Independent Medical Opinion / Nexus Letter

A nexus letter is a written medical opinion from a licensed healthcare provider that establishes a connection between your current disability and your military service. The term "nexus" means "link." It is one of the three elements required for VA service connection: (1) an in-service event, (2) a current diagnosed disability, and (3) a medical nexus linking the two. At Military Disability Nexus, every nexus letter meets the standard of a comprehensive IMO with detailed evidence-based rationale.

The VA denies thousands of claims each year citing “no nexus established” or “insufficient medical evidence.” Even when a veteran has a clear diagnosis and documented in-service events, the VA requires a medical professional to explicitly state the connection between the two. A C&P examiner’s negative opinion can derail an otherwise strong claim. A well-written private nexus letter provides an independent, evidence-based counter-opinion that the VA must consider alongside the C&P exam. Under 38 CFR §3.159(a)(1), private medical opinions are competent medical evidence, and the VA cannot reject them solely because a veteran paid for them.

Yes. A secondary service connection nexus letter explains how a new disability was caused by or aggravated by a condition already service-connected through the VA. For example, if you are service-connected for PTSD and develop sleep apnea, a nexus letter can establish the medical link through mechanisms like weight gain, medication side effects, and autonomic nervous system disruption. Secondary claims are among the most common and successful VA claims.

Every nexus letter at Military Disability Nexus is written by a board-certified physician whose medical specialty matches the condition being claimed. For PTSD, anxiety, or depression claims, a psychiatrist or clinical psychologist writes the opinion. For musculoskeletal conditions like back or knee injuries, an orthopedist or physiatrist is assigned. For internal medicine conditions like hypertension, diabetes, or GERD, an internist prepares the letter. This specialty matching is essential because the VA assigns the highest probative weight to opinions from physicians who are experts in the relevant medical field.

Yes. Under 38 CFR §3.159(a)(1), the VA defines competent medical evidence as including statements from a private physician or other qualified medical professional. The Supreme Court and the Court of Appeals for Veterans Claims have repeatedly held that the VA cannot reject a private medical opinion solely because the veteran paid for it. The VA must weigh private medical evidence on its merits — the quality of the reasoning, the accuracy of the factual foundation, and the qualifications of the provider — not on whether the opinion came from VA or a private source.

Almost any current diagnosed disability can potentially be supported by a nexus letter, provided there is a plausible medical basis for connecting the condition to military service. Common conditions include PTSD, anxiety, depression, sleep apnea, tinnitus, hearing loss, back and spine conditions, knee injuries, migraines, GERD, IBS, hypertension, respiratory conditions (including burn pit and PACT Act claims), skin conditions, cardiovascular disease, and many more. If you are unsure whether your condition qualifies, our free consultation can help you determine the best path forward.

A C&P (Compensation and Pension) exam is conducted by a VA-contracted examiner who evaluates your condition and provides a medical opinion to the VA. You do not choose the examiner, and the exam is typically 20–45 minutes. A nexus letter is an independent medical opinion from a private physician that you commission to support your claim. Private nexus letters are typically more thorough, include detailed medical literature citations, and are written by specialty-matched physicians. Both carry evidentiary weight, and the VA must consider both when making its decision.

A nexus letter is one of the most effective pieces of new and relevant evidence when filing a Supplemental Claim after a denial. If the denial was based on a negative C&P exam opinion, a well-reasoned private nexus letter that addresses the C&P examiner’s errors can shift the balance of evidence in your favor. The VA must give equal initial consideration to private medical opinions and C&P exam opinions under the benefit-of-the-doubt rule (38 CFR §3.102).

Standard turnaround is 7–10 business days from the date we receive all required records and complete your clinician consultation. Rush delivery is available within 48–72 hours for an additional fee. Turnaround times depend on claim complexity and the completeness of medical records provided.

We need your service treatment records (STRs), post-service medical records relevant to the claimed condition, any VA rating decision letters or denial letters, prior C&P exam reports (if applicable), and a completed intake form describing your in-service events and current symptoms. If you are missing records, we can guide you on how to obtain them through the VA or other sources.

No provider can ethically or legally guarantee a VA claim outcome. The VA’s decision depends on the totality of the evidence, the specific facts of your case, and the adjudicator assigned to your claim. What we guarantee is that your nexus letter will be thorough, evidence-based, clinically sound, and written in VA-compliant language by a qualified, board-certified physician. Our goal is to give your claim the strongest possible medical foundation