondary claim turns on three elements:

• A current diagnosis: a medical diagnosis of sleep apnea (the secondary).
• A service-connected primary: Depressive Disorder, already service-connected (the primary). A 0% primary still counts.
• A medical nexus: a medical opinion linking the sleep apnea to the depressive disorder, showing the primary caused or aggravated it.

See the Secondary Claim guide for the caused-versus-aggravated split, and the Nexus Letter guide for what makes the medical opinion strong.

Whether that medical link exists in any one case is a medical question decided on that case's own evidence (the nexus).

The outcome split above counts whole issues. This section goes one layer deeper. Under 38 CFR § 3.310 a secondary claim can be won two ways: the depressive disorder caused the sleep apnea (§ 3.310(a)), or it aggravated an existing sleep apnea (§ 3.310(b)). Every grant rests on one or the other, so the numbers below divide up the granted claims only.

Direct causation is the route that carries most grants here: 83% of them found the depressive disorder caused the sleep apnea, the rest found aggravation. A practical consequence for the nexus opinion: it should address both routes, because a medical opinion that only argues causation leaves the aggravation theory, a separate legal basis, on the table. See the caused-vs-aggravated guide for how the two theories differ.

On the other side: in 17 denied claims the Board looked at this pairing and found no link, meaning it decided the depressive disorder neither caused nor worsened the sleep apnea. That is a separate group from the grants above, counted here so the picture is not one-sided.

We analyzed published Board decisions on this pairing to build this split. The grant split covers granted claims only; denied, remanded, and dismissed claims are not in it. Descriptive of the published record, not a prediction.

In some findings on this pairing, the Board did not connect sleep apnea to depressive disorder directly. It named a middle step: depressive disorder caused something else first, and that something caused the sleep apnea. That is the two-hop chain pattern explained in the causation chains guide. Counts are a floor from the decisions we have on file, not a total and not a success rate.

• Obesity / weight gain: named as the middle step in 17 Board findings on this chain (example: decision A22009837).

The middle step is a medical question a doctor has to answer with a reason at each link. See nexus letters for what that opinion covers.

The record VA actually reviews centers on a small set of documents. We analyzed published Board decisions on these claims and ranked the records that appeared most often:

• A medical nexus opinion: the one record VA weighs most on a secondary claim, a doctor's statement linking your sleep apnea to your service-connected depressive disorder and naming the mechanism.
• Sleep study (polysomnography) in the file
• CPAP prescribed or recommended
• Witness statements on snoring or stopped breathing
• In-service fatigue, snoring, or daytime sleepiness
• Weight gain documented during or since service

The diagnostic code involved: DC 6847 (Sleep Apnea). The rating levels for this code are in the rating section below.

Records ranked by how often published Board decisions cited them. The exam that captures most of this is covered in the C&P Exam section below. Source: Board of Veterans' Appeals decisions, RateMyVSO analysis.

What veterans who win this pairing actually put in the file, and why each piece moves the claim.

• Sleep study (polysomnography): This is the test that proves you actually have sleep apnea, not just poor sleep. It measures how often your breathing stops (the AHI number) and how far your oxygen drops. Without it, VA has no proof the condition exists.
• Your depression rating decision: Get the paperwork showing your depressive disorder is already service connected, at any percentage. Secondary claims only work if the first condition is already on the books.
• Weight records from before and after your depression started: This is the heart of the claim. Depression often drives overeating and appetite changes that pack on weight, and even a modest weight gain sharply raises sleep apnea risk. Pull weigh-ins from your medical file that show the timeline: depression first, weight climbing, then apnea diagnosed.
• Medication list from your depression treatment: Some antidepressants, sedatives, and anti-anxiety drugs cause weight gain or relax the throat muscles that keep your airway open at night. If you take any of these, list them by name. This gives your doctor a second, separate mechanism to point to besides weight.
• CPAP prescription and titration study, plus a Sleep Apnea DBQ: These show how bad the apnea actually is and that you're being treated for it. A filled-out DBQ with real detail on how often you stop breathing, how many times you gasp awake, and your CPAP settings carries far more weight than a checklist with boxes ticked and nothing written in.
• Statements from your spouse or someone who has watched you sleep: Loud snoring, gasping, choking sounds, breathing pauses. A family member's account helps pin down when the apnea actually started, which matters for proving depression came first.
• A nexus letter that explains HOW, not just THAT: The single biggest reason these claims get denied is a letter that names both conditions but never connects them. Your doctor needs to say sleep apnea is "at least as likely as not" caused by your depression, and then walk through the actual mechanism, the weight gain, the medication, or the way depression disrupts the brain's control of breathing during sleep. A letter that treats the two conditions as just "commonly seen together" will not survive review.
• A doctor who has treated you over time, not a one-time exam: A nexus opinion from the provider who watched your depression worsen and your weight climb over months or years carries more credibility than a single visit with someone meeting you for the first time. If your longtime provider can write the letter, use them.

The five decisions below all granted service connection for sleep apnea (DC 6847) as secondary to a service-connected depressive disorder (DC 9435). In each case, the Board found that the depressive disorder, often acting through weight gain or obesity, was at least as likely as not a cause of the veteran's sleep apnea. Board decisions are not binding precedent, and each case turned on its own medical evidence.

The VA assigns one of these percentages based on what your medical record documents. Plain-language summary of the rating criteria at 38 CFR; the controlling text is the regulation itself.

Every item below comes from a pattern in the decisions on this pairing, not from general claim advice.

For the mechanics of filing itself, see the Standard Claim Guide and the Fully Developed Claim Guide.

A secondary claim moves through the same pipeline as any other. Understanding who does what helps you know who to contact and what to expect.

1. You file the claim, naming Depressive Disorder as the service-connected primary and sleep apnea as secondary. Directly with VA, through VA.gov, or with an accredited representative's help.
2. VA assigns a Veteran Service Representative (VSR) to develop the claim: gather your service treatment records, VA and private medical records, and order a C&P exam if needed.
3. The C&P exam is conducted, usually with the examiner asked to address the specific secondary theory (causation and aggravation both).
4. The file goes to a Rating Veteran Service Representative (RVSR), the "rater," who weighs the medical evidence and decides service connection and, if granted, the rating percentage.
5. VA issues the decision letter stating the outcome and the reasoning.
6. If denied or under-rated, you choose an appeal lane, Supplemental Claim, Higher-Level Review, or a Board appeal, covered below.

Who's who: VSO vs. VSR vs. Rater vs. C&P Examiner

For the full walkthrough, see Inside Your Claim and Claim Stages.

A Disability Benefits Questionnaire (DBQ) is the standardized form the examiner completes for your condition. See the DBQ Guide for how these forms work and whether a private DBQ from your own doctor can be submitted instead of relying solely on a VA exam. For what to expect and how to prepare, see the C&P Exam Prep Guide, and be specific about how your sleep apnea symptoms relate to your depressive disorder timeline, treatment, and any aggravation, that is the detail a nexus opinion relies on.

Your decision letter has a narrative "reasons and bases" section and a codesheet with the rating and effective date. See the Reading Your Decision Letter Guide or use the Letter Interpreter tool to decode your own letter. If denied, you have three main lanes:

• Supplemental Claim: refile with new and relevant evidence, such as a nexus opinion that addresses the mechanism and the specific VA rationale you're rebutting. See Supplemental Claim Guide.
• Higher-Level Review (HLR): a senior reviewer looks at the same evidence again, useful if the denial rested on a legal error. See HLR Guide.
• Board Appeal: your case goes to a Veterans Law Judge, with a direct review, evidence, or hearing docket. See Board Appeal Guide.

Not sure which lane fits? See the Appeals decision guide for a side-by-side comparison.

Keep documentation of ongoing treatment, follow-up evaluations, and any updated diagnostic testing for your sleep apnea on file, this protects you if VA schedules a future reexamination. See Protect Your Rating for when a rating becomes protected and Future Reexaminations for what triggers one. If your sleep apnea worsens, see the Rating Increase Guide.