Hart Causation & Claims, LLC

VA Claims Insights

Weekly plain-language articles on nexus letters, secondary service connection, DIC claims, and the medical evidence behind VA decisions.

VA Claims Insights • DIC & Survivor Claims

How Do You Get a Deceased Veteran's Records for a DIC Claim? Where Each One Comes From

October 20, 2026 • 6 min read

A surviving spouse can request every record a DIC claim and a cause-of-death opinion rely on — but each one lives in a different place. Where to get the long-form death certificate, the VA claims file (Form 20-10206), terminal hospital records, and service records from the National Personnel Records Center.

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VA Claims Insights • DIC & Survivor Claims

Is It Too Late to File a VA DIC Claim? What Deadlines, Effective Dates, and Review Windows Actually Mean

October 13, 2026 • 6 min read

There is no deadline to file for DIC — filing years after a veteran's death changes where back pay starts, not whether you can file. The one-year effective-date rule, the review windows after a denial, and where a cause-of-death medical opinion fits as new and relevant evidence.

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VA Claims Insights • DIC & Survivor Claims

VA Denied Your DIC Claim for Insufficient Medical Evidence? What a Cause-of-Death Opinion Addresses

October 6, 2026 • 6 min read

A DIC denial for "insufficient medical evidence" is not a ruling that the connection is false — it often means no physician ever explained it in the file. What the denial language means, how a cause-of-death opinion works as new and relevant evidence, and which records to gather.

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VA Claims Insights • Secondary Service Connection

IBS Secondary to PTSD: What a VA Nexus Letter Must Show

September 28, 2026 • 6 min read

How a physician-authored VA nexus letter connects irritable bowel syndrome to service-connected PTSD: the confirmed diagnosis, the gut-brain axis rationale, and the evidence gaps that get these claims denied.

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VA Claims Insights • C&P Exams & Evidence

Unfavorable C&P Exam Opinion: How an Independent Medical Opinion Responds

September 7, 2026 • 6 min read

When a C&P examiner concludes "less likely than not," the claim is not over. What an independent physician medical opinion can address — rationale, records, and the evidence the examiner did not weigh.

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VA Claims Insights • Secondary Service Connection

Depression Secondary to Chronic Pain: What a VA Nexus Letter Must Show

August 31, 2026 • 6 min read

How a physician-authored nexus letter connects depression to a service-connected chronic pain condition: the confirmed diagnosis, the pain-to-mood pathway, and the medical rationale the VA expects.

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VA Claims Insights • Secondary Service Connection

Erectile Dysfunction Secondary to PTSD: What a VA Nexus Letter Must Show

August 24, 2026 • 6 min read

How a physician-authored VA nexus letter connects erectile dysfunction to service-connected PTSD or its medications — and the evidence gaps that get these claims denied.

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VA Claims Insights • DIC & Survivor Claims

DIC Claims: How a Nexus Letter Closes the Service-Connection Gap After Death

August 20, 2026 • 6 min read

When a veteran was never service-connected for the condition that led to death, the DIC claim stalls on a missing link. How a physician-authored opinion addresses it.

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VA Claims Insights • Secondary Service Connection

Radiculopathy Secondary to a Back Condition: What a VA Nexus Letter Must Show

August 17, 2026 • 6 min read

Nerve pain that radiates from a service-connected spine condition can be rated separately — only when the medical evidence connects it.

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VA Claims Insights • Secondary Service Connection

Nexus Letter for Peripheral Neuropathy Secondary to Diabetes: What the VA Needs to See

August 10, 2026 • 6 min read

How a VA nexus letter connects peripheral neuropathy to service-connected diabetes: the confirmed diagnosis, EMG/nerve conduction evidence, the medical rationale, and the "at least as likely as not" standard.

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VA Claims Insights • Secondary Service Connection

Migraines Secondary to Tinnitus: How a VA Nexus Letter Connects Them

July 27, 2026 • 6 min read

What a strong VA nexus letter for migraines secondary to tinnitus must address: the confirmed headache diagnosis, the service-connected tinnitus, the medical rationale, and the "at least as likely as not" standard.

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VA Claims Insights • Secondary Service Connection

Nexus Letter for Hypertension Secondary to PTSD: What the VA Looks For

July 20, 2026 • 6 min read

How a physician-authored nexus letter connects service-connected PTSD to hypertension, why conclusory opinions get denied, and what the "at least as likely as not" standard requires.

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VA Claims Insights • Secondary Service Connection

GERD Secondary to PTSD: What a VA Nexus Letter Must Show

July 20, 2026 • 6 min read

How veterans can support a VA claim for GERD secondary to PTSD with a physician-authored nexus letter: the "at least as likely as not" standard, medical rationale, and common denial reasons.

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VA Claims Insights • DIC & Survivor Claims

DIC Claims: How a Cause-of-Death Nexus Letter Helps Surviving Spouses

July 16, 2026 • 6 min read

How a physician cause-of-death nexus letter supports DIC claims when the death certificate does not name the service-connected condition — contributory causes explained.

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VA Claims Insights • Direct Service Connection

Nexus Letter for Tinnitus: Why the VA's Most-Claimed Condition Still Gets Denied

July 16, 2026 • 6 min read

Why tinnitus VA claims get denied — delayed onset, missing noise-exposure documentation, weak C&P rationale — and what a strong physician nexus letter must address.

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VA Claims Insights • Secondary Service Connection

Nexus Letter for Sleep Apnea Secondary to PTSD: What It Needs to Show

July 14, 2026 • 6 min read

What a strong VA nexus letter for sleep apnea secondary to PTSD must address: the current diagnosis, the service-connected condition, the medical link, and the "at least as likely as not" standard.

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