Nexus Letter for PTSD
PTSD claims usually turn on the stressor, not on the nexus — and the rules for proving a stressor differ by claim type.
PTSD is the most-appealed mental-health condition at the Board, and the failure point is usually the in-service stressor rather than the medical link. VA's stressor rules under 38 CFR § 3.304(f) are more forgiving than most veterans expect: combat veterans and veterans claiming fear of hostile military activity can establish a stressor on their own consistent statement, and military sexual trauma claims may be corroborated by indirect markers rather than a report. A nexus letter matters here, but it is doing a supporting job behind the stressor evidence.
Check this first: is PTSD presumptive for you?
If a presumption applies to your service, VA connects the condition without requiring you to prove the medical link — which can mean you do not need a nexus letter at all. Presumptions turn on where and when you served, so read the qualifying service line before assuming one fits.
- Former Prisoners of War
Applies to: Held as a POW for any length of time (conditions vary by duration — some require 30+ days).
38 CFR § 3.309(c)
VA's published list →
Limits that change the answer
- !Former Prisoners of War: Osteoporosis presumption requires a service-connected PTSD diagnosis. If the POW does not have PTSD on record, the osteoporosis presumption does not apply — flag as "possibly_presumptive" and recommend getting the PTSD claim filed first.
- !Former Prisoners of War: Duration-based conditions (30+ days POW) require evidence of captivity length in the POW status record.
Presumptive lists last reviewed 2026-04-19. Rendered from our tracked copy of VA's published lists, not retyped per page.
What every nexus letter must do
These four apply to every condition. A letter missing any one of them is the most common reason an otherwise good claim is denied.
- 1.A statement that your records were reviewed
VA weighs a medical opinion partly on whether the clinician actually had the evidence in front of them. A letter that does not say what was reviewed reads as an opinion formed without the file.
- 2.A current diagnosis
Service connection requires a present disability. The letter should state the diagnosis plainly rather than describing symptoms and leaving the conclusion implied.
- 3.The phrase "at least as likely as not"
This is VA's evidentiary standard — a 50 percent or greater probability. Under 38 CFR § 3.102 the tie goes to the veteran, and this phrase is what places the opinion at or above that line. Softer wording ("possibly," "may be," "could be," "cannot rule out") sits below the standard and is a leading cause of denial.
- 4.A stated medical rationale
The reasoning behind the conclusion, not just the conclusion. An opinion that gives an answer without explaining the basis for it carries little weight, no matter how well-credentialed the signer.
What PTSD letters must establish on top of that
- ›A current PTSD diagnosis meeting DSM-5 criteria, from a provider VA recognizes for that purpose.
- ›The link between the diagnosis and the specific claimed in-service stressor — named, not described generically.
- ›That the examiner considered and addressed any other mental-health diagnoses in the record, rather than leaving a conflict for the rater to resolve.
What gets PTSD letters discounted
- !A diagnosis of something other than PTSD — for example an unspecified depressive disorder — is not the end of the claim. The Board routinely grants service connection for whatever mental-health condition the evidence actually supports.
- !For military sexual trauma claims, secondary markers matter: a sudden transfer request, a performance drop, a marriage breakdown, or new mental-health treatment near the event.
- !Combat veterans should make sure the letter and the claim both invoke the combat provision, because it changes what has to be proven.
Draft the PTSD letter — free
Our drafter builds the VA-compliant framing and language for your doctor to review, edit, and sign. It is free, there is no account and no card, and the medical judgment stays with your physician — we write the structure, not the opinion.
Draft my PTSD nexus letter →Opens the drafter with PTSD and the direct theory already filled in. You can change both.
Also useful for PTSD claims
- PTSD rating criteria — what each percentage requires, and what it pays.
- Real Board grants for PTSD — verbatim language from decisions that were actually granted.
- What nexus letters cost — what you are paying for, and when you do not need to pay at all.
- C&P exam prep — the questions the examiner will ask and how to answer them.
Nexus letters for other conditions
NexusVetClaims provides software, not legal representation or medical advice. We are not VA-accredited and never take a percentage of your benefits. A nexus letter is a medical opinion — only a qualified clinician who has evaluated you can provide one. Regulations cited here are current as published on eCFR; verify anything load-bearing against the source before you file.