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Gastroenterology · Independent Medical Opinion / Nexus Letter

Crohn's Disease Nexus Letter for VA Disability Claims

Expert nexus letters and DBQs for Crohn's disease VA disability claims, covering direct service connection, secondary connection through the gut-brain-immune axis, causation and aggravation analysis, and severity documentation under the new DC 7326 criteria and the legacy DC 7323 analog ratings.

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Diagnostic Code
DC 7326
DC 7323 by analogy for legacy claims
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VA Rating Criteria

How the VA Rates Crohn's Disease

Two frameworks exist. Which one applies depends on when your claim was filed.

Current Criteria: DC 7326 (claims received or pending on or after May 19, 2024)

Rating

Criteria

100%

Severe inflammatory bowel disease that is unresponsive to treatment, requires hospitalization at least once per year, and results in either an inability to work or recurrent abdominal pain associated with at least two of a list of specified findings

60%

Moderate inflammatory bowel disease managed on an outpatient basis with immunosuppressants or other biologic agents, characterized by recurrent abdominal pain, four to five daily episodes of diarrhea, and intermittent signs of toxicity such as fever, tachycardia, or anemia

30%

Mild to moderate inflammatory bowel disease managed with oral and topical agents other than immunosuppressants or biologic agents, characterized by recurrent abdominal pain with three or fewer daily episodes of diarrhea and minimal signs of toxicity such as fever, tachycardia, or anemia

10%

The minimum compensable evaluation, for disease of lesser severity than the 30 percent criteria

Documentation notes: the diagnosis must be confirmed by endoscopy or radiologic studies. Following colectomy or colostomy with persistent or recurrent symptoms, the condition is rated under DC 7326 or the large intestine resection code, whichever produces the higher evaluation. Small intestine resection carries its own diagnostic code. Where coexisting digestive conditions produce non-overlapping symptoms, the schedule permits elevating the evaluation to the next higher level under the predominant code. We review the exact criteria text against your record during the consultation.

Legacy Framework: DC 7323 by analogy (claims filed before May 19, 2024)

Rating

Criteria

100%

Pronounced, resulting in marked malnutrition, anemia, and general debility, or with serious complication such as liver abscess

60%

Severe, with numerous attacks a year and malnutrition, the health only fair during remissions

30%

Moderately severe, with frequent exacerbations

10%

Moderate, with infrequent exacerbations

Medication note for legacy claims: because these criteria contain no reference to medication, VA caselaw provides that a higher rating may not be denied on the basis of relief provided by medication. The revised DC 7326 builds treatment intensity into the criteria directly, which changes that analysis for claims it governs. Claims pending on May 19, 2024 are evaluated under whichever framework is more favorable.

Sources: 38 CFR 4.114, DC 7326 and DC 7323; 89 Fed. Reg. 19,735 (Mar. 20, 2024), effective May 19, 2024; 38 CFR 3.317.

About Crohn's Disease Nexus Letter for VA Disability Claims VA Claims

Crohn's disease is an inflammatory bowel disease in which the immune system attacks the digestive tract itself. Unlike ulcerative colitis, which stays in the colon, Crohn's can involve any part of the tract from the mouth to the anus, most often the end of the small intestine, and the inflammation runs through the full thickness of the bowel wall. That depth is what produces the complications the disease is known for: strictures that narrow the bowel, fistulas that tunnel between organs, abscesses, malabsorption, and weight loss. Typical onset falls in young adulthood, which is exactly the window most veterans are in uniform, and the disease often smolders for years before a scope finally names it. Bowel complaints scattered through service treatment records and a Crohn's diagnosis a decade later are frequently the same disease at two points in time.

Two claim routes dominate. Direct service connection applies where symptoms began or worsened during service, even if the diagnosis came later; the opinion's job is to connect the in-service picture to the eventual diagnosis through the natural history of the disease. Secondary service connection runs through the gut-brain-immune axis: peer-reviewed research describes how chronic stress from conditions like PTSD contributes to immune dysregulation, increased intestinal permeability, and altered microbiome composition, mechanisms that can trigger or worsen inflammatory bowel disease. In Crohn's claims specifically, the aggravation theory is often the better supported of the two, and an opinion that never separates causation from aggravation leaves the rater without an answer on either. One route that does not apply: Crohn's is a structural, diagnosed disease, so it is not among the functional gastrointestinal disorders presumed under 38 CFR 3.317 for Gulf War service. IBS is on that list. Crohn's is not.

The rating side changed fundamentally on May 19, 2024. For decades Crohn's had no diagnostic code of its own and was rated by analogy, usually under DC 7323, the ulcerative colitis code. The revised schedule gave it a dedicated code, DC 7326, rated 10, 30, 60, or 100 percent, and the tiers are built on something new: treatment intensity. Disease managed with oral and topical agents sits at 30 percent. Disease requiring immunosuppressants or biologics on an outpatient basis sits at 60 percent. Disease unresponsive to treatment with at least yearly hospitalization reaches 100 percent, alongside daily diarrhea counts and signs of toxicity such as fever, tachycardia, and anemia. Veterans already rated for Crohn's keep their existing rating, and claims pending on the effective date are evaluated under both versions with the more favorable applied.

The practical consequence is that your medication list is now rating evidence. A veteran on adalimumab or infliximab is describing the 60 percent tier every time they refill the prescription, whether or not anyone has said so in the file. Daily episode counts, documented fevers and tachycardia during flares, anemia labs, and hospitalization records are the other columns the new criteria read. And where multiple digestive conditions coexist, the schedule permits elevation to the next higher level when non-overlapping symptoms warrant it, a mechanism the VA itself illustrated using Crohn's disease in the final rule.

While no medical opinion can guarantee a specific VA outcome, clear, credible, and well-documented evidence gives a claim its strongest foundation. Our role is the medicine and the documentation. The decision on the claim rests with the VA.

What's Included

Nexus letters connecting in-service bowel symptoms to a later Crohn's diagnosis, explaining the disease's natural history and why the two pictures belong to the same process
Nexus letters for Crohn's secondary to PTSD, anxiety, or chronic stress, with the gut-brain-immune mechanism written in full and supported by peer-reviewed literature
Causation and aggravation addressed as separate questions, with baseline severity analysis where aggravation applies
DBQ completion documenting treatment tier, daily episode frequency, toxicity signs, hospitalizations, and nutritional impact against whichever framework governs your claim
Documentation of resection residuals, fistulizing and stricturing complications, and identification of separately ratable manifestations and treatment side effects
Secondary Service Connections

How Crohn's Disease Nexus Letter for VA Disability Claims Connects to Service

These are the medical pathways our clinicians use to establish nexus between crohn's disease nexus letter for va disability claims and military service:

🔗
Chronic PTSD → Crohn's Disease Nexus Letter for VA Disability Claims
The gut-brain-immune axis links sustained stress to immune dysregulation and intestinal inflammation that can trigger or worsen the disease. Causation and aggravation must be addressed separately, and aggravation is often the stronger theory.
🔗
Anemia, Malabsorption, Weight Loss → Crohn's Disease Nexus Letter for VA Disability Claims
Transmural small bowel inflammation impairs nutrient absorption, producing the toxicity and nutritional findings the rating tiers ask about. Labs documenting them are rating evidence.
🔗
Medication Side Effects → Crohn's Disease Nexus Letter for VA Disability Claims
Long-term corticosteroids, immunosuppressants, and biologics carry documented effects on bone density, infection risk, and other systems. The resulting conditions are separately claimable.
🔗
Depression, Anxiety, Insomnia → Crohn's Disease Nexus Letter for VA Disability Claims
Unpredictable flares, dietary restriction, and social limitation are recognized contributors to mood disorders. These opinions require a psychiatrist or doctoral-level psychologist.
Specialist Guide

Who Should Write Your Crohn's Disease Nexus Letter for VA Disability Claims?

Match the writer to the medical question for maximum probative weight:

Gastroenterologist
Where the diagnosis or disease extent is contested, where colonoscopy, biopsy, or enterography findings need specialist interpretation, or where a specialist examiner issued the negative opinion.
$1,600+
Internal Medicine
Established diagnoses where the question is causation, aggravation, or the secondary chain, including treatment side effects reaching into other systems. Every supported theory in one letter.
$945
Nurse Practitioner
Well-documented disease with a clear in-service symptom record and a narrow medical question. Many are former C&P examiners.
From $400
Read the full Specialist Guide →

Frequently Asked Questions

About Crohn's Disease Nexus Letter for VA Disability Claims

Yes, through three routes. Direct service connection applies where the disease began or worsened during service, which is common because typical onset falls in the age window when most veterans serve. Secondary service connection applies where a service-connected condition such as PTSD caused or aggravated the disease through the gut-brain-immune axis. Aggravation applies where a pre-existing condition got permanently worse in service. A nexus letter explains the medical connection. Whether any claim succeeds is a determination for the VA.

For claims received or pending on or after May 19, 2024, Crohn's disease is rated under its own code, DC 7326, at 10, 30, 60, or 100 percent. The tiers are driven by treatment intensity, daily diarrhea episodes, and signs of toxicity such as fever, tachycardia, or anemia: oral and topical agents at 30 percent, outpatient immunosuppressants or biologics at 60 percent, and treatment-unresponsive disease with at least yearly hospitalization at 100 percent. Before that date, Crohn's had no code of its own and was typically rated by analogy under DC 7323, the ulcerative colitis code, on exacerbation frequency and constitutional impact. Claims pending on the effective date are evaluated under whichever framework is more favorable.

Crohn's disease received its own diagnostic code for the first time. DC 7326 replaced decades of rating by analogy, and its tiers read directly off treatment records: what you take, how often you go, and what your labs show during flares. Two things came with it. Diagnoses under DC 7326 must be confirmed by endoscopy or radiologic studies. And veterans already rated for Crohn's keep their existing rating under the old criteria, while pending claims are evaluated under both versions with the more favorable applied.

Yes. Peer-reviewed research on the gut-brain-immune axis describes how chronic stress contributes to immune dysregulation, increased intestinal permeability, and altered microbiome composition, mechanisms that can trigger or worsen inflammatory bowel disease. In Crohn's claims specifically, the aggravation theory is often the better supported of the two: the literature on stress worsening disease course and flare frequency is stronger than the literature on stress as a sole cause. A useful opinion says so honestly and builds the claim on the theory the evidence actually carries.

Causation means the service-connected condition produced the Crohn's disease. Aggravation means the disease existed independently but the service-connected condition made it permanently worse beyond its natural progression. They are separate legal theories with separate medical questions, and an opinion that addresses only one leaves the rater without an answer on the other. Where aggravation applies, the opinion should also address the baseline severity before aggravation.

No. The Gulf War presumption under 38 CFR 3.317 covers functional gastrointestinal disorders, conditions diagnosed from symptom patterns, such as IBS. Crohn's disease is a structural, diagnosed disease confirmed by endoscopy and biopsy, so it is not on that list. Crohn's claims proceed on direct or secondary theories instead, which is exactly where a nexus opinion does its work. Veterans with both IBS-type symptoms and later-diagnosed Crohn's should have the record reviewed carefully, because the diagnostic history affects which routes are open.

Delayed diagnosis is the normal fact pattern, not a defect. Crohn's often smolders for years before it is scoped, and service treatment records showing recurrent abdominal pain, diarrhea, or unexplained weight change without a name are frequently the early chapters of the disease diagnosed later. A useful opinion addresses the interval directly, explaining the natural history of the disease and why the in-service picture and the later diagnosis belong to the same story.

For claims rated under DC 7326, yes: the diagnosis must be confirmed by endoscopy or radiologic studies. In practice nearly every Crohn's diagnosis already rests on colonoscopy with biopsy or cross-sectional imaging such as CT or MR enterography, so the requirement is usually about getting those reports into the claim file rather than getting new testing. Those same reports also document disease location and extent, which supports the severity picture.

Under the revised DC 7326, being managed on an outpatient basis with immunosuppressants or biologic agents is itself part of the 60 percent tier's language. The medication that controls the disease is simultaneously evidence of its severity, so a well-controlled veteran on adalimumab is not automatically a low-rated one. For legacy claims rated by analogy under DC 7323, a different principle applies: those criteria contain no reference to medication, and VA caselaw provides that a higher rating may not be denied on the basis of relief the medication provides. Either way, a file rated down simply because the biologic is working deserves a second look.

Yes. Under DC 7326, the 100 percent level is reserved for severe disease that is unresponsive to treatment, requires hospitalization at least once per year, and results in inability to work or recurrent abdominal pain with specified associated findings. Under the legacy analog criteria, 100 percent required pronounced disease with marked malnutrition, anemia, and general debility, or a serious complication. In both frameworks the findings have to be documented, not just experienced, which makes hospitalization records and work impact evidence central.

Following colectomy or colostomy with persistent or recurrent symptoms, the condition is rated under DC 7326 or the large intestine resection code, whichever produces the higher evaluation. Resection of the small intestine is rated under its own diagnostic code. That comparison has to actually be made, and the post-surgical symptom record is what feeds it. Ongoing diarrhea, malabsorption, and nutritional findings after surgery are rating evidence, not background.

Most digestive codes, including DC 7326, sit inside the single evaluation rule of 38 CFR 4.114: one rating is assigned under the code reflecting the predominant disability. But the schedule permits elevating that rating to the next higher level where coexisting conditions add non-overlapping symptoms, a mechanism the VA illustrated in the final rule using Crohn's disease itself. GERD under the revised DC 7206 sits outside that rule, so it can be rated separately for claims governed by the new criteria. Getting this structure right is worth real money and is part of what we review.

Medically, ulcerative colitis is limited to the colon and involves continuous inflammation of its lining, while Crohn's can affect any part of the digestive tract from the mouth to the anus, with inflammation running through the full bowel wall. That depth is why Crohn's produces fistulas and strictures. For rating purposes under the revised schedule, both are evaluated under the same inflammatory bowel disease criteria at DC 7326, so the rating analysis converges. The nexus opinion still has to match the actual diagnosis, because the disease course it describes must be the right one.

It is the medical-evidentiary standard used in nexus opinions. It means the probability of a connection is at least 50 percent, as likely as not. A clinician uses it to state, in medical terms, whether a condition is reasonably connected to service. It is a medical opinion, not a legal determination.

A discovery call is a no-obligation conversation about your diagnosis, your service history, and your goals. We talk through which route fits, whether direct connection from in-service symptoms, the gut-brain-immune secondary theory, or aggravation, and which rating framework governs your claim. Bring your rating decision, your colonoscopy and imaging reports, your medication history, and any hospitalization records. There is no pressure to proceed. If a letter would not add value to your claim, we will tell you that instead.

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Looking for a DBQ instead? Disability Benefits Questionnaires are handled within our separate DBQ service. This page covers the Crohn's Disease Nexus Letter for VA Disability Claims.