Thanks to the VA recognizing Parkinson’s disease and Parkinsonism as presumptive conditions associated with Agent Orange, both the herbicide exposure and its link to the disability are presumed for Vietnam War veterans with qualifying military service. But Parkinson’s has long been disputed in Agent Orange-related VA claims, either because of contested herbicide exposure or due to diagnostic classification (such as when Parkinsonism is labeled as essential tremor or another condition).
The Agent Orange VA Presumption for Parkinson’s
Parkinson’s disease was deemed a presumptive Agent Orange condition from August 31, 2010, meaning the VA presumes that Parkinson’s is related to herbicide exposure if the veteran served in a covered location and timeframe.
In most cases, the presumption removes the need for a separate medical nexus opinion linking Parkinson’s disease to Agent Orange. Instead, the claim is generally decided based on whether the veteran meets the service requirements and has medical evidence confirming a current diagnosis.
The Agent Orange presumption does not guarantee claim approval or a high disability rating. The VA must verify qualifying service, confirm the diagnosis, and evaluate the severity of the disease and any related residuals before assigning disability compensation.
Does the VA Also Cover Parkinsonism as an Agent Orange Presumptive?
Parkinsonism is a broad term that describes a group of neurological disorders that produce symptoms like Parkinson’s disease (including tremors, slowed movement, muscle stiffness, and balance problems). Parkinsonism was added as a presumptive condition associated with Agent Orange exposure when Congress expanded presumptive eligibility in 38 U.S.C. § 1116(a)(2), effective January 1, 2021.
As a result, veterans with qualifying herbicide exposure and a diagnosis of Parkinsonism may qualify for presumptive service connection without having to provide a medical opinion linking the condition to Agent Orange.
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The Medical Link Between Agent Orange and Parkinson’s Disease
The scientific evidence supporting the VA’s decision to recognize Parkinson’s disease and Parkinson’s-like symptoms as an Agent Orange presumptive condition comes from the National Academies of Sciences, Engineering, and Medicine (NASEM). The NASEM found evidence linking Parkinson’s disease and related movement disorders to herbicides and TCDD (2,3,7,8-tetrachlorodibenzo-p-dioxin), the highly toxic chemical contaminant in Agent Orange.
In the NASEM, Veterans and Agent Orange: Update 11 (2018) report, Parkinson’s disease and Parkinson-like conditions (including multiple system atrophy (MSA), progressive supranuclear palsy (PSP), and Parkinsonism) were found to have “limited or suggestive evidence of an association” with herbicide and TCDD exposure.
Veterans Exposed to Agent Orange Are More Affected by Parkinson’s
In 2016, Yang, Cheon and Kwak (Dementia and Neurocognitive Disorders) reported that Parkinson’s disease may affect veterans exposed to Agent Orange differently than people who develop the disease without a known cause. Researchers compared 143 veterans exposed to Agent Orange with 500 people who were not exposed. The exposed veterans had more severe tremors, greater muscle stiffness, and lower dopamine-transporter uptake on specialized PET imaging. The findings suggested that Agent Orange exposure may change how Parkinson’s disease develops and progresses.
A 2023 study (Song et al. 2023, Age and Ageing) reviewed 12 years of medical records covering 37,246 veterans treated at the Veterans Health Service Medical Center in Seoul, South Korea. Between 2010 and 2020, Parkinson’s disease incidence was 6.33% among veterans with both Agent Orange exposure and a history of taking medications associated with drug-induced Parkinsonism, 1.63% among veterans with Agent Orange exposure alone, and 1.30% among veterans with neither risk.
After adjusting for age and other health conditions, the combined exposure to Agent Orange and medications was associated with 68% higher odds of Parkinson’s disease than the group with neither factor.
Proving Agent Orange Exposure by Service Location
Veterans who served in certain locations during specific time periods may qualify for presumed Agent Orange exposure. When the VA presumes exposure, veterans do not have to provide separate evidence showing they came into contact with herbicides. Qualifying regions include:
- Vietnam (including offshore waters): Veterans who served in the Republic of Vietnam between January 9, 1962, and May 7, 1975, qualify for presumed Agent Orange exposure under 38 C.F.R. § 3.307(a)(6).
- Blue Water Navy: Veterans who served aboard ships in the offshore waters of Vietnam (no more than 12 nautical miles from the demarcation line) qualify for Parkinson’s disease and Parkinsonism presumption under the Blue Water Navy Vietnam Veterans Act, which took effect on January 1, 2020.
- Korean Demilitarized Zone (DMZ): Veterans who served in a unit operating in or near the Korean DMZ between September 1, 1967 and August 31, 1971, are presumed to have been exposed to Agent Orange under 38 C.F.R. § 3.307(a)(6)(iv).
- Thailand: Veterans who served at any U.S. or Royal Thai military base between January 9, 1962, and June 30, 1976, may qualify for presumed Agent Orange exposure. The VA no longer requires proof of a specific military occupation or perimeter duty.
What if a veteran does not meet the requirements for a presumptive location or date?
The claim can still be won through direct service connection under 38 C.F.R. § 3.303 and Combee v. Brown, 34 F.3d 1039 (Fed. Cir. 1994), with a competent nexus opinion linking Parkinson’s to documented in-service herbicide exposure.
How to File a VA Claim for Parkinson’s as an Agent Orange Presumptive
- Get a current diagnosis from a neurologist (a doctor specializing in disorders of the brain and nervous system), or another qualified medical provider. Medical records should clearly identify Parkinson’s disease or the specific type of Parkinsonism that has been diagnosed.
- Gather and submit military records that verify eligible service. Helpful documents include DD-214, unit records, deployment records, or other military records that verify when and where the veteran served.
- Submit VA Form 21-526EZ to apply for disability compensation. Veterans can file online, by mail, or with the help of an accredited representative. The application should identify Parkinson’s disease or Parkinsonism as an Agent Orange presumptive condition.
- Attend the Compensation and Pension examination (a medical evaluation the VA uses to confirm the diagnosis and determine how the condition affects daily activities and the ability to work) if the VA schedules one.
Why Do Agent Orange Parkinson’s Claims Get Denied?
Many Agent Orange Parkinson’s claim denials stem from a handful of recurring issues. Understanding why claims are denied and knowing how to address those problems can improve the chances of a successful outcome.
| Common Reason for Denial | How to Strengthen the Claim |
|---|---|
| The Department of Defense has not confirmed tactical herbicide use in the duty location, which is not recognized as a qualifying Agent Orange exposure site (such as Panama or Puerto Rico). | Pursue direct service connection with evidence that tactical herbicides or a relevant herbicide agent were actually present and that the veteran was exposed. This may include official records, unit histories, storage or testing records, photographs, and detailed firsthand or buddy statements. A medical nexus opinion is also needed to connect Parkinson’s to the established exposure. |
| A Thailand claim was denied under the VA’s former perimeter duty requirement. | The PACT Act expanded the Thailand Agent Orange presumption. Veterans who served at any U.S. or Royal Thai military base between January 9, 1962, and June 30, 1976, are now presumed exposed regardless of military occupation or perimeter duties. |
| The diagnosis is an atypical Parkinson’s disorder, such as multiple system atrophy (MSA), dementia with Lewy bodies, progressive supranuclear palsy (PSP), corticobasal degeneration, or vascular Parkinsonism. | Determine whether the medical records diagnose Parkinsonism or identify Parkinsonian manifestations. Submit a neurologist’s opinion clarifying the diagnosis and explaining whether the condition falls within the medical meaning of Parkinsonism. If the diagnosis is deemed by VA to be outside the presumption, direct service connection can still be pursued with competent medical evidence. |
| The VA incorrectly stated that Parkinson’s disease must appear within one year of Agent Orange exposure. | Parkinson’s disease and Parkinsonism are not subject to the one-year manifestation requirement. Under 38 C.F.R. § 3.307(a)(6)(ii), that rule applies only to chloracne, porphyria cutanea tarda, and early-onset peripheral neuropathy. Parkinson’s disease may be service connected many years after military service. |
How Is Parkinson’s Evaluated and Compensated?
The VA assigns a minimum 30 percent disability rating for Parkinson’s disease under Diagnostic Code 8004 when there are ascertainable residuals. Because Parkinson’s often affects multiple body systems, combined disability ratings often exceed the 30 percent minimum. Depending on the number and severity of separately ratable residuals, the combined evaluation can be substantially higher than the 30% minimum and, in severe cases, reach 100%.
As Parkinson’s disease progresses, new symptoms may develop, or existing ones may become more severe. Veterans can request an increased disability rating if the medical evidence shows the condition has worsened.
The VA evaluates many of the lasting effects of Parkinson’s disease separately when they cause their own disability. Common examples include tremors and impaired movement, difficulty swallowing, speech problems, loss of balance and falls, depression or other mental disorders, urinary problems, sleep disturbance, cognitive impairment or dementia. Those individual ratings are then combined to determine the veteran’s overall disability rating.
If Parkinson’s and its residuals prevent a veteran from maintaining substantially gainful employment, the VA may award Total Disability based on Individual Unemployability (TDIU), which pays compensation at the 100 percent disability rate. The VA looks to the veteran’s inability to work as to how much you should be disabled or how much of a rating he should get. A veteran who cannot work at all should be 100% rated or rated under unemployability.
VA Attorney Tips
When someone gets a rating for just Parkinson’s, they’re not getting rated for most of the problems that they have. We have seen veterans who had just a 30% rating for Parkinson’s yet were on Social Security disability for that. The other thing to look for is even if you are 100% service connected to Parkinson’s, unfortunately the disability is so devastating that you can be entitled to a special monthly compensation.
When you hear that there is nothing beyond 100%, you need to know that’s not right. Especially in cases that are so devastating like Parkinson’s, people may need aid and attendance; they may need people to help them. They may be housebound or they can’t go out. All of these things may qualify you for additional monetary benefits.
Content Reviewed by
Brenda Duplantis
Brenda Duplantis is a Accredited Claims Agent with a solid background in Social Security Disability Law and Veterans Law. She has been helping clients at Hill & Ponton with disability claims since 1991. Brenda is a member of the National Organization of Veterans’ Advocates.
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