You can file for VA disability for diabetes secondary to PTSD under 38 C.F.R. § 3.310, which lets the VA compensate a veteran when a service-connected condition causes or worsens a separate disease. To win, you need three things: a current Type 2 diabetes diagnosis, an existing service-connected PTSD rating, and a medical opinion tying the diabetes to the PTSD. The link is usually built through weight gain driven by PTSD symptoms, side effects of psychiatric medication, or the biological stress response itself.1eCFR. Disabilities That Are Proximately Due to, or Aggravated by, Service-Connected Disease or Injury
How Secondary Service Connection Works
Secondary service connection under § 3.310 covers two situations. The first is direct causation: the evidence shows diabetes was “proximately due to or the result of” the service-connected PTSD. The second is aggravation, from Allen v. Brown, 7 Vet. App. 439 (1995), which requires the VA to compensate a veteran when a service-connected condition worsens a nonservice-connected disease beyond its natural progression.2Federal Register. Claims Based on Aggravation of a Nonservice-Connected Disability Aggravation claims require a baseline severity of the diabetes before PTSD made it worse, and the VA only compensates for the increase above that baseline.
The Federal Circuit made the causation standard more favorable in 2023. In Spicer v. McDonough, 61 F.4th 1360 (Fed. Cir. 2023), the court held that the statutory phrase “resulting from” in 38 U.S.C. § 1110 requires only standard “but-for” causation, not a stricter direct etiological link.3U.S. Court of Appeals for the Federal Circuit. Spicer v. McDonough, No. 2022-1239 Secondary service connection is warranted whenever the nonservice-connected disability would have been less severe but for the service-connected condition, and the court expressly recognized multi-link causal chains.
Why PTSD Is Medically Linked to Type 2 Diabetes
The connection is well documented. A 2016 meta-analysis in Psychosomatic Medicine, covering nearly 149,000 individuals across five studies, found people with PTSD had a relative risk of 1.49 for developing Type 2 diabetes.4King’s College London. Type 2 Diabetes Among People With Posttraumatic Stress Disorder: Systematic Review and Meta-Analysis War veterans in that analysis showed a diabetes prevalence of 16.3%. A 2025 systematic review in Cureus synthesizing 13 studies reported a 30% to 50% increased incidence of Type 2 diabetes in people with PTSD.5National Library of Medicine. PTSD and Type 2 Diabetes: Systematic Review
The pathways are both biological and behavioral. Chronic PTSD activates the hypothalamic-pituitary-adrenal axis, raising glucocorticoid levels that interfere with glucose transport and promote insulin resistance, abdominal obesity, and hyperglycemia.6National Library of Medicine. PTSD, Metabolic Syndrome, and the Role of Glucocorticoid Dysregulation PTSD also produces chronic low-grade inflammation with elevated pro-inflammatory cytokines like interleukin-6 and tumor necrosis factor-alpha, both tied to insulin resistance and pancreatic dysfunction.7Frontiers in Endocrinology. Mendelian Randomization Study of PTSD and Type 2 Diabetes A 2017 study of 160 Iraq and Afghanistan veterans found that 21.3% of those with PTSD met criteria for metabolic syndrome, compared to 2.5% of combat-exposed veterans without PTSD.8ScienceDirect. Biological Predictors of Insulin Resistance Associated With PTSD in Young Military Veterans
Behaviorally, PTSD symptoms such as depression, isolation, sleep impairment, and loss of motivation drive sedentary habits, poor eating, and weight gain. A 2024 JAMA Network Open study of more than 10,000 veterans with both conditions found that younger veterans whose PTSD symptoms improved had lower risks of insulin initiation and all-cause mortality.9JAMA Network Open. Posttraumatic Stress Disorder and Type 2 Diabetes Outcomes in Veterans
Obesity as an Intermediate Step
Obesity by itself is not a disability under VA rules, but VA General Counsel opinion VAOPGCPREC 1-2017 established that obesity can serve as an intermediate step between a service-connected condition and a current disability.10VA Office of General Counsel. VAOPGCPREC 1-2017 The Veterans Court reinforced this in Walsh v. Wilkie, 32 Vet. App. 300 (2020).11Board of Veterans’ Appeals. BVA Decision, Citation Nr. 24002571 For diabetes claims, the chain reads: PTSD caused weight gain, and that weight gain caused or aggravated the diabetes. The Board has granted claims on exactly this theory when a private medical opinion explains each link.12Board of Veterans’ Appeals. BVA Decision, Citation Nr. A25018432
Psychiatric Medications
Antipsychotic and mood-stabilizing drugs prescribed for PTSD, including Quetiapine (Seroquel) and Aripiprazole, are documented to cause weight gain, hyperglycemia, and elevated serum glucose. In a January 2023 Board decision, the VA granted secondary service connection after a treating physician attributed the veteran’s diabetes to weight gain from Quetiapine and Aripiprazole, noting no family history of diabetes and the known metabolic risks of both drugs.13Board of Veterans’ Appeals. BVA Decision, Citation Nr. 23002016 The medication pathway can carry a claim on its own or complement the behavioral theory.
Building the Evidence
Most of these claims fail on the nexus. A vague statement that diabetes “may be” related to PTSD carries little weight, and the Board consistently rejects conclusory opinions that ignore the veteran’s history.14Board of Veterans’ Appeals. BVA Decision, Citation Nr. A25005350 A strong nexus letter does four things:
- States the correct legal standard, that it is “at least as likely as not” (50% or greater probability) that the diabetes was caused or aggravated by PTSD.
- Traces the veteran’s specific history: weight gain from service to the present, changes in diet and activity, medication history, and the timeline of both diagnoses.
- Cites peer-reviewed medical literature linking PTSD to obesity and obesity to diabetes. Board decisions have faulted VA examiners for ignoring this literature.
- Walks through a clear causal chain, whether behavioral, biological, medication-based, or a combination.
The most persuasive opinions come from psychiatrists, endocrinologists, or internal medicine doctors experienced in metabolic disease, and the physician should review the full claims file, service records, and VA treatment records first. The physician’s CV should accompany the letter. Private nexus letters from specialists can cost upward of $1,500, though some veterans’ disability attorneys work on contingency and cover the cost.
The C&P Examination
After you file, the VA usually schedules a Compensation and Pension exam. The examiner uses a Disability Benefits Questionnaire that asks about your treatment regimen (diet, oral medication, or insulin), whether you must regulate physical activity to avoid hypoglycemic episodes, hospitalizations for ketoacidosis or hypoglycemia, and complications such as neuropathy, nephropathy, or retinopathy.15VA. Disability Benefits Questionnaire – Diabetes Mellitus Be ready to describe how PTSD symptoms shaped your eating, exercise, sleep, and weight, and bring documentation of weight trends and a list of psychiatric medications with their known side effects. If the C&P opinion goes against you, a strong private nexus letter can serve as rebuttal.
How Diabetes Is Rated
Diabetes mellitus is rated under Diagnostic Code 7913 from 10% to 100% based on the level of medical intervention required:16Cornell Law Institute. 38 CFR § 4.119 – Schedule of Ratings, Endocrine System
- 10%: Manageable by restricted diet alone.
- 20%: Requires insulin and restricted diet, or an oral hypoglycemic agent and restricted diet.
- 40%: Requires insulin, restricted diet, and regulation of activities (medical restriction of strenuous work or recreation to avoid hypoglycemic episodes).
- 60%: Requires insulin, restricted diet, and regulated activities, plus one or two hospitalizations per year for ketoacidosis or hypoglycemic reactions, along with complications that would not individually qualify for a separate rating.
- 100%: Requires more than one daily insulin injection, restricted diet, regulated activities, at least three hospitalizations per year or weekly diabetic care visits, plus progressive weight loss and loss of strength or separately compensable complications.
Compensable complications like peripheral neuropathy, diabetic retinopathy, nephropathy, erectile dysfunction, and cardiovascular conditions such as hypertension are rated separately under their own diagnostic codes and combined with the diabetes and PTSD ratings using the VA’s combined ratings table.17VA. About VA Disability Ratings The VA does not add percentages; it applies each successive rating to the remaining “whole person” percentage and rounds the final result to the nearest 10%.
Watch the anti-pyramiding rule at 38 C.F.R. § 4.14. The VA cannot compensate the same symptom under two different diagnostic codes.18eCFR. 38 CFR § 4.14 – Avoidance of Pyramiding If fatigue or sleep impairment could be attributed to either PTSD or diabetes, it goes under only one code, and under governing regulations it should be assigned to whichever code produces the higher combined rating.
Filing and Appealing
File the secondary claim using VA Form 21-526EZ, available through the VA’s disability compensation portal, by mail, or in person at a regional office.19VA. How to File a VA Disability Claim There is no deadline for filing a secondary claim once the primary condition is service-connected. Submitting all supporting evidence with the initial application qualifies the filing as a “fully developed claim” and speeds processing. As of early 2026, the VA reports an average processing time of roughly 77 days.
If the claim is denied, you have three options under the Appeals Modernization Act, all with a one-year deadline from the denial letter. A Supplemental Claim (VA Form 20-0995) is the right route when the denial rested on insufficient evidence, because you can submit new and relevant evidence such as a private nexus letter, and the VA has a duty to assist. A Higher-Level Review (VA Form 20-0996) suits a case where the original decision contained a clear factual or legal error, but no new evidence is allowed. A Board Appeal sends the case to a Veterans Law Judge for de novo review.20VA. Request a Higher-Level Review
Presumptive Connection Is a Separate Route
If you were exposed to Agent Orange or other tactical herbicides in Vietnam, Thailand, the Korean DMZ, or certain other locations during qualifying periods, Type 2 diabetes is a presumptive condition and you do not have to prove causation.21VA. Is My Type 2 Diabetes a Presumptive Condition The PACT Act of 2022 expanded presumptions related to burn pit and toxic exposure but did not add new diabetes presumptions beyond the existing Agent Orange framework.22VA. The PACT Act and Your VA Benefits The two theories are not mutually exclusive, so if you qualify under both, you can file under both.