Medical Evidence for Digestive and Internal Medicine VA Claims

Digestive and endocrine claims are decided on paper. No rater meets the veteran; a reviewer reads a file and applies criteria to what is written in it. Two veterans with identical conditions can receive very different outcomes based entirely on what their records document.

This guide explains what the VA looks for, in the order a reviewer looks for it, and where these claims most often fall apart.

One: a current diagnosis

Every claim begins here, and it is where a surprising number end. The VA rates diagnosed disabilities, not symptoms. 'Stomach problems,' 'acid,' and 'fatigue' are not ratable; gastroesophageal reflux disease, irritable bowel syndrome, diabetes mellitus, and hypothyroidism are.

The diagnosis must be current - established during the claim period, not fifteen years ago. Where a condition was diagnosed long ago and never treated since, the file needs something recent confirming it persists.

Two: evidence of the in-service event or exposure

The VA needs something that happened in service to connect the condition to. In this cluster that is usually one of:

• Service treatment records documenting gastrointestinal complaints, even brief sick call entries with no diagnosis attached
• An abnormal laboratory value in the service record - an elevated glucose or thyroid-stimulating hormone result that was never followed up
• Documented treatment for an acute gastrointestinal illness during a deployment
• Qualifying herbicide exposure for a presumptive diabetes claim
• Qualifying Persian Gulf service for a claim under 38 CFR 3.317
• The rating decision establishing the service-connected condition a secondary claim is built on

Three: the medical nexus

Outside of a presumption, the claim turns on a medical opinion connecting the current condition to service. The VA's standard is at least as likely as not - a 50 percent or greater probability - which is lower than most veterans assume and far lower than medical certainty.

What distinguishes a useful opinion is reasoning. A rater weighing a one-paragraph letter that states a conclusion against a detailed examination report has an easy decision. An opinion that identifies the records relied on, explains the mechanism, addresses the timeline including any gap in treatment, and confronts alternative explanations is much harder to set aside.

This is the single most common gap in these claims: the condition is real, the service connection is plausible, and nobody put a reasoned medical opinion in the file.

Four: severity documentation

Service connection establishes entitlement; severity documentation determines the percentage. Each condition in this cluster is measured by something specific:

• GERD - endoscopy, esophagram, or pH study findings, records of any dilatation with dates, medication history, and weights over time, as the rating criteria require
• IBS - a contemporaneous log of abdominal pain and bowel disturbance frequency, because the criteria count episodes
• Diabetes - laboratory values, the medication regimen, and an explicit clinical restriction on activity where one exists, which is what the 40 percent level requires
• Thyroid conditions - laboratory values across time, dose adjustments, and separate diagnoses for any conditions claimed alongside, as covered in the thyroid rating guide

Five: lay evidence, used correctly

Veterans are competent to describe what they personally experienced - symptoms, their frequency, and their effect on daily life. Family members, coworkers, and fellow service members can describe what they observed. This evidence is not a substitute for a diagnosis, but it fills gaps that medical records cannot.

The most useful lay statements are specific. 'He has stomach trouble' tells a rater nothing. 'Between 2019 and 2024 he left work early at least twice a month because of abdominal pain, and stopped attending family meals because of dietary restrictions' describes a pattern a rater can evaluate against the criteria.

Where these claims break down

The recurring failures are consistent across this whole cluster:

• A long gap in treatment with no explanation - the gap itself is not fatal, but an opinion that ignores it invites the conclusion that the condition resolved
• Symptoms managed with over-the-counter medication for years, leaving no record of severity
• A secondary claim filed before the primary condition is service connected
• An aggravation theory with no documented baseline, which 38 CFR 3.310(b) requires
• Multiple digestive diagnoses claimed separately without regard to the limits in 38 CFR 4.114 on combining evaluations
• Complications of diabetes that are documented in the record but were never claimed

What a records review actually does

A medical records review is not a nexus letter and not a promise of an outcome. It is a licensed physician reading the file the way a reviewer would and reporting what the evidence supports - which conditions have a documented basis, where the record is thin, and what is missing.

For veterans who are uncertain whether their file supports anything, that answer is the useful one to get first, before paying for a document that the record may not support.

Where veterans start

Every case is different, and there is no obligation at any step. A paid medical records review is a $250 flat fee, refunded in full if nothing supportable is identified. Where the records support one, a nexus letter is the medical opinion addressing the link.

For the full framework behind these claims, start with how service connection works for digestive and internal medicine conditions.