Secondary service connection
Sleep apnea secondary to a knee condition: BVA grant rates and what wins
From 2017 to 2026, the Board of Veterans' Appeals decided sleep apnea claimed as secondary to a knee condition in 1,084 decisions. It granted the issue in 45.9% of them, above the 26.4% grant rate for all sleep apnea issues, denied it in 9.6%, and remanded it in 43.6%. Counting only decisions on the merits, 82.7% were granted.
Decisions
1,084
2017–2026
Granted
45.9%
All sleep apnea: 26.4%
Granted on the merits
82.7%
Granted ÷ (granted + denied)
Remanded
43.6%
Denied: 9.6%
How VA rates sleep apnea
Once service connection is granted, VA assigns a disability rating from the rating schedule: 38 CFR 4.97, diagnostic code 6847 (Sleep Apnea Syndromes (Obstructive, Central, Mixed)). The rating is the same whether the condition is service connected directly or as secondary to another disability.
| Rating | Criteria |
|---|---|
| 100% | Chronic respiratory failure with carbon dioxide retention or cor pulmonale, or; requires tracheostomy |
| 50% | Requires use of breathing assistance device such as continuous airway pressure (CPAP) machine |
| 30% | Persistent day-time hypersomnolence |
| 0% | Asymptomatic but with documented sleep disorder breathing |
Text of 38 CFR 4.97 as of Feb 27, 2026. Confirm the current text at the source before relying on it.
See all sleep apnea decisions, direct and secondary.
Sleep apnea secondary to a knee condition: outcomes by year
| Year | Issues decided | Granted | Denied | Remanded | Other |
|---|---|---|---|---|---|
| 2018 | 33 | 36.4% | 18.2% | 45.5% | 0.0% |
| 2019 | 72 | 33.3% | 13.9% | 51.4% | 1.4% |
| 2020 | 77 | 36.4% | 11.7% | 51.9% | 0.0% |
| 2021 | 78 | 24.4% | 6.4% | 69.2% | 0.0% |
| 2022 | 73 | 23.3% | 16.4% | 57.5% | 2.7% |
| 2023 | 110 | 42.7% | 10.0% | 46.4% | 0.9% |
| 2024 | 237 | 51.5% | 6.8% | 41.4% | 0.4% |
| 2025 | 321 | 59.8% | 8.7% | 30.8% | 0.6% |
| 2026 | 76 | 52.6% | 5.3% | 42.1% | 0.0% |
Each row counts issues (each condition the Board decided), so the shares add up to 100%. Other: dismissed, withdrawn or no clear outcome. Years with fewer than 20 issues are left out.
Evidence in granted and denied sleep apnea decisions
For each kind of supporting evidence: how often the Board granted the sleep apnea issue on the merits when the decision mentioned it, compared with decisions that did not. These are associations, not causes, and evidence is recorded per decision, not per issue.
| In the record | Decisions | Granted when present | When absent | Difference |
|---|---|---|---|---|
| Positive nexus opinion | 546 | 95.1% | 40.9% | +54.2 pts |
| Private medical opinion | 695 | 88.8% | 50.0% | +38.8 pts |
| Favorable VA exam | 87 | 89.0% | 81.9% | +7.2 pts |
| Buddy statement | 50 | 69.2% | 83.3% | −14.1 pts |
| Lay statement | 762 | 77.9% | 93.9% | −16.0 pts |
- The Board applied the benefit-of-the-doubt rule (38 CFR 3.102) in 71.9% of the decisions that granted sleep apnea.
- The Board found the veteran's statements credible in 17.1% of grants and 10.6% of denials.
Negative evidence in the record
An unfavorable exam or a negative nexus opinion often sits in the same record as favorable evidence, and the Board weighs them against each other. So these rows show how often sleep apnea was still granted when the record contained the negative item, not that the item helped.
| In the record | Decisions | Granted when present | When absent | Difference |
|---|---|---|---|---|
| Negative nexus opinion | 787 | 80.5% | 90.0% | −9.5 pts |
| Unfavorable VA exam | 871 | 80.5% | 92.7% | −12.2 pts |
How these claims are argued
A secondary claim says a knee condition caused sleep apnea or made it worse, and names how. Below: whether the Board's decision discussed aggravation, and the medical link each decision names, with how often those issues were granted.
Aggravation discussed
made worse by the disability, 3.310(b)
36.0%
granted, of 445 issues (40.9% of all)
Causation only
caused by the disability, 3.310(a)
53.0%
granted, of 644 issues (59.1% of all)
| Medical link named | Issues | Granted |
|---|---|---|
Weight gain or obesity Granted “Obesity noted as intermediate step between service-connected conditions and OSA.” 26001800 (2026) Denied “Veteran's theory of weight gain as intermediate step is speculative.” A26008466 (2026) | 833 | 50.5% |
Reduced activity or mobility Granted “Opinion noted Veteran's obesity, chronic pain, limited mobility, and PTSD medication causing weight gain.” A26001655 (2026) Denied “No persuasive evidence linked OSA to service-connected knee disability or inactivity caused by it.” A25002278 (2025) | 117 | 68.4% |
Sleep disruption Granted “Private opinion found it at least as likely as not that knee disability caused sleep impairment and obesity, contributing to sleep apnea.” A26008821 (2026) Denied “Veteran's testimony indicated no sleep problems during service..” 25005229 (2025) | 78 | 42.3% |
Chronic pain Granted “Opinion noted Veteran's obesity, chronic pain, limited mobility, and PTSD medication causing weight gain.” A26001655 (2026) Denied “Veteran remained active post-service and did not report knee pain interfering with exercise.” A25008143 (2025) | 69 | 63.8% |
Nerve involvement Granted “Service-connected disabilities (fibromyalgia, cervical degenerative arthritis, lumbar radiculopathy, lumbar degenerative arthritis, right knee degenerative arthritis) met.” 26001800 (2026) Denied “The veteran claimed service connection for obstructive sleep apnea (OSA), asserting it was secondary to his service-connected adjustment disorder, musculoskeletal conditions, and radiculopathy.” A25034107 (2025) | 42 | 61.9% |
Medication side effects Granted “Cited weight gain from inactivity and NSAID use as contributing factors” A25015945 (2025) Denied “The veteran claims service connection for sleep apnea, asserting it is due to medication used to treat service-connected back and knee disabilities.” 21005396 (2021) | 28 | 57.1% |
Based on words in the AI-written summary and reasons for each issue, not a reading of the full decision. 82.2% of the 1,089 issues name at least one medical link; the rest only say “secondary to” the disability. One issue can name several links. Granted is the share of those issues granted (remands count as not granted). A link named in a denial was often the argument the Board rejected.
Why the Board granted or denied sleep apnea
Most common reasons in grants
- Caused by the service-connected disability118
- Service connection established68
- Current diagnosis established45
- Aggravated by the service-connected disability22
- VA examiner: less likely than not related to service11
- Obesity as intermediate step6
- Private medical opinion found probative4
- Conflicting medical opinions regarding nexus4
Most common reasons in denials
- VA examiner: less likely than not related to service19
- No in-service complaints, treatment or diagnosis14
- Caused by the service-connected disability13
- Service records negative or silent12
- Aggravated by the service-connected disability6
- Preponderance of the evidence against the claim6
- Current diagnosis established4
- Service connection established4
Numbers are decisions that gave the reason. Reasons are short phrases extracted by AI from each decision; common wordings of the same reason are grouped. Benefit of the doubt is reported above.
Recent sleep apnea decisions
Granted
Private medical opinion linked weight gain to service-connected knee/ankle conditions; Weight gain identified as intermediate step to OSA; Evidence in relative equipoise, doubt resolved in Veteran's favor
Favorable opinions found knee disability aggravated obesity, which caused sleep apnea.; Negative opinions did not adequately address obesity as an intermediate step.; Evidence found in equipoise, with doubt resolved in veteran's favor.
Sleep apnea rated under DC 6847 for use of CPAP machine.; Spicer v. McDonough precedent applied to secondary service connection.; Board resolved reasonable doubt in Veteran's favor for 50% rating.
Denied
Conflicting medical opinions regarding OSA etiology.; Board found VA examiners' opinions more probative than private opinion.; Lack of in-service documentation of OSA symptoms.; Significant delay between service and diagnosis.; OSA has a known etiology, precluding presumptive service connection as MUCMI.
No evidence of current disability; No nexus to service or service-connected disability; No pre-decisional duty to order VA exam; No evidence submitted for secondary claim
November 2023 VA exam found OSA not directly related to service, noting lack of in-service complaints and suggesting post-service factors.; Examiner noted Veteran's assertion of weight gain from knee injury causing OSA but cited other weight management options.; December 2023 VA exam found OSA unrelated to knee disability due to separate medical mechanisms and lack of supporting literature.; July 2024 VA exam found OSA unrelated to knee disability or obesity, citing multifactorial causes and passage of time since service.; Board found VA opinions adequate, considering Veteran's contentions but ultimately finding no basis for nexus.
What VA needs to grant a secondary claim
Secondary service connection means VA disability benefits for a condition caused or made worse by a disability that is already service connected (38 CFR 3.310). The claim needs three things:
- A current diagnosis of sleep apnea.
- A knee condition is already service connected.
- Medical evidence linking them (a nexus opinion): sleep apnea was caused by a knee condition (3.310(a)), or was made worse beyond its natural progress by it (aggravation, 3.310(b)).
VA's procedures for these claims are in M21-1 V.ii.2.D. When the evidence for and against is about even, VA must decide in the veteran's favor (38 CFR 3.102).
Other conditions secondary to a knee condition
- Major depressive disorder secondary to a knee condition512 decisions · 49.4% granted
- Osteoarthritis secondary to a knee condition535 decisions · 34.2% granted
- Degenerative arthritis of the spine secondary to a knee condition2,449 decisions · 24.1% granted
- Intervertebral disc syndrome secondary to a knee condition1,760 decisions · 19.7% granted
- Hip impairment secondary to a knee condition2,665 decisions · 19.0% granted
- Ankle impairment secondary to a knee condition952 decisions · 15.2% granted
- Shoulder impairment secondary to a knee condition426 decisions · 15.0% granted
- Cervical spine limitation of motion secondary to a knee condition396 decisions · 10.6% granted
- Thoracolumbar or lumbar spine limitation of motion secondary to a knee condition636 decisions · 8.6% granted
- Foot impairment secondary to a knee condition445 decisions · 8.3% granted
Sleep apnea secondary to other conditions
- Sleep apnea secondary to a back condition1,166 decisions · 38.2% granted
- Sleep apnea secondary to a psychiatric disorder4,474 decisions · 33.1% granted
- Sleep apnea secondary to PTSD11,479 decisions · 31.7% granted
- Sleep apnea secondary to diabetes994 decisions · 23.0% granted
- Sleep apnea secondary to tinnitus632 decisions · 20.7% granted
- Sleep apnea secondary to hypertension692 decisions · 14.6% granted
See all conditions secondary to a knee condition or sleep apnea as a primary or secondary condition.
Rules that apply to secondary sleep apnea claims
- 38 CFR 3.310
Secondary service connection and aggravation
Read it in VA Law Explorer - M21-1 V.ii.2.D
Secondary service connection and aggravation of non-service-connected disabilities
Read it in VA Law Explorer - 38 CFR 3.102
Reasonable doubt (benefit of the doubt)
Read it in VA Law Explorer - 38 CFR 4.97 · DC 6847
Schedule of ratings: respiratory system
Read it in VA Law Explorer - M21-1 IV.i.3.B.1.l
Reviewing a sleep disorders examination
Read it in VA Law Explorer
Research your sleep apnea case
Narrow by year, judge, evidence or secondary condition, read the decisions, and export a research memo.
How these numbers are calculated
- Counts decisions in which the Board decided a sleep apnea issue claimed as secondary to a knee condition, by the outcome of that issue.
- The primary disability is read from the decision text ("secondary to …") and grouped by name, so spellings such as "PTSD" and "posttraumatic stress disorder" count together.
- Secondary claims also include aggravation of a non-service-connected condition by a service-connected one (38 CFR 3.310(b)).
- The data comes from CaseScribe's AI extraction of public BVA decisions (2017–2026) and can contain errors. It is updated automatically as new decisions are added.