Will an AI-Generated Nexus Letter Get My VA Disability Claim Denied?

Yes, it is possible that an AI-generated nexus letter could lead to a veteran’s disability claim being delayed or denied. One reason is that artificial intelligence cannot supply the kind of record-specific medical judgment that the Department of Veterans Affairs (VA) currently looks for in a nexus opinion.

In this article, you will learn about the risks involved in using AI for nexus letters and throughout the VA claims process as a whole, including when AI may be appropriate to use and when it may not.

Key points of this article include:

• VA generally requires nexus letters to qualify as “competent medical evidence” under 38 CFR § 3.159(a)(1), meaning the opinion must come from a person qualified through education, training, or experience.
• Case law from the U.S. Court of Appeals for Veterans Claims (CAVC) holds that most of a medical opinion’s probative value comes from its reasoning, not its conclusion.
• AI tools can still help veterans prepare their claim in several legitimate ways, just not by replacing an actual medical opinion.

Watch CCK Law Partner and former Veterans Law Judge Bradley Hennings explain why AI-generated nexus letters can get a claim denied:

Does VA Accept AI-Generated Nexus Letters as Competent Medical Evidence?

While no regulation expressly forbids VA from accepting AI-generated nexus letters, VA often will not recognize these letters as competent medical evidence. This is partly because, under 38 CFR § 3.159(a)(1), competent medical evidence generally must come from a person who is qualified through education, training, or experience to offer a medical diagnosis or opinion, criteria AI programs do not satisfy.

Additionally, AI-generated letters often neglect to include the case-specific details and medical judgments that VA typically looks for in nexus letters.

“VA does not weigh a medical opinion by how confident it sounds. It weighs the reasoning behind it,” says Bradley Hennings, partner at CCK Law and former Veterans Law Judge. “The Court of Appeals for Veterans Claims said this plainly in a case called Nieves-Rodriguez v. Peake. The Court held that, quote: ‘Most of the probative value of a medical opinion comes from its reasoning.’”

Specifically, VA’s Adjudication Procedures Manual (M21-1) indicates that a persuasive medical rationale should do three things:

• Cite the general medical principles that it relies on
• Clearly identify the case facts and specific evidence it is based on
• Show how the veteran’s medical provider reached their conclusion

While an AI nexus letter may sound reasonably competent and medically sound, the AI tool typically will not be able to review a veteran’s specific treatment records, conduct a clinical evaluation of the veteran’s symptoms, or apply independent medical judgement.

Even a signature from a medical provider usually will not fix this information gap, since the provider did not do the reviewing and reasoning themselves.

For example, a few conditions that AI might have trouble generating nexus letters for include:

• Migraines — VA rates migraines based on the frequency and severity of “prostrating attacks” and their effect on the veteran’s ability to work. Confirming that pattern takes clinical documentation built over multiple visits with a treating provider, which an AI system cannot replicate.
• PTSD and military sexual trauma (MST) — PTSD claims require in-service stressors, with the evidence required to prove these stressors changing depending on the veteran’s specific claim. For instance, under 38 CFR § 3.304(f)(5), PTSD claims for MST allow for indirect “markers” to corroborate the existence of a stressor, since formal reports often do not exist. Correctly interpreting these markers requires a clinician who has reviewed the veteran’s service and treatment records.
• Orthopedic and joint conditions — Under DeLuca v. Brown, 8 Vet.App. 202 (1995), VA must consider functional loss from pain, weakness, fatigability, and flare-ups when rating an orthopedic condition, rather than just a single day’s range-of-motion measurement. Applying that standard usually takes a physical exam and clinical judgement regarding how the joint performs on a bad day, something AI cannot generate on its own.

“As a Veterans Law Judge [before AI], I used to read these opinions every day,” says Hennings. “The strong ones did the work. They demonstrated a real examination, a careful review of the record, and reasoning I could follow. But the weak ones announced themselves, too: the same sentence structures, the same boilerplate, a conclusion that could have been pasted onto any claim with that diagnosis from a provider who never examined or really knew the veteran’s record.”

Watch VA-Accredited Claims Advocates Alex Cerrone, Brandon Paiva, and Nicholas Briggs discuss what should be included in your VA nexus letter:

What Other Risks Are There To Using AI-Generated Nexus Letters?

Beyond the risk of a denial, veteran AI nexus letters risk creating more problems that can negatively impact the veteran’s life and disability claim. These include:

• Damaged credibility — If VA reviews a letter and finds inaccurate or unsupported information in it, that can hurt the veteran’s credibility with the adjudicator deciding the rest of their case.
• Exposure of personal information — Many AI programs have questionable information security. This means veterans should be cautious about entering personal medical information, service history, or contact details into a public AI platform, since that information could potentially be exposed or misused.
• Getting flagged by VA fraud tools — AI-generated letters often contain characteristics that VA’s new fraud-detection tool is designed to flag. Even though it is not prohibited to submit an AI nexus letter, being flagged by VA’s systems may still lead to a claim being slowed down or delayed. Veterans should keep in mind, however, that VA’s fraud-detection tool is designed to detect fraud in medical questionnaires, not nexus letters specifically.

Will VA’s 2026 Fraud Detection Tool Flag AI-Generated Letters or DBQs?

While VA’s new fraud-detection tool was not necessarily built to catch AI-generated content, it searches for many of the same patterns that AI-generated letters tend to produce, which could increase the risk of a veteran’s claim being flagged for review.

“VA has built a tool to detect fraud in medical questionnaires, one that searches for patterns like boilerplate language, templated phrasing, and the same wording showing up across different claims,” says Bradley Hennings. “AI-generated letters tend to look exactly like that, and a flag from the tool can trigger a new examination that potentially changes a veteran’s rating.”

VA has said that this tool will be forward-looking only. It is meant to screen newly submitted Disability Benefits Questionnaires (DBQs) going forward, not to reopen claims that have already been decided.

When Could AI Be Helpful in Preparing a VA Claim?

While veterans should generally avoid AI for producing nexus opinions, there are still parts of the VA claims process where AI tools might come in handy. These include:

• Organizing evidence — AI can help a veteran outline their claim, organize their records, and review pieces of evidence like lay statements for spelling and grammar.
• Preliminary research — AI can help a veteran do quick research on either their condition or the VA claims process itself. However, they should be sure to verify AI-provided information against a trusted source, such as VA’s own website or an accredited representative, before it is relied on.
• Drafting personal statements — AI can sometimes help veterans draft personal statements if they are not comfortable writing. However, it is important for the veteran to carefully review and edit such a statement for accuracy and tone.
• Interpreting VA correspondence — AI can help a veteran make sense of confusing terms used on official VA documentation, such as reduction proposals or decision letters. However, this should not replace a conversation with an accredited representative about what documents may mean for a disability claim.

What Are the Benefits of an AI-Written Letter vs. a Medical Practitioner-Written Letter?

While AI-generated nexus letters are often faster and cheaper to obtain, these advantages tend to come at the expense of the factors VA actually weighs when it decides how much a nexus opinion is worth.

The table below compares veteran AI nexus letters with practitioner-written letters, weighing the pros and cons across the factors that matter most to a VA disability claim.

Category	AI-Generated Nexus Letter	Practitioner-Written Nexus Letter
Speed	Produced almost instantly	May take days or weeks to schedule and complete
Cost	Free or low-cost	Typically more expensive (often $500 to $3,000 or higher, depending on the condition)
Clinician review of records	Typically not based on the veteran’s actual claims file	Ideally based on direct review of the veteran’s specific medical records
Medical rationale	Often generic or templated	Reasoned and specific to the veteran’s condition
Conclusion consistent with reasoning	May state a conclusion without supporting analysis	Conclusion follows from the medical rationale the provider gives
Risk of triggering VA’s fraud-detection tool	Higher — often contains boilerplate or templated language	Lower — reflects the provider’s own language
Handling of personal medical information	Entered into a third-party AI platform	Handled under standard medical privacy practices
Ability to conduct a physical examination	Not possible	Possible, when the condition requires one
Accountability for follow-up questions	Limited — signing provider may not be able to defend reasoning they did not generate	Provider can clarify or supplement the opinion directly
Risk of factual errors specific to the record	Higher — not generated from the veteran’s actual claims file	Lower — based on direct review of the file
Overall likelihood of meeting VA’s “competent medical evidence” standard	Lower	Higher

Because VA weighs a nexus opinion by these factors rather than by how it was produced, the extra time and cost of a practitioner-written letter is often what gives it real evidentiary value.

What Should I Do if My Nexus Letter Was Denied for Being AI-Generated?

Veterans whose nexus letters were denied for being AI-generated can appeal VA’s decision and potentially get VA to change its mind on service connection. There are three appeal pathways available to veterans:

• Supplemental Claim — New evidence (including new nexus letters) can be submitted for VA consideration.
• Higher-Level Review — A more senior VA employee reviews the claim as it is, with no new evidence being allowed.
• Hearing with the Board of Veterans’ Appeals (BVA) — The BVA hears the veteran’s claim and makes a decision.

Of these three, the Supplemental Claim pathway is the one that allows veterans to submit new evidence. Therefore, veterans looking to submit a new nexus letter for their appeal should likely choose that pathway.

Before veterans submit their appeal, however, they should consider taking the following steps to better the chances of their claim being approved by VA.

Step 1: Get a Real Medical Opinion

The first step to correcting a veteran’s AI nexus letter denial is to seek a legitimate nexus letter written by a medical provider.

“First suggestion, get a real medical opinion,” says Bradley Hennings. “That means a qualified provider who reviews your records, considers your history, and explains in their own words why your condition is connected to your service. That reasoning is what carries weight.”

Once the veteran has a qualified provider willing to write their nexus letter, they can move on to the next step.

Step 2: Make Sure the Letter Has What It Needs

After seeking out a legitimate medical opinion, veterans should sit down and review that letter carefully to ensure it contains the necessary information.

“Ask the physician or clinician who signs your opinion three questions,” says Hennings. “One: Did you personally review my records? Two: Can you explain this reasoning in your own words? Three: Did you actually examine me where that’s required? If the answer to any of these is no, that opinion may not carry the weight you are paying for.”

Step 3: Consider Accredited Representation

VA-accredited representation can be highly beneficial to veterans seeking help navigating their appeal. These representatives can take several forms, including VA-accredited attorneys, claims advocates, and Veterans Service Organizations (VSOs). Of these, VSOs will generally help veterans at no cost.

Whichever of these a veteran chooses, however, they should make sure that their representative is VA-accredited. Only those with VA accreditation are authorized to represent veterans, as they must work within professional rules and with real oversight.

Learn More About VA Disability Ratings and Appeals

Frequently Asked Questions

Can a doctor sign a nexus letter that ChatGPT wrote?

Yes, a doctor can sign a nexus letter that ChatGPT or another AI tool wrote. However, doing so does not guarantee VA will consider the letter. This is largely because a nexus letter’s value comes mainly from the specific medical reasoning behind it, which AI is not always able to formulate the way a treating provider can. In a case like this, veterans might be better suited if they had their doctor heavily edit or rewrite the letter to include their own medical rationale and reasoning, rather than simply signing it.

What is a VA nexus letter and why does it matter for a disability claim?

A VA nexus letter is a medical opinion (usually from a physician or other qualified medical provider) that connects a veteran’s current condition to their military service. This matters because service connection, one of the basic requirements for VA disability compensation, generally cannot be established without some form of medical evidence linking the condition to service.

Can I use AI to research my condition even if I cannot use it to write the letter?

Yes, there is nothing stopping a veteran from using AI to research their condition. An issue only potentially arises when that veteran submits AI-generated documents to VA as evidence. However, veterans who use AI for research should still double-check that information against a trusted source, since AI tools can often generate inaccurate or outdated information.

Can I resubmit a nexus letter claim after a denial tied to AI use?

Yes, veterans can file an appeal after this kind of denial. In most cases, this will need to be a Supplemental Claim, since that option allows a veteran to submit new evidence, such as a new nexus letter, along with their appeal.