VA Nexus Letter: What It Is, With Examples

A nexus letter answers one question in a VA claim: is the condition you have now connected to your service? It is useful when that medical link is the open question in your file. It is wasted money when the open question is something else, like a missing diagnosis, a missing service record or how severe the condition is today. Work out which question is still open before you ask anyone to write.

What is a nexus letter?

A nexus letter is a written medical opinion from a qualified clinician about whether your current condition is connected to your military service, or to a condition VA has already service connected. "Nexus" means link. You will also see it called a nexus statement, a nexus opinion, a medical opinion letter or an independent medical opinion. They all describe the same thing: a clinician's reasoned answer to a medical question about cause or aggravation.

VA's evidence page says that for a condition related to active duty service, you need medical or lay evidence of three things, and for the third one it says: "Usually we need medical records or medical opinions from health care providers to support this link." A nexus letter is one of those opinions.

What gives the letter weight is not its title, its letterhead or its price. It is the reasoning: which records the clinician read, which facts they weighed, and why their conclusion fits your history. VA weighs a private opinion alongside everything else in the file, including any opinion from a VA examiner.

The three elements of service connection

For a direct claim, VA's evidence page lists three things your evidence has to show. A nexus letter only answers the third.

VA requires certain documents for every disability claim: your DD214 or other separation documents, your service treatment records, and any medical evidence related to your illness or injury. You can submit them or give VA permission to gather them.

Under 38 CFR 3.303, service connection can be established by showing the condition began during service or through a statutory presumption, and a disease diagnosed after discharge can still be service connected when all the evidence shows it was incurred in service. A late diagnosis is not a bar. It is the situation where a nexus opinion matters most.

A nexus letter cannot supply elements one or two. If the diagnosis or the service record is missing, gather that first. An opinion built on an event the record does not show is easy to set aside.

Who is competent to say what

VA's rules separate two kinds of evidence. Under 38 CFR 3.159(a), competent lay evidence comes from a person who has knowledge of facts or circumstances and describes things a lay person can observe. Competent medical evidence comes from a person qualified through education, training or experience to offer medical diagnoses, statements or opinions.

So your spouse can describe the nights they hear you stop breathing, and a fellow soldier can describe the rollover he saw. Those statements belong in the file, and Claim Raven's buddy letter examples and personal statement builder help you write them. Why it happens, and whether it is linked to service, is a medical question for a clinician.

What VA gathers for you

In a disability claim, VA will provide a medical examination or obtain a medical opinion when it decides one is necessary to decide the claim (38 CFR 3.159(c)(4)). VA calls this a claim exam, also known as a C&P exam. A private letter matters most when VA's opinion is missing, answers the wrong question or rests on a wrong fact.

When your decision letter arrives, read it for favorable findings, such as a finding that you have a current diagnosis or that an in-service event happened. Under 38 CFR 3.104(c), a favorable finding binds later VA and Board adjudicators unless evidence shows a clear and unmistakable error in it. A letter that already concedes two elements tells you the nexus is the only thing left to prove. Raven Eye reads a decision letter in plain English and points out favorable findings and denial reasons.

Do you need a nexus letter?

You may need one when the medical link is the unresolved question. Common examples: a condition first diagnosed years after service, a secondary claim where the connection is not obvious, or a VA examiner's negative opinion that rests on a wrong fact or skips a question.

When you do not need one: presumptive conditions

For some conditions and some kinds of service, the law supplies the link. VA's evidence page says: "If you have qualifying military service for a presumptive condition, you don't need to prove that your service caused the condition." For a presumptive claim, VA asks for medical records that show the diagnosis and severity, and military records that show you meet the service requirements.

VA says presumptions usually apply to:

• a chronic illness that appears within a year after discharge (under 38 CFR 3.307, the chronic diseases listed in 38 CFR 3.309(a) must show up to a degree of 10 percent or more within one year of separation, with longer windows for a few diseases)
• an illness caused by contact with toxic chemicals or other hazardous materials, including burn pits during Gulf War service, Agent Orange during Vietnam Era service, contaminated water at Camp Lejeune, ionizing radiation, and mustard gas or lewisite
• an illness caused by time spent as a prisoner of war
• certain illnesses linked to Gulf War service in Southwest Asia or Afghanistan, and certain tropical diseases

The word "presumptive" in a search result is not the same as meeting the rule. Check that your diagnosis is on the list and that your service dates and locations qualify. If the real gap is a service record, a nexus letter will not close it.

If your condition is not on a presumptive list, you can still prove it the direct way. Section 3.303(d) says the presumptive periods are not intended to limit service connection when the evidence warrants direct service connection. That is exactly the case for a nexus opinion.

Claims that turn on something other than the link

• Increased rating. VA says you need current evidence from a medical professional that shows your service-connected disability has gotten worse. The link is already established.
• Individual Unemployability (TDIU). VA asks for medical evidence that a service-connected disability prevents you from getting or keeping substantially gainful employment. That is a question about function and work, not about cause.
• Effective date or review lane problems. A medical opinion does not fix a filing date or a lane chosen wrongly.

A five-question check

Answer these from your actual file:

1. What is the current diagnosis? Write down the record and its date.
2. What event, exposure, injury or service-connected condition is involved? Name the source document.
3. Does the file already contain a medical opinion about the link? Note whether it is favorable, unfavorable, unclear or based on a wrong fact.
4. Does a presumption apply? Check the current rule, not a summary.
5. What medical question is still open? Write it as one sentence a clinician could answer.

If question five is blank, another letter is probably not your next step. The file may need a diagnosis, a service record, a treatment record or a correction instead.

What a nexus letter cannot fix

A well-supported opinion can explain causation, aggravation, timing and the weight of competing facts. It cannot create a diagnosis the clinician's own evaluation does not support, erase a later injury or a contrary test result, or guarantee service connection or a particular rating. Paying for a letter does not make it favorable or persuasive.

Direct, secondary and aggravation: the question changes

The right letter depends on the theory of your claim. Each theory asks the clinician a different question.

The secondary aggravation rule changed in 2026

In Spicer v. McDonough, 61 F.4th 1360 (Fed. Cir. 2023), the Federal Circuit held that 38 U.S.C. 1110 requires compensation when a service-connected disease or injury is a but-for cause of a present-day disability, including a condition that "would have been less severe were it not for the service-connected disability." VA's claims manual, M21-1 V.ii.2.D (changed May 1, 2026), now applies that standard. It covers any increase in severity that would not have occurred but for the service-connected disability, or a condition that would have been less severe but for it, "including where the SC disability has interfered with or impeded treatment" for the other condition.

Two practical results:

• VA no longer considers natural progress in these claims. The text of 38 CFR 3.310(b) still mentions it, but the manual says VA "will no longer consider natural progress" when it decides aggravation of a non-service-connected condition by a service-connected one.
• The baseline is still required. VA needs medical evidence of how severe the condition was before the worsening, or the earliest medical evidence after it began. The manual says that if no baseline can be established, VA denies the aggravation claim, though only after its duty to assist is fulfilled.

The worsening-during-service rule for a condition you had before you joined is different. It still turns on natural progress under 38 CFR 3.306.

For a secondary claim, ask the clinician to answer causation and aggravation separately. In El-Amin v. Shinseki, 26 Vet. App. 136 (2013), the Court of Appeals for Veterans Claims held that an examiner's statement that a condition was related to factors other than the veteran's service-connected PTSD was not enough to conclude that the PTSD did not aggravate it. An opinion that skips aggravation leaves a question open, and the Court held that the Board erred in relying on that inadequate opinion. The secondary conditions finder shows which pairings are commonly claimed.

Nexus letter examples

The three excerpts below are fictional. The names, dates and records are invented to show what a finished opinion looks like and what a reader should be able to check in it. Each one sits next to a passage from a real Board of Veterans' Appeals decision on the same kind of theory.

Use them to recognize a complete letter, not to write one for your doctor to sign. The opinion has to be the clinician's own medical judgment, and the clinician may reach a conclusion that does not support your claim. The bracketed lines mark where only the clinician can supply the medical explanation.

Example 1: nexus letter for back pain (direct service connection)

The file (fictional): Avery has lumbar degenerative disc disease on a 2024 MRI. A May 2009 service treatment note records low back pain after a vehicle rollover. Treatment is sparse from 2011 to 2017. A 2018 urgent care note records a lifting strain at a civilian job. A 2023 VA examiner gave a negative opinion and wrote that the service treatment records show no back complaints.

Fictional example. I am a board-certified physical medicine and rehabilitation physician, and I have treated Avery since March 2022. I reviewed these records: the service treatment note dated May 12, 2009 (page 4), which records low back pain after a vehicle rollover during a convoy; the separation history dated June 2, 2010 (page 7), which lists recurrent back pain; VA primary care notes from 2011 to 2017 (pages 9 to 15); an urgent care note dated August 3, 2018 (page 16), which records a lifting strain at work; a lumbar MRI dated February 20, 2024 (page 19); and the VA examination report dated July 11, 2023 (page 22).

The 2023 VA opinion states that the service treatment records contain no back complaints. That premise is not accurate. The May 2009 note documents a back injury and treatment, and the 2010 separation history repeats the complaint.

I considered the 2018 lifting strain. The urgent care note records it as a flare of back pain present since service, and the follow-up note four weeks later records a return to the earlier level of symptoms.

In my medical opinion, it is at least as likely as not (the likelihood is at least approximately balanced or nearly equal, if not higher) that Avery's current lumbar degenerative disc disease began in, or is related to, the documented 2009 in-service injury.

[The clinician's medical explanation of why the documented injury and the treatment history support this conclusion better than the 2018 strain, with any literature relied on and how it fits Avery's history.]

What a reader can check: every record is named by date and page, the later injury is addressed instead of left out, the wrong premise in the earlier opinion is named, and the conclusion uses VA's standard.

In the Board's words: In a March 26, 2025 decision (Citation A25028065), the Board granted service connection for a back disability on a private physician assistant's opinion tied to a documented in-service motor vehicle accident. It found that the examiner "provided adequate rationale and relied on an accurate history." It gave no probative value to two negative VA opinions, one of which relied "on an inaccurate factual premise (that the Veteran's STRs are unremarkable for back diagnoses or treatment)."

Example 2: nexus letter for a secondary condition (causation)

The file (fictional): Jordan is service connected for an anxiety disorder with chronic sleep impairment, rated since 2019. GERD was diagnosed in 2023 after about a year of heartburn. The records also show a 30-pound weight gain in 2021 and daily ibuprofen for a knee. A VA examiner's negative opinion said research shows only an association between anxiety and reflux.

Fictional example. I am a family nurse practitioner and have been Jordan's primary care provider since 2020. I reviewed the 2019 VA rating decision granting service connection for an anxiety disorder with chronic sleep impairment; VA mental health notes from 2019 to 2024; the gastroenterology note and endoscopy report dated April 4, 2023, which diagnose GERD; primary care notes recording a 30-pound weight gain in 2021 and daily ibuprofen use for a knee condition; and the VA opinion dated January 9, 2024.

Sequence: the anxiety disorder and sleep impairment are documented from 2019. Heartburn first appears in the notes in April 2022, and GERD is diagnosed in April 2023.

Other causes I weighed: [how the clinician weighed the 2021 weight gain and the daily ibuprofen, and why they do or do not change the answer].

Causation: In my opinion, it is at least as likely as not that Jordan's GERD was caused by the service-connected anxiety disorder. [The clinician's explanation of the medical mechanism, and how any cited study applies to Jordan's timeline rather than to a population.]

Aggravation, answered separately so it stands on its own if VA does not accept the causation answer: it is at least as likely as not that Jordan's GERD is aggravated by the veteran's service-connected anxiety disorder, meaning it would be less severe but for the anxiety disorder. [The clinician's reasoning for the aggravation answer.]

A list of studies is not the reasoning. The letter has to apply the mechanism to this person's timeline and say why the competing explanations do or do not change the answer.

In the Board's words: In a January 28, 2025 decision (Citation A25007304), the Board granted service connection for GERD as secondary to a service-connected anxiety disorder. A private nurse practitioner "provided a detailed rationale," explaining a multi-step causal chain and citing studies. The VA examiner's opinion got little weight, in part because "Nor did the VA examiner address the question of whether the Veteran's anxiety disorder aggravated his GERD."

Example 3: secondary aggravation and the baseline record

The file (fictional): Casey has migraines that are not service connected. A 2018 neurology note records about two migraine days a month on one preventive medication. Casey is service connected for a cervical strain that flared in 2022. By 2024, neurology notes and a headache log record eight to ten migraine days a month on two preventive medications. Casey also started night shifts in 2023 and uses more over-the-counter pain relievers.

Fictional example. Baseline: the neurology note dated March 6, 2018 (page 3) records about two migraine days a month on one preventive medication. It is the last record of migraine severity before the neck condition flared in 2022.

Current severity: neurology notes from January to June 2024 (pages 11 to 14) and Casey's headache log record eight to ten migraine days a month on two preventive medications.

Other explanations: I considered the night-shift schedule that began in 2023 and the increased use of over-the-counter pain relievers. [How the clinician weighed each one.]

Opinion: In my opinion, it is at least as likely as not that Casey's migraine condition is aggravated by the veteran's service-connected cervical strain, meaning it would be less severe but for the cervical strain. [The clinician's reasoning, including whether the neck condition interfered with migraine treatment.]

The letter does not need to estimate natural progress for a secondary aggravation claim any more. It does need the dated baseline, because VA rates the aggravation by comparing the current level with the baseline.

In the Board's words: In a November 14, 2023 decision (Citation A23031938), the Board remanded a claim for sleep apnea as secondary to a service-connected adjustment disorder. The VA opinion addressed causation, but "no opinion was provided regarding the aggravation theory of entitlement for secondary service connection. Without a medical opinion on aggravation, the Board is unable to make an informed decision on the Veteran's claim." A remand is not a grant. It sent the question back for a complete opinion.

Raven Nexus also publishes complete fictional drafts with their source excerpts and research notes, which you can open as Word or PDF files.

Nexus letter format and template

VA does not publish a form for a private nexus opinion. Its Medical Opinion DBQ is on VA's list of DBQs "not available for public use," so a private opinion is written as a letter or report. What matters is that a reader can check every part of it.

What a finished nexus letter contains

1. The clinician's name, credentials, specialty and license, and their relationship to you (treating provider or independent reviewer).
2. The question answered, naming the current diagnosis and the proposed link: an in-service event, or a service-connected condition.
3. The records reviewed, each one by date, ideally with page numbers.
4. The relevant history, including the facts that cut against the connection.
5. The opinion, stated with VA's probability standard ("at least as likely as not" or "less likely than not").
6. The reasoning that connects the facts to the conclusion, including how any cited research applies to you.
7. A separate aggravation answer for a secondary claim, with the baseline record.
8. Limits: missing records or questions the clinician could not answer.
9. Signature and date on the final copy.

A request template to give your doctor

Copy this, attach a dated record index, and give both to the clinician. You fill in items 1 to 5. Items 6 to 10 belong to the clinician, so leave them blank.

Request for a medical opinion for a VA disability claim

Patient name: [ ] Date of request: [ ]

1. Question to answer (check each one you are asking about)

[ ] Direct: Is [current condition] at least as likely as not related to [in-service event, injury, disease or exposure, with date]?

[ ] Secondary causation: Is [condition] at least as likely as not caused by the veteran's service-connected [condition]?

[ ] Secondary aggravation: Is [condition] at least as likely as not aggravated by the veteran's service-connected [condition], meaning it would be less severe but for the [condition]?

2. Records provided (date, record, page): [ ]

3. Facts that may cut against the connection: [ ]

4. Earlier opinions in the file and what they concluded: [ ]

5. Baseline record (aggravation only): a medical record showing severity before the worsening, or the earliest one after it began: [ ]

For the clinician

6. Records you reviewed: [ ]

7. Your opinion on each checked question, in your own words: [ ]

8. Your reasoning, including how you weighed item 3 and any research you relied on: [ ]

9. Limits, such as missing records or questions you could not answer: [ ]

10. Name, credentials, specialty, relationship to the patient, signature and date: [ ]

What "at least as likely as not" means

VA's own forms define the phrase. The diabetes Disability Benefits Questionnaire, updated March 16, 2026, asks whether a condition is "at least as likely as not (likelihood is at least approximately balanced or nearly equal, if not higher)" the result of diabetes. The phrase does not require medical certainty. It is a lower bar than "more likely than not," which VA's claims manual (M21-1 V.ii.1.A) describes as the preponderance standard.

The phrase matters because of the benefit-of-the-doubt rule. Under 38 U.S.C. 5107(b), "When there is an approximate balance of positive and negative evidence regarding any issue material to the determination of a matter, the Secretary shall give the benefit of the doubt to the claimant." 38 CFR 3.102 adds that reasonable doubt is "within the range of probability as distinguished from pure speculation or remote possibility." See the benefit of the doubt glossary entry for more.

That is why wording like "could be related," "may have contributed" or "possibly" weakens a letter. Those words describe a possibility, not a probability, and they invite the reader to treat the opinion as speculation. VA's own policy for its doctors, VHA Directive 1134, tells VA providers who give causation opinions to "employ standard language appropriate for medical opinions (such as 'at least as likely as not', etc.)".

The phrase alone is not enough, though. A letter that says "at least as likely as not" and then explains nothing is still a bare conclusion.

What makes a nexus letter strong

The Court of Appeals for Veterans Claims set the test in Nieves-Rodriguez v. Peake, 22 Vet. App. 295, 304 (2008): "It is the factually accurate, fully articulated, sound reasoning for the conclusion, not the mere fact that the claims file was reviewed, that contributes probative value to a medical opinion." The Court added that "most of the probative value of a medical opinion comes from its reasoning," and that neither a VA examination report nor a private opinion "is entitled to any weight" if it contains only data and conclusions.

An earlier case, Stefl v. Nicholson, 21 Vet. App. 120, 124 (2007), held that a medical opinion "must support its conclusion with an analysis that the Board can consider and weigh against contrary opinions," and that an opinion is adequate where it is based on the veteran's prior medical history and examinations. A strong letter therefore does three things: it gets the facts right, it explains the medicine, and it deals with the evidence that points the other way.

Board rulings show the same pattern. The table groups service connection rulings by what the Board did with the medical opinions in the file.

Board of Veterans' Appeals rulings, 2021 to 2026, from Claim Raven's reading of 511,036 decisions. Appealed claims, not first-time claims, and not your personal odds. Associations, not causes. Medical opinions are read only on rulings the Board granted or denied, so compare each row with the last one, not with the grant rate that counts remands. How these figures are built.

Rulings where the Board credited a favorable opinion, or set a VA opinion aside, were granted far more often than rulings overall. Rulings where the Board relied on an opinion against the claim were almost never granted. These are appealed claims and associations, not your odds, and the Board's view of an opinion is partly its own conclusion. The practical lesson is narrow: a letter helps when the Board can rely on its reasoning.

Red flags to check before you submit a letter

Ask for clarification, not a rewrite. Give the clinician the record corrections and the open questions, and keep the original so any change is visible. If the clinician's view changes after seeing a record, that is their call.

Include the records that hurt

The Board weighs whether an opinion was built on the whole record. In a February 26, 2025 decision (Citation A25017424), the Board denied service connection for a low back condition. A private doctor's opinion did not mention a February 1996 VA examination, with X-rays, that found no back diagnosis after service. The Board wrote that "the opinion does not address the negative diagnostic findings from the post-service examination," found it inadequate and gave it "minimal probative weight."

An opinion that engages with the bad facts can still be favorable. An opinion that skips them gives the Board an easy reason to set it aside. Never remove an unfavorable record from the packet. Flag it and ask the clinician whether it changes the analysis.

Who can write a nexus letter

Under 38 CFR 3.159(a)(1), competent medical evidence comes from "a person who is qualified through education, training, or experience to offer medical diagnoses, statements, or opinions." The test is qualification for the question, not a particular title. In the two grants quoted above, the Board relied on a physician assistant's opinion for a back claim and a nurse practitioner's opinion for a GERD claim.

Fit matters. A clinician whose training matches the condition, and who explains why, gives the reader less reason to doubt the opinion. Credentials still do not repair missing reasoning. Two case breakdowns show the range: two chiropractor nexus letters the Board gave no probative weight, and a physician assistant's opinion that won a neck claim.

Can a VA doctor write a nexus letter?

Yes, but VA policy treats a causation opinion as something a VA clinician may choose to give. VHA Directive 1134, amended July 8, 2025, says VA providers, when requested, "must assist patients in completion of VA and non-VA medical forms and provide medical statements" about your condition and how it affects your function. For cause, it says providers "who wish to provide medical opinions that state causality must include clear and specific rationale citing evidence." It also notes that VA providers often do not have your military medical records, and that service connection is decided by the Veterans Benefits Administration.

The same directive says:

• every VA medical facility must have a process for reconsideration when a provider refuses to issue a medical statement or complete a form, and a Medical Statements and Forms point of contact you can ask
• the facility must have a process to tell you when a statement or form cannot be completed within 20 work days
• for mental health DBQs, VA recommends that your treating provider not complete the form, to protect the treatment relationship

Can you write your own nexus letter?

Not as medical evidence, unless you are yourself qualified to give that medical opinion. What you can write is a statement about what you experienced and when, which VA treats as lay evidence. A lawyer, claims agent or VSO representative can organize the records and argue the case, but the medical opinion has to come from a qualified clinician.

How to ask your doctor for a nexus letter

Ask whether your doctor is willing to review the relevant records and give their own medical opinion. Do not ask them to sign a conclusion you wrote, and do not make the request depend on the answer being favorable. A short request with an indexed packet is easier to say yes to than a stack of records and a request to "help with my VA claim."

Start with one neutral medical question

The question names your current condition and the proposed connection. It does not dictate the answer. For example:

• "In your medical judgment, is my current right shoulder condition related to the documented injury in June 2011?"
• "Did my service-connected ankle condition cause my current hip condition? Separately, is the hip condition aggravated by the ankle condition, meaning it would be less severe but for it?"
• "Is my diagnosed sleep disorder at least as likely as not aggravated by my service-connected asthma, meaning it would be less severe but for the asthma?"

A short script

I am preparing a VA disability claim and need a medical opinion about whether my current condition is connected to the history in these records. Would you be willing to review a short, indexed packet and decide whether you can give an independent opinion? I understand you may disagree with the proposed connection or need more information. If you can give an opinion, VA needs the medical reasoning and the records you relied on, not only a conclusion.

Bring a one-page request with the question, a timeline of service, symptom, diagnosis and treatment dates, the specific records with page numbers, the facts that cut against the connection, and a blank page for the clinician's own questions. "March 2024 sleep clinic note, page 18" is more useful than "somewhere in my records."

If your doctor says no

A refusal can mean several things: the practice does not write opinions for benefits claims, the clinician does not have time, the question is outside their expertise, the records are incomplete, or the clinician does not support the connection. Ask which reason applies.

Incomplete records are the reason you can fix. Ask: "Which records would you need to see before you could evaluate this, and would you review the question again if I bring them?" If the reason is office policy or scope, look for another qualified clinician. If the clinician does not support the connection, do not press them to change a medical conclusion. At a VA facility, ask for the Medical Statements and Forms point of contact and the reconsideration process described above.

What medical records your doctor needs

A clinician needs the records that answer the medical question, not every page you have. Put them in a short, dated index so the clinician can check each one. The index describes what each record may show. It does not tell the clinician what to conclude, and it lists the bad facts as plainly as the good ones.

Fictional example: index for a left knee claim (direct theory)

The core packet usually has six parts:

1. Service and personnel records. Your DD214, the service treatment records that mention the injury, symptom or exposure, and records showing where you served and what you did. For a secondary theory, add the rating decision for the service-connected condition.
2. Current diagnosis and testing. The note, imaging, lab result or sleep study that documents the condition now.
3. Symptom and treatment timeline. Records that show onset, persistence, gaps, changes in severity and major treatment, plus statements from people who saw the symptoms.
4. Earlier opinions and exams. Favorable and unfavorable C&P opinions, DBQs, private opinions and the relevant parts of any decision letter. A new clinician cannot answer a disputed premise they have not seen.
5. Facts that cut against the connection. Later injuries, occupational exposures, medication or weight changes, family history. Leaving them out makes the opinion easy to discount.
6. Research, if it fits. The full citation, one sentence on why it may apply and one on its limits. An association in a population does not establish cause in one person.

For an aggravation theory, add the baseline: a medical record showing how severe the second condition was before it worsened, or the earliest medical record after the worsening began. Leave out duplicate exports, blank pages and unrelated sensitive records. If you still need copies of your files, the VA medical records guide covers how to request them.

Raven Nexus can build this packet from records you upload or choose from your Claim Workspace. It shows the source passages it used, with dates and page references where available, and adds a request letter and a review checklist for your clinician. It does not include a clinician, an appointment or a signature.

Nexus letter vs. DBQ

A Disability Benefits Questionnaire (DBQ) records medical findings: diagnosis, symptoms, test results and how the condition limits you. A nexus opinion explains whether and how a condition is connected to service or to a service-connected condition. One clinician can address both, and some DBQs include opinion questions, but they answer different questions in a claim.

Fictional example: Taylor submits a knee DBQ that documents the diagnosis, range of motion, flare-ups and limits. It does not mention the jump injury in Taylor's service records, and it does not say whether the knee condition is related to it. The DBQ helps with diagnosis and severity. The connection question is still open.

VA's public DBQ page says you can have your health care provider fill out and submit the forms for your claimed conditions, and that VA does "not pay or reimburse any expenses or costs incurred while completing and/or submitting DBQs." At a VA claim exam, the examiner may ask questions from the DBQ for each condition you claim.

Do not buy both documents by default. List each open question, find the record that already answers it, and ask the clinician which exam, form or record review fits. A prior C&P report may already contain a diagnosis and an opinion.

How much does a nexus letter cost?

Private nexus letters are a paid service, and prices, required screening fees, add-ons and refund terms differ by company. Claim Raven's nexus letter cost comparison lists letter fees, required reviews, add-ons and refund limits from 20 providers, rechecked in September 2026, and its nexus letter provider reviews cover individual companies, including Telemedica. Check the current price with the provider before you pay.

Before you pay anyone, check the routes that cost less:

• VA's own exam. VA provides an examination or opinion when it decides one is necessary to decide your claim. Read that opinion first.
• Your VA treating provider. VHA Directive 1134 requires VA providers to help with forms and medical statements when asked. A causation opinion is up to them.
• Your private doctor. Ask what the office charges for a records review and written opinion. VA does not pay or reimburse costs for a private DBQ.
• A VSO. VA says the services an accredited VSO representative provides on your claim "are always free." A VSO cannot write the medical opinion, but can help you decide whether you need one. Find a VSO near you.

A higher price does not buy a better opinion. The Board weighs the reasoning, the facts and the fit of the clinician, not the invoice.

What if VA already has a negative opinion?

Read the examiner's explanation before you decide what to do. The problem is usually one of four kinds:

• A factual error. The opinion says there was no in-service injury, but a dated service record shows one.
• An overlooked record. The examiner did not mention a record that bears on the question.
• An unanswered question. The opinion addresses causation but says nothing about aggravation, or addresses the wrong condition.
• A medical disagreement. The examiner considered the right facts and reached a different conclusion.

The first three can sometimes be argued from the existing record. The fourth usually needs another qualified opinion. The review lane matters. VA says "You can't submit new evidence with a Higher-Level Review," so a new private opinion belongs in a Supplemental Claim or in a Board appeal on a docket that takes evidence (38 CFR 20.302 and 20.303).

For a Supplemental Claim, the opinion has to be new and relevant. Under 38 CFR 3.2501, new evidence is evidence not previously part of the actual record, relevant evidence tends to prove or disprove a matter at issue, and relevant evidence "includes evidence that raises a theory of entitlement that was not previously addressed." An aggravation opinion after a causation-only denial can do exactly that. The VA claim denied guide walks through choosing a lane.

Questions about nexus letters

Is a nexus statement the same as a nexus letter?

Yes. Nexus statement, nexus opinion, medical opinion letter and independent medical opinion all describe a clinician's written opinion about whether a condition is linked to service or to a service-connected condition. The label does not matter. The reasoning does.

Can I write my own nexus letter?

Not as medical evidence, unless you are qualified through education, training or experience to give that medical opinion. You can write a statement about what you experienced and when, which VA treats as lay evidence alongside the medical records.

Can a VA doctor write a nexus letter?

Yes. VHA Directive 1134 lets VA providers who wish to give causation opinions do so, with clear and specific rationale citing evidence. Each VA medical facility must have a reconsideration process when a provider declines and a Medical Statements and Forms point of contact.

How long does a VA doctor take to complete a medical statement?

VHA Directive 1134 refers to a 20 work day timeframe and requires each VA facility to have a process to tell you when a medical statement or form cannot be completed within it. The directive does not require a provider to write a causation opinion.

Do you need a nexus letter for presumptive conditions?

Usually not. VA says that if you have qualifying service for a presumptive condition, you don't need to prove that your service caused it. You still need medical records showing the diagnosis and severity, and military records showing you meet the service requirements.

Can a lawyer or VSO write a nexus letter?

Not as medical evidence. A lawyer, claims agent or VSO representative can gather records and argue your claim, but the medical opinion has to come from someone qualified to give medical opinions. A representative can help you decide whether you need one and what question to ask.

Is a nexus letter new evidence for a Supplemental Claim?

It can be. A medical opinion that was not part of the record before VA is new, and it is relevant if it tends to prove or disprove a matter at issue, including a theory of entitlement VA did not address before, like aggravation.

Does a nexus letter have to say "at least as likely as not"?

It should state the clinician's view in VA's standard language, and VA's own policy tells its providers to use it. But the phrase is not enough by itself. Without reasoning based on the actual records, it is a bare conclusion.

What is the success rate of a nexus letter?

There is no success rate that applies to your claim. The table above compares Board rulings by what the Board did with the medical opinions in the file. It shows patterns in appealed claims, not your odds, and a purchased letter does not land in the favorable group because it was purchased.

Does a nexus letter guarantee approval?

No. VA weighs the opinion with every other piece of evidence, including any VA examiner's opinion. A favorable letter that rests on a wrong fact or skips a contrary record can be given little weight.

Sources

Checked October 6, 2026.

• VA, Evidence needed for your disability claim (last updated June 8, 2026): the three things a direct claim must show, the documents VA requires, presumptive, increased, secondary and TDIU evidence
• VA, Higher-Level Reviews (last updated July 2, 2026): no new evidence
• VA, Public Disability Benefits Questionnaires: your provider can complete DBQs; VA does not pay or reimburse costs
• VA, VA claim exam (C&P exam): DBQ questions at the exam
• VA, Accredited representative FAQs: VSO services are always free
• VA, Diabetes Mellitus DBQ (updated March 16, 2026): the definition of at least as likely as not
• VHA Directive 1134, Provision of Medical Statements and Completion of Forms by VA Health Care Providers (amended July 8, 2025)
• M21-1, Part V, Subpart ii, 2.D (changed May 1, 2026), secondary service connection and aggravation; M21-1, Part V, Subpart ii, 1.A, standards of proof
• 38 U.S.C. 5107(b); 38 CFR 3.102, 3.104, 3.159, 3.303, 3.306, 3.307, 3.309, 3.310 and 3.2501; 38 CFR 20.302 and 20.303 (eCFR, October 1, 2026)
• Spicer v. McDonough, 61 F.4th 1360 (Fed. Cir. 2023); Nieves-Rodriguez v. Peake, 22 Vet. App. 295 (2008); Stefl v. Nicholson, 21 Vet. App. 120 (2007); El-Amin v. Shinseki, 26 Vet. App. 136 (2013)
• Board of Veterans' Appeals decisions A25028065 (March 26, 2025, granted), A25007304 (January 28, 2025, granted), A23031938 (November 14, 2023, remanded) and A25017424 (February 26, 2025, denied). Each applies only to its own record.

The examples, the record index and the DBQ scenario are fictional. Claim Raven sells Raven Nexus, so it has a commercial interest in your choice. Claim Raven is not a law firm, a VSO, an accredited representative or a medical provider, and this guide is not legal or medical advice. For help with your claim, talk to an accredited representative.