What veterans and families most often ask about nexus letters, independent medical opinions, and DIC claims.
What is a nexus letter?
A nexus letter is an independent medical opinion, written by a physician, that connects your current medical condition to your military service — or to an existing service-connected condition — using the VA's "at least as likely as not" evidentiary standard.
Who can write a nexus letter?
Any licensed physician may write one, but credibility drives the weight it carries with VA reviewers. Opinions hold more probative value when authored by a board-certified physician who reviews your complete record. Every Hart Causation opinion is personally authored by Dr. John H. Hart, Jr., M.D. — ABIM board-certified, 25+ years of clinical experience, and a career in military aerospace medicine.
How much does a nexus letter cost?
Fees range from $1,500 to $3,500 depending on the complexity of your case. Expedited 72-hour rush service is a flat $500 in addition to the case fee. You receive a scope confirmation before any commitment.
How long does a nexus letter take?
Standard turnaround is 10–14 business days from acceptance. A 72-hour rush option is available for deadline-driven claims and appeals.
Do you write nexus letters for secondary conditions?
Yes. Opinions can address secondary service connection — conditions caused or aggravated by an existing service-connected disability — where the medical evidence supports the connection.
Do you complete DBQs or perform C&P exams?
No. Hart Causation and Claims provides independent medical opinions only — no DBQs, no in-person exams, no diagnosis or treatment. All communication runs through secure, HIPAA-compliant channels.
What is a DIC letter?
A Dependency & Indemnity Compensation (DIC) letter is a physician's opinion for surviving spouses and families, addressing whether a veteran's death was linked to a service-connected condition.
Why does a physician-authored letter cost more than an online template service?
Low-cost services often produce short, templated letters that VA reviewers have learned to discount. Every Hart Causation opinion includes a complete review of your records, engages conflicting evidence instead of ignoring it, and is personally authored and signed by a board-certified M.D. whose credentials appear in the letter. The fee buys probative value — the weight the opinion carries when the VA weighs it.
