Two documents dominate most service-connection decisions, and veterans regularly confuse them. The Compensation and Pension (C&P) examination is ordered by the VA and performed by a VA clinician or contractor. An independent nexus letter is evidence the veteran obtains and submits. Both speak to the same question - the medical link between a current condition and service - but they arrive from different directions and are weighed against each other when they disagree.
What the C&P exam is for
Under 38 CFR 3.159, the VA must assist you in developing your claim, which includes providing an examination when the record suggests a current disability and an in-service event but lacks enough medical evidence to decide. The examiner documents severity and often renders an opinion on connection. That opinion belongs to the VA's side of the ledger: a favorable one frequently decides the claim on its own, and an unfavorable one is the single most common reason otherwise strong claims are denied.
Examinations vary in quality. Some are thorough; others are brief, rely on an incomplete record, or state a conclusion with little rationale. Condition-specific guides such as the back C&P exam and the knee C&P exam explain what a complete examination should capture.
Where veterans start
Every case is different, and there is no obligation at any step. When veterans want to understand what their records actually support, these are the two most common starting points:
- Medical records review
A licensed physician reviews your records for a $250 flat fee and identifies which conditions the available evidence may support. The fee is refunded in full if nothing supportable is identified.
- Nexus letter
When the records support one, a licensed provider writes the medical opinion that addresses the link between your condition and your service or an already service-connected disability.
What an independent nexus letter adds
An independent opinion is built from the complete record, not a fifteen-minute appointment, and for physical conditions it can be prepared remotely regardless of where the doctor practices. A strong one identifies every document reviewed, addresses the in-service event by date and source, explains the medical mechanism, and states the conclusion in the 'at least as likely as not' language the standard of proof requires. When it conflicts with an unfavorable C&P opinion, the rater must weigh both - and a well-reasoned independent opinion is what makes that weighing a real contest rather than a formality.
When the two opinions conflict
The VA cannot simply prefer its own examiner. Raters are required to weigh all competent medical evidence, and an opinion supported by a complete record review and a reasoned explanation can outweigh a cursory examination. This is why reading the decision letter matters: if a denial rests on the C&P examiner's conclusion, the effective response is new, substantive medical evidence - submitted through a Supplemental Claim - not a general protest. A paid medical records review is the usual way to find out whether the record supports that response before paying for a nexus letter.