Crohn's Disease VA Claims Guide

Crohn's disease is a form of inflammatory bowel disease (IBD): a structural, autoimmune disease that causes real, visible inflammation anywhere from the mouth to the anus. As of the May 19, 2024 digestive-system update, the VA rates Crohn's under its own diagnostic code, DC 7326, on a ladder from 10 to 100 percent that keys off severity, the treatment controlling it, and signs of systemic toxicity. This guide walks the whole path: how service connection works, the direct, toxic-exposure, and secondary pathways, the rating levels and the 2024 change, the evidence that wins, why these claims get denied, a checklist before you file, what the claims process looks like step by step, how to read your decision letter, and what to do whether you win or you're denied. It is a reference, not advice about your specific claim.

Last updated: July 2026 · Educational use only. Not legal advice. Verify current rules at VA.gov or eCFR.

What Crohn's Disease Is

Crohn's is one of the two main inflammatory bowel diseases; ulcerative colitis is the other. Unlike irritable bowel syndrome, which is "functional" and shows normal scopes, Crohn's is structural: it produces inflammation and tissue damage that is confirmed on endoscopy or imaging. It can affect any part of the digestive tract and tends to involve the full thickness of the bowel wall, which is why complications like strictures, fistulas, and abscesses are part of the picture. The diagnosis must be confirmed by endoscopy or radiologic study, and that requirement is written into how the VA rates it.

Crohn's disease is not a listed chronic disease under 38 CFR § 3.309(a), and it is a structural, not functional, disorder, so it does not ride the Gulf War undiagnosed/functional-illness presumptive at 38 CFR § 3.317 the way irritable bowel syndrome can. Every Crohn's claim has to be built on a real diagnosis and a real connection to service.

How Service Connection Works, At a High Level

Before getting into the specific pathways below, it helps to understand the three things every Crohn's disease claim ultimately has to show. This is the same basic test that applies to any VA disability claim (Shedden v. Principi, 381 F.3d 1163 (Fed. Cir. 2004)), just applied to this condition.

A current diagnosis. You must actually have Crohn's disease now, confirmed by medical testing such as a colonoscopy or biopsy. One published Board decision denied a claim because a CT scan showed no active inflammation and there was no confirmed diagnosis on testing.
An in-service event, or a service-connected condition behind it. Your records should show something in service that ties to the disease, such as documented stomach or bowel symptoms, or a qualifying toxic exposure, or a disability VA has already service-connected that caused or worsened the Crohn's. Where service records showed in-service diarrhea and cramping, the Board has found the in-service part met.
A medical nexus. A doctor's opinion connecting your Crohn's to service, or to the service-connected condition, and explaining the reasoning, not just stating a conclusion. Published grants almost always had a private doctor's opinion that reviewed the file and explained its reasoning.

You don't always have to prove all three yourself. VA sometimes concedes the diagnosis, and occasionally the in-service event too, leaving only the medical nexus genuinely in dispute. Knowing which of the three elements is actually contested in your case tells you where to focus your evidence. The VA must give you the benefit of the doubt when the evidence for and against a claim is roughly equal (38 CFR § 3.102; 38 U.S.C. § 5107(b)). See the Service Connection Guide for how this test works generally.

What VA Looks For: Tests, Records, and Diagnostic Codes

Whether you are filing directly, on a toxic-exposure theory, or secondary to another condition, the record VA actually reviews centers on a small set of documents and data points.

The confirming test itself: a colonoscopy, endoscopy, or radiologic study report identifying active inflammation and, where relevant, biopsy results. Confirmation by endoscopy or radiologic study is written into the DC 7326 rating criteria; a scan showing no active inflammation can sink the diagnosis element on its own.
Treatment records naming the medication: whether you are managed with oral/topical agents, or with an immunosuppressant or biologic (Humira, Remicade, Stelara, methotrexate, and similar), is written directly into the rating ladder.
A symptom-frequency record: the ladder turns on three-or-fewer, four-to-five, or six-or-more daily diarrhea episodes, plus any documented signs of systemic toxicity (fever, tachycardia, or anemia).
The diagnostic codes involved: DC 7326 for Crohn's disease itself, plus whatever code applies to the condition you're connecting it to, for example DC 9434 (depression/anxiety), or the condition it may be secondary to.
The actual form the examiner fills out: the intestinal-conditions Disability Benefits Questionnaire (DBQ), discussed in more detail later in this guide.

How Crohn's Disease Gets Service Connected

Crohn's is not on a presumptive list. As a diagnosable autoimmune disease, it does not ride the Gulf War functional-illness presumptive (38 CFR 3.317) the way IBS can. It is established by the ordinary paths: direct, toxic exposure, and secondary.

Direct Service Connection

A current diagnosis, an in-service event or symptom onset, and a medical nexus. Service treatment records showing unexplained abdominal pain, chronic diarrhea, or weight loss during service strengthen the timeline even when the formal diagnosis came after separation. Direct causation remains available even for a condition that is not on any presumptive list (Combee v. Brown, 34 F.3d 1039 (Fed. Cir. 1994)). See service connection.

Continuity of symptoms can carry a direct claim without a formal in-service diagnosis. When the same symptoms ran continuously from service to your later diagnosis, the Board can grant even without a documented diagnosis during service (38 CFR § 3.303(d)). Your own credible statements about symptoms are competent evidence of what you experienced (Layno v. Brown, 6 Vet. App. 465 (1994); Jandreau v. Nicholson, 492 F.3d 1372 (Fed. Cir. 2007)), even though the cause of the disease itself is a medical question a layperson cannot answer alone.

Toxic Exposure

Crohn's is not a presumptive toxic-exposure condition, but documented exposure can support a direct nexus. Burn pits and airborne hazards, Gulf War service, or contaminated water at Camp Lejeune are raised as direct-nexus theories where the evidence shows exposure and a medical link. The Board has granted IBD as related to a toxic-exposure risk activity on that kind of record, for example where a doctor tied a veteran's Crohn's to in-service firefighting foam and PFAS chemicals, citing supporting military and medical research. Because Crohn's is not automatically presumed connected to any exposure, the medical opinion has to supply the science, not just the exposure history. See PACT Act and toxic-exposure appeals.

Camp Lejeune water is not a shortcut for Crohn's. Crohn's disease is not one of the presumptive conditions for Camp Lejeune contaminated water (38 CFR § 3.309(f)), so conceded exposure alone does not win it. Published decisions have denied Crohn's claims even where the VA agreed the veteran was exposed, because the medical evidence did not connect the chemicals to Crohn's and the disease appeared decades later.

Established secondary pathways include:

Secondary to Mental Health Conditions (the Gut-Brain Axis)

Research connects PTSD and chronic stress to inflammatory bowel disease through stress-hormone and immune disruption. A nexus opinion can tie Crohn's onset or worsening to service-connected PTSD, anxiety, or depression (DC 9434, 38 CFR § 4.130). See the PTSD guide.

Secondary to Another Service-Connected Condition

If Crohn's was caused or worsened by another condition the VA already covers, you can win on that basis (38 CFR § 3.310). Published decisions have granted Crohn's as secondary to a service-connected endocrine condition, and, through a surviving spouse, a related bowel and liver condition as caused by a service-connected skin condition. Conditions like psoriasis share immune-mediated roots with Crohn's, and a documented service-connected autoimmune condition can support this kind of secondary theory. A secondary opinion should address both causation and aggravation; an opinion that addresses only one has been found inadequate (El-Amin v. Shinseki, 26 Vet. App. 136 (2013)).

Medication-Induced

Long-term medication taken for a service-connected condition that aggravates the GI tract can support a secondary theory under 38 CFR § 3.310, the same intermediate-step logic used for other conditions. The opinion should name the specific medication and the mechanism by which it affects the digestive tract.

Reserve and National Guard training time is not automatically treated like full active duty. If your service was active duty for training or inactive duty for training, you generally must show a disease or injury actually happened in the line of duty during that specific period to qualify. A claim resting only on reserve training time, with no in-service event during a qualifying period, has been denied on that basis.

How the VA Rates Crohn's Disease, DC 7326

The 2024 criteria rate Crohn's on severity, the treatment that controls it, and signs of systemic toxicity (fever, tachycardia, or anemia). Whether you are on a biologic or immunosuppressant is built directly into the ladder.

100%Severe, unresponsive to treatment

Severe inflammatory bowel disease unresponsive to treatment, requiring hospitalization at least once per year, and either causing inability to work or recurrent abdominal pain with at least two of: six or more daily episodes of diarrhea; six or more daily episodes of rectal bleeding; recurrent rectal incontinence; or recurrent abdominal distension.

60%Moderate, on immunosuppressants or biologics

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

30%Mild to moderate, oral/topical agents only

Mild to moderate inflammatory bowel disease managed with oral and topical agents (other than immunosuppressants or biologics), with recurrent abdominal pain, three or fewer daily episodes of diarrhea, and minimal signs of toxicity.

10%Minimal to mild, no systemic toxicity

Minimal to mild symptomatic inflammatory bowel disease managed with oral or topical agents (other than immunosuppressants or biologics), with recurrent abdominal pain, three or fewer daily episodes of diarrhea, and no signs of systemic toxicity.

The treatment you are on is part of the rating. Being on a biologic or immunosuppressant on an outpatient basis (Humira, Remicade, Stelara, methotrexate, and similar) is written into the 60 percent level. After a colectomy or colostomy with persistent symptoms, the VA rates under DC 7326 or DC 7329 (resection of the large intestine), whichever gives the higher rating. Make sure the file clearly shows what you take and any surgeries, not just symptoms.

Go deeper: open the full DC 7326 breakdown

What the VA measures at your C&P exam
Evidence that has won at the Board
Inside the rater's playbook: grant, denial, and remand rates
Secondary condition map

See the full DC 7326 breakdown →

The 2024 Change, and the Increase Opportunity

Before May 19, 2024, Crohn's had no dedicated diagnostic code and was rated by analogy, usually under ulcerative colitis (DC 7323), or, for older periods, under the pre-2024 version of 38 CFR § 4.114, Diagnostic Code 7319, where 30 percent was the maximum for Crohn's rated by analogy, given for severe diarrhea or alternating diarrhea and constipation with near-constant abdominal distress. The digestive-system amendment created DC 7326 for Crohn's and inflammatory bowel disease and rewrote the criteria around treatment and toxicity, reaching up to 100 percent for severe disease.

The VA does not automatically re-rate you under the new criteria. If you were rated under the old system and your Crohn's is now controlled by a biologic or immunosuppressant, or has worsened, being considered under the new 60 and 100 percent levels generally requires filing for an increased evaluation. Claims pending on May 19, 2024 are considered under both old and new criteria, whichever is more favorable. For older periods still being decided, the Board may also rate Crohn's by analogy to ulcerative colitis to allow a higher rating. A long-standing protected rating is not cut just for asking, but read the rating-protection rules first.

The VA cannot count the improvement from your medication under the older analogy code. Where a claim is still being rated by analogy under the pre-2024 criteria, the VA may not consider the ameliorative effects of medication in judging severity, since Diagnostic Code 7319 does not itself contemplate medication as a rating factor (Jones v. Shinseki, 26 Vet. App. 56 (2012)). Describe how bad your symptoms are without treatment, not just how well the medication controls them.

Evidence That Wins These Claims

Across the Board's published DC 7326 decisions, a private nexus opinion in the file goes with a much higher grant rate, shown below.

A confirmed diagnosis: the endoscopy or imaging report. Confirmation by endoscopy or radiologic study is part of the rating criteria. Claims have been denied where a CT scan showed no active inflammation and no diagnosis was confirmed on testing.
Treatment records that name the medication. Whether you are on a biologic or immunosuppressant is built into the 60 percent level.
A symptom diary recording daily diarrhea episodes, which separate the rating levels.
Hospitalization records, which feed the 100 percent level, and any surgical records (colectomy, resection).
The intestinal-conditions DBQ, which captures episode frequency, toxicity signs, and treatment type. See the DBQ guide.
Service treatment records marked for GI complaints: any stomach, bowel, diarrhea, or cramping entries during service strengthen the in-service element, even when the formal diagnosis came later. Documented in-service diarrhea, cramping, or gastritis that continued after service has supported grants.
A nexus letter for service connection, or a buddy/lay statement on symptom continuity since service, tying the timeline together with your own dated statements. The strongest opinions come from a treating provider, often a gastroenterologist, who reviewed the full record and explained the reasoning, not just stated a conclusion; the value of a medical opinion comes from its reasoning (Nieves-Rodriguez v. Peake, 22 Vet. App. 295 (2008)). See nexus letters and buddy statements.
A record of any toxic exposure you're relying on, paired with medical literature connecting that specific exposure to Crohn's, if you're raising a toxic-exposure theory.
A challenge to any VA exam built on a mistake. A missing diagnosis in service is not proof against you, because the absence of evidence is not itself negative evidence, and an opinion that demands medical certainty instead of the "at least as likely as not" standard is inadequate. Read the exam and point out any factual or legal error.

Why These Claims Get Denied

Among the Board's published DC 7326 service-connection denials, a few specific patterns show up often enough to call out on their own.

A diagnosis alone, with nothing tying it to service. Having Crohn's now is not enough; you still need an in-service cause and a link. Claims have been denied where the veteran had a clear diagnosis, but nothing in service tied to it and the diagnosis came decades after discharge.
Only the veteran's own word for the medical link. You are competent to describe your symptoms, but a layperson cannot prove the cause of a complex disease like Crohn's on their own (Jandreau v. Nicholson). When the only nexus evidence is the veteran's own say-so, the VA is not even required to order an exam (Waters v. Shinseki, 601 F.3d 1274 (Fed. Cir. 2010)).
Toxic or Camp Lejeune exposure argued alone. Crohn's is not on the Camp Lejeune presumptive list, so conceded exposure alone does not win it. Claims have been denied even where the VA agreed the veteran was exposed, because the medical evidence did not connect the specific chemicals to Crohn's, and the disease appeared roughly 40 years later in at least one published case.
A long, unexplained gap between service and diagnosis. A large time gap with no symptoms documented in between weighs heavily against a claim. One claim was denied where the first sign of Crohn's came about 20 years after service and a later colonoscopy showed no inflammatory bowel disease at all. Be ready to fill that gap with records or credible evidence of ongoing symptoms.
Other risk factors an examiner can use against you. Examiners look for non-military causes of Crohn's such as smoking, family history, and ethnicity. In one case a favorable opinion was rejected partly because it wrongly claimed the veteran had no other risk factors, when he was in fact a former smoker. Address these head-on with your doctor rather than leaving them for the examiner to raise first.
Reserve or National Guard training time treated like full active duty. A claim resting only on active duty for training or inactive duty for training generally still needs to show the disease or injury happened in the line of duty during that specific period.

Common Mistakes

Distinct from the reasons a claim gets denied on the merits above, these are procedural and paperwork mistakes that undersell a claim even when the underlying facts are strong.

Records that don't name the treatment. The 60 percent level requires being on a biologic or immunosuppressant. A file that documents symptoms but not the medication leaves the rater without the fact that sets that level.
No diarrhea-frequency record. The ladder turns on three-or-fewer, four-to-five, or six-or-more daily episodes. Notes that describe "frequent diarrhea" without a count leave the percentage unsupported.
An old rating left untouched. A pre-2024 rating, often assigned by analogy under 7319 or 7323, is not updated automatically; reaching the new 60 or 100 percent level generally requires filing for an increase.
Treating Crohn's like IBS. IBS (DC 7319) caps at 30 percent and needs no scope; Crohn's requires endoscopic confirmation and can reach 100 percent. Filing the wrong one undersells a far more serious disease.
Skipping the effective-date paperwork. The effective date is usually the date the VA received your claim, so a delay in filing, or in filing an intent to file, can cost real back pay; one veteran was held to a much later effective date because nothing earlier was on file.

Do's and Don'ts

A condensed version of everything above, in the order it actually matters when you sit down to build your file.

Confirm you have a current Crohn's diagnosis documented by colonoscopy or biopsy in your records.
Pull your service treatment records and mark every stomach, bowel, diarrhea, or cramping complaint.
Get a private doctor, ideally a gastroenterologist, to review your file and write a nexus opinion that explains its reasoning, not just a conclusion.
List any condition the VA already covers that could have caused or worsened your Crohn's, for a secondary claim.
Collect evidence of continuous symptoms from service up to your diagnosis, including your own dated statements.
If you claim a toxic exposure, gather medical research linking that specific exposure to Crohn's.
Read every VA exam and note any factual error or wrong legal standard so you can challenge it.
File promptly, or file an intent to file, since the effective date generally runs from when VA received your claim.

Don't

Don't assume a diagnosis alone wins the claim, you still need the in-service cause and the connection.
Don't rely only on your own opinion about what caused it, causation for Crohn's is treated as a medical question.
Don't count on Camp Lejeune or toxic-water exposure making the claim automatic, Crohn's is not on that presumptive list.
Don't ignore a long, unexplained gap between service and diagnosis, be ready to fill it with records or credible testimony.
Don't let your doctor's opinion overlook other risk factors like smoking or family history, address them directly.
Don't assume reserve or National Guard training time counts the same as full active duty for the in-service element.
Don't leave an old pre-2024 rating unexamined if your Crohn's is now controlled by a biologic or has worsened.

Secondary Conditions Crohn's Commonly Causes

Crohn's reaches well beyond the gut. These complications, sometimes called extraintestinal manifestations, are frequently rated as their own service-connected conditions once Crohn's is service-connected, each with its own diagnosis and nexus.

Arthritis and joint pain. Up to a third of people with Crohn's develop inflammatory joint disease, part of the spondyloarthritis family, affecting the knees, hips, or spine.
Perianal fistulas and skin lesions. Infected tunnels near the anus and other skin involvement that may require surgery and can be rated separately.
Anemia. From chronic intestinal blood loss or poor absorption of iron, B12, or folate.
Mental health conditions. Depression, anxiety, and insomnia tied to chronic pain, dietary limits, and the unpredictability of flares, rated under 38 CFR 4.130.
Colorectal cancer risk. Long-standing inflammation raises colorectal cancer risk; a cancer diagnosis linked to chronic Crohn's inflammation can be claimed as secondary.

See the secondary conditions overview and the secondary map on the DC 7326 page.

Conditions that can cause Crohn's disease (Crohn's as the secondary)

Claims where Crohn's was argued as secondary to an already service-connected condition, the "ways to connect via another condition" list:

Conditions Crohn's can cause (Crohn's as the primary)

Conditions veterans have claimed as caused or aggravated by a service-connected Crohn's, in other words, conditions secondary to Crohn's once Crohn's itself is already service-connected:

Grant rate by exposure history

Because toxic exposure comes up so often in Crohn's claims, here is how published DC 7326 decisions split by era and exposure flag, against the all-claims baseline.

Quick Checklist Before You File

Bring these together before you submit anything.

Confirm you have a current Crohn's diagnosis documented by colonoscopy or biopsy in your records.
Pull your service treatment records and mark every stomach, bowel, diarrhea, or cramping complaint.
Get a private doctor, ideally a gastroenterologist, to review your file and write a reasoned nexus opinion.
List any condition the VA already covers that could have caused or worsened your Crohn's, for a secondary claim.
Collect evidence of continuous symptoms from service up to your diagnosis, including your own dated statements.
If you claim a toxic exposure, gather medical research linking that exposure to Crohn's.
Read every VA exam and note any factual error or wrong legal standard so you can challenge it.
If you were denied before: new and relevant evidence for a Supplemental Claim, not just a repeat of what was already considered.

For the mechanics of actually submitting the claim, see the Standard Claim Guide and the Fully Developed Claim Guide (filing with all your evidence up front can speed up the decision).

The Claims Process, Step by Step

Once you file, your claim moves through a series of hand-offs. Understanding who does what helps you know who to contact, and what to expect, at each stage.

You file the claim. Directly with VA, through VA.gov, or with the help of an accredited representative.
VA acknowledges the claim and assigns it for development. A Veteran Service Representative (VSR) is assigned to gather your service treatment records, VA and private medical records, and any other evidence needed.
The VSR orders a Compensation & Pension (C&P) exam if one is needed. Not every claim requires one, but most Crohn's claims do, especially where a nexus opinion or a toxic-exposure link is required.
The C&P exam is conducted. By a VA clinician or a contracted examiner, who completes the intestinal-conditions DBQ documenting the diagnosis, symptom frequency, toxicity signs, treatment, and, where relevant, a nexus opinion.
The file goes to a Rating Veteran Service Representative (RVSR), the "rater." The rater reviews the complete file, including the exam results, and decides whether service connection is warranted and at what percentage.
A senior reviewer may review the decision before it's finalized, depending on the complexity of the claim.
VA issues the decision letter. This states whether the claim is granted or denied, the rating percentage if granted, and the reasons behind the decision.
If you disagree, you choose an appeal lane. Higher-Level Review, Supplemental Claim, or a Board appeal, covered later in this guide.

Who's who: VSO vs. VSR vs. Rater vs. C&P Examiner

Your VSO

An accredited representative from a veterans service organization, or an accredited attorney or claims agent. Not a VA employee. Helps you prepare, gather evidence, and file, and can represent you through an appeal. Has no authority to decide your claim.

VSR (Veteran Service Representative)

VA staff who "develops" your claim: requests records, schedules the C&P exam, and assembles the file. Does not decide the rating.

Rater (RVSR)

VA staff who reviews the completed file and makes the actual decision, service connection or denial, and the percentage. This is the person whose judgment the decision letter reflects.

C&P Examiner

A VA clinician or a contracted medical examiner who conducts the exam and completes the DBQ. Documents findings and, where asked, a nexus opinion. Does not decide the claim.

For the full walkthrough of every stage with more detail, see Inside Your Claim and Claim Stages.

DBQs and Your C&P Exam

The intestinal-conditions Disability Benefits Questionnaire (DBQ) is the standardized form an examiner completes for your condition; it structures the exam findings into the specific data points VA's rating schedule requires (for Crohn's, that includes diarrhea frequency, toxicity signs, and treatment type). See the DBQ Guide for how these forms work, including whether a private DBQ completed by your own doctor can be submitted instead of relying solely on a VA exam.

Before your C&P exam, bring a clear, specific account of your symptoms, focus on your worst days and how the condition affects daily function, not just how you feel on an average day. Be consistent with what's already in your medical records and prior statements, and be ready to name every medication you take, since the treatment type drives the rating level. For a full walkthrough of what to expect and how to prepare, see the C&P Exam Prep Guide.

Reading Your Decision Letter, and What to Do If Denied

Your decision letter has two parts: a narrative section explaining the reasoning (often called "reasons and bases"), and a codesheet showing the actual rating percentage, the effective date, and the diagnostic code used. See the Reading Your Decision Letter Guide for how to find and interpret each part, or use the Letter Interpreter tool to upload your own letter and get a plain-English breakdown.

If your claim is denied, or the rating is lower than you expected, you have three main lanes:

Supplemental Claim: refile with new and relevant evidence, such as a new nexus opinion or updated colonoscopy/imaging. See Supplemental Claim Guide.
Higher-Level Review (HLR): a senior reviewer looks at the same evidence again for a difference of opinion, no new evidence is added. See HLR Guide.
Board Appeal: your case goes to a Veterans Law Judge at the Board of Veterans' Appeals, with options for a direct review, an evidence docket, or a hearing. See Board Appeal Guide.

Not sure which lane fits your situation? See the Appeals decision guide for a side-by-side comparison of all three.

After You Win: Getting the Right Rating and Maintaining It

Some claims aren't about first winning coverage at all, they're about whether an already-covered veteran is getting the size of payment, or the start date, the record actually supports. A few patterns from published decisions are worth knowing.

For start dates, the effective date is usually the date the VA received your claim, so file promptly or file an intent to file; a delay in getting anything on file can cost years of back pay.
A newer rule effective May 19, 2024 (DC 7326) can reach 100 percent for severe disease, and for older periods the Board may rate Crohn's by analogy to ulcerative colitis to allow a higher rating; one published decision reached a 100 percent rating plus extra housebound special monthly compensation this way.
If your Crohn's prevents you from working, you may also be able to pursue a 100 percent rate through Total Disability based on Individual Unemployability (TDIU), separate from the schedular rating.

A grant is not always the end of the story either way. Keep your treatment consistent, continued follow-up with a gastroenterologist, documented diarrhea frequency, and records of any medication changes protects you if VA schedules a future reexamination. Not every rating gets reexamined; understand when a rating becomes protected from future review (including Permanent and Total status) and what to do if VA proposes to reduce it. See Protect Your Rating and Future Reexaminations for the specifics.

If your Crohn's worsens after the initial grant, for example progressing to more frequent flares or requiring a biologic where you previously didn't, you can file for an increased rating. See the Rating Increase Guide.

Quick Reference Tables

Service Connection Pathways

Pathway	Mechanism	Evidence Needed
Direct	In-service GI symptoms or diagnosis, or continuity of symptoms after service	Service treatment records + nexus opinion or credible continuity testimony
Toxic exposure	Burn pits, PFAS/firefighting foam, Gulf War service, or similar documented exposure	Exposure record + medical opinion citing supporting research, not exposure alone
Secondary, mental health (DC 9434)	Gut-brain axis, stress-hormone and immune disruption	Nexus opinion tying Crohn's onset or worsening to PTSD, anxiety, or depression
Secondary, autoimmune overlap	Shared immune-mediated mechanism with another service-connected autoimmune condition	Nexus opinion addressing both causation and aggravation
Secondary, medication-induced	Long-term medication for a service-connected condition aggravates the GI tract	Nexus opinion naming the specific medication and mechanism

From Filing to Decision: Who Does What

Role	Does	Decides your rating?
VSO / accredited representative	Helps prepare, gather evidence, and file; represents you on appeal	No
VSR	Develops the claim: orders records and the C&P exam	No
C&P Examiner	Conducts the exam, completes the DBQ, may give a nexus opinion	No / but has a strong impact
Rater (RVSR)	Reviews the full file and decides service connection and percentage	Yes

Frequently Asked Questions

Is Crohn's disease a Gulf War presumptive?

No, not as a functional Gulf War illness. Crohn's is a structural, diagnosable autoimmune disease, so it does not ride the 38 CFR 3.317 functional-disorder presumptive that can cover IBS. It is service-connected directly, through a documented toxic exposure, or as secondary to another condition.

What is the highest VA rating for Crohn's disease?

100 percent is the maximum schedular rating under DC 7326, reserved for severe disease that is unresponsive to treatment, requires yearly hospitalization, and causes inability to work or the listed severe symptoms. Veterans whose Crohn's prevents steady work may also pursue a 100 percent rate through TDIU.

I was rated for Crohn's before 2024. Should I do anything?

The VA will not re-rate you automatically under the new DC 7326 criteria. If your Crohn's has worsened or is now controlled by a biologic or immunosuppressant, being considered under the 60 or 100 percent levels generally requires filing for an increased evaluation. A long-standing protected rating is not cut simply for asking, but read the rating-protection rules first.

Does being on a biologic raise my rating?

It can. The 60 percent level is written around moderate IBD managed on an outpatient basis with immunosuppressants or biologic agents, along with the listed pain, diarrhea, and toxicity signs. The medication is part of the criteria, so records naming it matter.

How is Crohn's different from ulcerative colitis for rating?

They use the same rating ladder, but different diagnostic codes: Crohn's is DC 7326 and ulcerative colitis is DC 7323. Crohn's can involve any part of the GI tract and the full bowel wall; ulcerative colitis is limited to the colon and rectum.

Does exposure to Camp Lejeune water automatically connect my Crohn's to service?

No. Crohn's disease is not on the Camp Lejeune presumptive list, so conceded exposure by itself does not establish service connection. You still need a medical opinion connecting the specific exposure to your Crohn's diagnosis.

Can I claim Crohn's as secondary to another condition?

Yes. Documented secondary pathways include mental health conditions like PTSD, anxiety, or depression through the gut-brain axis, other service-connected autoimmune conditions sharing an immune-mediated mechanism, and long-term medication taken for a service-connected condition that aggravates the GI tract. The nexus opinion should address both whether the other condition caused the Crohn's and whether it made it worse.

Disclaimer. This guide is written for educational purposes and describes how the VA's rules and regulations work in general. It is not legal advice, and it does not constitute representation or an attorney relationship. It is based in part on a small sample of published Board decisions that are not binding or precedential, so it shows patterns, not promises or predictions for any individual claim. Individual claims have unique facts, and outcomes depend on the specific evidence presented. Veterans seeking help with their claims should work with a VA-accredited VSO representative, claims agent, or attorney, and should not have to pay for basic help. The laws, regulations, and rating criteria referenced in this guide are current as of July 2026. Verify current rules at VA.gov or eCFR or through your VSO. Find an accredited representative →

Sources

38 CFR § 4.114, Digestive System, Diagnostic Code 7326 (current Crohn's/IBD rating), Diagnostic Code 7319 (older analogy rating, 30 percent maximum), and Diagnostic Code 7323 (ulcerative colitis, used by analogy)
Federal Register, Schedule for Rating Disabilities: The Digestive System (effective May 19, 2024)
VA News, VA updates the digestive-system rating schedule
38 U.S.C. §§ 1110 and 1131 (basic service connection for disability from service); 38 U.S.C. § 5107(b) (benefit of the doubt when evidence is in approximate balance); 38 U.S.C. § 1154(a) (VA must consider lay evidence)
38 CFR § 3.303, direct service connection, including § 3.303(d) for disease diagnosed after service, and § 3.303(b) on continuity of symptoms (Crohn's is not a listed chronic disease under 3.309(a))
38 CFR § 3.102, reasonable doubt resolved in the veteran's favor
38 CFR § 3.310, Secondary Service Connection, caused or aggravated by a service-connected disability
38 CFR § 3.307 and § 3.309, including § 3.309(f), the Camp Lejeune presumptive list, which does not include Crohn's
38 CFR § 3.317, Gulf War undiagnosed and functional gastrointestinal illness; Crohn's is a structural, not functional, disorder
38 CFR § 3.104(c), Board is bound by the VA's favorable findings; 38 CFR § 3.400 and § 3.155, effective dates and intent to file
38 CFR § 3.951(b), Protection of Ratings
Shedden v. Principi, 381 F.3d 1163 (Fed. Cir. 2004), the three elements of service connection
Combee v. Brown, 34 F.3d 1039 (Fed. Cir. 1994), direct causation remains available even for a condition that is not on a presumptive list
Layno v. Brown, 6 Vet. App. 465 (1994), competency of lay evidence describing personally observed symptoms
Jandreau v. Nicholson, 492 F.3d 1372 (Fed. Cir. 2007), competency of lay testimony regarding observable symptoms, and the limits of lay testimony on medical causation
Waters v. Shinseki, 601 F.3d 1274 (Fed. Cir. 2010), when the VA's duty to assist requires a medical examination
McLendon v. Nicholson, 20 Vet. App. 79 (2006), the low threshold for triggering a VA medical examination
El-Amin v. Shinseki, 26 Vet. App. 136 (2013), a secondary-connection medical opinion must address both causation and aggravation
Nieves-Rodriguez v. Peake, 22 Vet. App. 295 (2008), the probative value of a medical opinion comes from its reasoning, not just its conclusion
Jones v. Shinseki, 26 Vet. App. 56 (2012), the VA may not consider the ameliorative effects of medication where the rating criteria do not already contemplate it
Lynch v. McDonough, 21 F.4th 776 (Fed. Cir. 2021) (en banc), the benefit-of-the-doubt standard for evidence in approximate balance

Related Tools and Guides

DC 7326, Crohn's Disease / IBD

The per-code page with the full rating levels, C&P exam tips, and BVA grant data.

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The other inflammatory bowel disease, DC 7323, on the same rating ladder.

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How IBD differs from irritable bowel syndrome (DC 7319), and the Gulf War presumptive for IBS.

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PTSD Claims Guide

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DBQ Guide

The standardized exam form behind every C&P exam.

Nexus Letters

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Buddy & Lay Statements

How to document symptom continuity from service to diagnosis.

Service Connection Guide

The three-element test that underlies every VA disability claim.

PACT Act

Toxic-exposure categories and how they interact with non-presumptive conditions like Crohn's.

C&P Exam Prep

What to expect at the exam, including questions about medication and symptom frequency.

Inside Your Claim

Who handles your claim at each stage, from VSR to rater.

Reading Your Decision Letter

How to find the rating, the effective date, and the reasoning in your letter.

Letter Interpreter Tool

Upload your decision letter for a plain-English breakdown.

Appeals Guide

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Rating Increase Guide

Filing for the new 60 or 100 percent DC 7326 levels if you were rated before 2024.

Protect Your Rating

Permanent and Total status, reexaminations, and reduction defense.

Rating Protections Guide

Why an old protected rating isn't cut just for filing an increase.