Who Can Write a Nexus Letter for a VA Claim?

Quick answer

Who can write it. Any licensed medical professional with the training to answer the question. That means a physician, MD or DO, and the Court has held that a nurse practitioner can give a competent medical opinion too. The VA weighs a nexus letter by its reasoning and the records it rests on, not by the letters after the author's name.

Who writes it here. A physician, not a template or a mid-level network: Doug Mayeux, MD, MPH, board-certified in emergency medicine and a disabled veteran, licensed in Utah, Nevada, and Washington, license numbers and NPI on the About section. The rest of this post is about every other author you might use, and I am fair to them.

Who can't. You can't write your own nexus on a medical question that needs medical training. Your statement about what you saw and felt, and when, still counts, and a good letter is built on it.

What it costs. Free 15-minute screening call. $395 records analysis, which tells you in writing whether the records support a letter. $995 for a standard letter, with the $395 credited. $1,495 if the VA has already denied the condition or the claim is at appeal. No contingency, no percentage of back pay.

Where. Records-based, no exam, any state. Two to three weeks after the records are complete.

Start with the free screening call, or skip the call and go straight to the $395 analysis.

Who is allowed to write a nexus letter?

There's no rule that says only a doctor. A nexus letter is a medical opinion, and the VA accepts medical opinions from licensed medical professionals who are competent to answer the question asked. In practice that means physicians (MD or DO), nurse practitioners, physician assistants, and for mental health conditions, psychologists.

The Court of Appeals for Veterans Claims settled the nurse practitioner question in Cox v. Nicholson. The veteran argued that a VA exam done by a nurse practitioner didn't count because she wasn't a physician. The Court disagreed: a nurse practitioner who has completed medical education and training is competent to provide diagnoses, statements, and opinions. The same decision added a caution: the author's level of training, education, and experience is a factor the Board may weigh, as long as it explains why. The credential is not a bar and not a free pass. It's one factor.

What carries the weight is the work. In Nieves-Rodriguez v. Peake the Court called the author being suitably qualified and sufficiently informed "threshold considerations," then said that most of the probative value of a medical opinion comes from its reasoning. An earlier decision, Guerrieri v. Brown, put it as the examination, the physician's knowledge and skill in analyzing the data, and the conclusion reached. The real question isn't who is allowed to sign. It's who will review the records and reason through them.

What makes a nexus letter count, whoever signs it?

Three things, whoever the author is.

Reasoning. Stefl v. Nicholson is blunt: a mere conclusion by a medical doctor is insufficient. The opinion has to support its conclusion with an analysis the Board can weigh against contrary opinions. The Court listed what that analysis can cover: why the cited studies are persuasive or not, whether the veteran has other risk factors for the condition, and whether the condition showed up in an unusual way. A letter that skips those loses to the examiner's opinion by default.

Accuracy. Reonal v. Brown: an opinion based on an inaccurate factual premise has no probative value. One wrong date, one in-service entry the author never saw, and the whole letter can be set aside. The author doesn't need your entire claims file. Nieves-Rodriguez holds that claims-file review is not a requirement for a private opinion, and the Board can't prefer a VA opinion over yours just because the VA examiner had the file. But the author has to be informed, and that means reviewing what you send.

The right question. A direct claim under 38 CFR 3.303 asks whether the disease was incurred in service; 3.303(d) covers a disease first diagnosed after discharge when all the evidence shows it began there. A secondary claim under 38 CFR 3.310 asks whether a condition the VA has already service-connected caused this one, or under 3.310(b) made it worse, which needs a baseline in the records. The letter has to answer the question your claim actually raises, in the VA's standard of proof: at least as likely as not. A doctor who has never heard that phrase will write a kind letter that doesn't answer it.

Can I write my own nexus letter?

Not on the medical question. On what you lived through, yes, and it matters more than most veterans think.

The Federal Circuit in Jandreau v. Nicholson said lay evidence can be competent to establish a diagnosis when the condition is one a layperson can identify, when the person is reporting a diagnosis a clinician made at the time, or when their description of symptoms at the time supports a later diagnosis by a medical professional. The Court's own example was that a layperson can identify a broken leg but not a form of cancer. Whether a knee injury in service explains arthritis twenty years later is on the cancer side of that line. Your opinion on cause won't be found competent. A clinician has to supply that link.

Your description of events and symptoms is different. Buchanan v. Nicholson, also Federal Circuit, holds that competent lay evidence can be sufficient on its own, and that the Board can't call your statement not credible just because no medical record from the time backs it up. The limit is real: the Board can still weigh the absence of records and can discount a statement for delay, bias, or inconsistency. And 38 CFR 3.303(a) itself says service connection is decided on all pertinent medical and lay evidence. So write the statement: what happened, when, and what you noticed afterward. Then let the medical author interpret it. The buddy statement post covers how.

Can my VA doctor write a nexus letter?

They can. Nothing in the law stops a VA clinician from giving an opinion on service connection. Many won't, and some are told not to. I won't argue with that. Their job is to treat you, and an opinion on your claim puts them in a spot their employer didn't hire them for.

Two cautions if yours will. First, a treating doctor gets no automatic extra weight. Guerrieri said directly that the Court has not adopted a rule giving treating physicians' opinions greater weight. Second, the letter most VA doctors are willing to write is one sentence: "I believe this condition is service related." Under Stefl that's a conclusion without an analysis, and it carries little weight however well the doctor knows you. If your VA doctor will go further, review your service records, and explain the mechanism and the timeline, take it. Just ask for the reasoning, not the sentence.

Can my private doctor write one?

Yes, and if they'll do the work, they may be the best author you can get. They know your history and they've examined you.

The catch is time. A real nexus opinion means reviewing your service treatment records, your post-service records, and any VA exam or denial, then writing a reasoned explanation to a standard most doctors have never been taught. That's hours of work outside a fifteen-minute visit, and most practices can't absorb it. Many also hesitate because they don't know what the VA wants. A short script helps:

"I'm filing a VA disability claim for my [condition]. The VA needs a medical opinion on whether it's at least as likely as not that this condition is related to my service. I can bring my service treatment records and the VA's exam. Would you be willing to review them and write an opinion with your reasoning, or would you rather I get one from an outside physician?"

That last clause gives them a clean way out. If they say yes, bring the records and point them to the strong nexus letter post so they know what the letter needs to contain.

What about nexus letter companies?

Some are good and some are not, and the website rarely tells you which. Four differences matter.

Named author or anonymous network. Will they tell you, in writing, who will review your records and sign? A name you can look up, or "one of our licensed providers"? The signature is what the VA weighs.
Physician or mid-level. Both can be competent under Cox. The Board may still weigh training on a complex question, so know which you're paying for. The credentials post goes into this.
Records-based or template. Does the author review your records and write to your facts, or swap your name into paragraphs every client gets? Reonal and Stefl are why this matters. The template versus individualized post shows how to tell.
Flat fee or contingency. A fee tied to your back pay is a reason to look hard at the opinion's independence. The contingency versus flat rate post explains why I don't do it.

Does the doctor's specialty matter?

Sometimes. It depends on what kind of question the claim raises.

Most nexus questions are physiologic. Did a documented in-service injury lead to this joint disease? Did service-connected PTSD and its medications produce the weight gain that produced the sleep apnea? Did a service-connected condition drive the reflux or the hypertension? Those are questions about mechanism, timeline, risk factors, and what the records show. A qualified clinician who reviews the whole record and reasons from the published evidence can answer them, whatever the letters after the name or the specialty on the certificate. I write those.

A psychiatric diagnosis question is different. When the claim turns on whether the veteran meets criteria for PTSD, or on which mental health diagnosis is correct, the author should be a psychiatrist or psychologist. Cox lets the Board weigh the author's training, and on a diagnosis question that weighing is fair. I refer those veterans to a board-certified psychiatrist, and say so on the screening call.

How do I check whoever is going to sign?

Get a name, then spend ten minutes on the state medical board lookup, the NPI registry, and the specialty board's certification search. All free and public. The how to verify a nexus letter doctor post walks through all five checks with my own credentials as the worked example. A provider who won't give you the name hasn't earned the fee.

Getting a nexus letter

Who writes it here. I am a board-certified emergency physician and a disabled veteran, and I write every opinion myself, from your records, with the authorities and studies cited by name in the letter. My licenses in Utah, Nevada, and Washington and NPI are on the About section. Physiologic question, I take the case. Psychiatric diagnosis, I refer.

What I need from you. Your service treatment records, your post-service records, and any VA exam or rating decision on the condition. If you aren't sure the records support a letter, the $395 records analysis answers that in writing before you spend anything on a letter, and tells you what's missing.

What it costs. The screening call is free, 15 minutes with me. A standard letter is $995 with the full records review included, or $395 for a records analysis first and $600 for the letter after it. If the VA has already denied this condition, you are rebutting an adverse C&P opinion, or the claim is at appeal, it is $1,495. Each additional condition on the same records is $500. No contingency, no percentage of back pay, and the price is confirmed in writing on the call before you pay anything.

How to start. Request the free screening call. You tell me the condition and where the claim stands, and I tell you honestly whether a nexus opinion is likely to help and whether I'm the right author. Records come later, through a secure link, never by email. No outcome is guaranteed. If the records do not support the claim, I will tell you that instead of writing the letter.

Authorities referred to in this post

Cox v. Nicholson, 20 Vet. App. 563 (2007).
Nieves-Rodriguez v. Peake, 22 Vet. App. 295 (2008).
Guerrieri v. Brown, 4 Vet. App. 467 (1993).
Stefl v. Nicholson, 21 Vet. App. 120 (2007).
Reonal v. Brown, 5 Vet. App. 458 (1993).
Jandreau v. Nicholson, 492 F.3d 1372 (Fed. Cir. 2007).
Buchanan v. Nicholson, 451 F.3d 1331 (Fed. Cir. 2006).
38 C.F.R. § 3.303, Principles relating to service connection.
38 C.F.R. § 3.310, Disabilities that are proximately due to, or aggravated by, service-connected disease or injury.

This post is general information about VA claims, not medical advice about your condition or legal advice about your claim. Every opinion I write rests on the veteran's own records.