How to Find a Qualified Nexus-Letter Provider

What VA considers a credible nexus opinion

VA evaluates medical opinion evidence under Nieves-Rodriguez v. Peake (CAVC 2008). The Court held that the most probative opinions come from clinicians who: (1) reviewed all the relevant evidence (not a single page sent by the veteran), (2) considered the veteran's lay statements about onset and continuity, (3) provided a reasoned medical rationale, and (4) addressed contrary evidence in the record. A letter that simply states 'I believe this condition is related to service' without explanation will be given little weight.

The clinician's credentials and specialty matter for some conditions. A board-certified pulmonologist's opinion on a respiratory burn-pit claim is generally more persuasive than a primary-care opinion. For mental-health claims, a psychiatrist or psychologist's opinion carries more weight than a physician assistant's, all else equal — but VA cannot reject a competent medical opinion solely because the writer is not a specialist (Cox v. Nicholson, 2007).

What the letter must contain

• Identification of the veteran and the clinician's credentials.
• A statement that the clinician reviewed the STR, post-service medical records, and relevant lay statements — with a list or summary of what was reviewed.
• Clear identification of the current diagnosis (and the diagnostic criteria used, e.g., DSM-5 for mental-health, ACR criteria for rheumatology).
• An opinion stated in the regulatory language: 'at least as likely as not,' 'more likely than not,' 'less likely than not,' or 'cannot be resolved without resort to speculation.'
• A reasoned medical rationale — the clinical and scientific reasoning that supports the opinion, ideally referencing peer-reviewed literature or established mechanisms (e.g., the chronic-pain-to-depression pathway, NSAID gastric injury, sleep-apnea-to-cardiovascular sequelae).
• Address of contrary evidence in the record (a prior negative C&P examiner's opinion, conflicting STR entries, etc.).
• Clinician's signature, date, and credentials.

Specialty fit — when it matters

• Respiratory / PACT Act claims — pulmonology or occupational medicine.
• Mental health — psychiatry (MD/DO) or licensed clinical psychologist (PhD/PsyD).
• Orthopedic / spine — orthopedic surgery or physical medicine and rehabilitation (PM&R).
• Neurology (TBI residuals, migraines, neuropathy) — neurology or PM&R.
• Cardiology — cardiology.
• Sleep apnea — sleep medicine board certification (often pulmonology or neurology subspecialty).
• Cancer claims — medical oncology or relevant surgical oncology.
• Endocrine — endocrinology.

Questions to ask before paying for an IMO

1. Will you review my STR, post-service medical records, and lay statements before writing the opinion?
2. Do you state opinions using the 'at least as likely as not' standard?
3. What is your specialty and board certification?
4. Will you address the prior C&P examiner's findings if my claim was previously denied?
5. How long is the typical letter, and may I see a redacted sample?
6. What is the total fee, and is it contingent on the conclusion? (Avoid providers whose fee is contingent on a favorable opinion — that compromises credibility.)
7. What is the turnaround time after I submit my records?
8. Will you be available to clarify or supplement the opinion if VA orders a follow-up exam?

Red flags

• Fees tied to the outcome of the opinion (favorable-only billing).
• Letters generated from a template with the same conclusion regardless of facts.
• Clinician outside the relevant specialty for a complex condition.
• Refusal to review the full STR ('Just send me your separation physical').
• No medical rationale — only a conclusion.
• High-volume mills with no time spent reviewing records.
• Promises of a specific VA result — no medical provider can promise how VA will decide a claim.

Oakridge Claims' role

On the cases we accept, we help the veteran identify what medical opinion is needed, what records should be sent to the clinician, and what specific questions the opinion should address. We do not write nexus letters, sign clinician opinions, or pay clinicians for opinions on a veteran's behalf — those are medical services that must come from a qualified, independent clinician of the veteran's choosing.

We can review a draft IMO for whether it addresses the regulatory standard and the elements VA needs to decide — and flag gaps the clinician may want to address before finalizing — but the medical conclusions themselves belong to the clinician.

Frequently Asked Questions