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Nexus Letters for Hypothyroidism
Licensed Physician, MD | Patriot Path Medical Team
Specializing in VA endocrine evaluations and independent medical opinions • Last updated: June 2026
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Hypothyroidism means an underactive thyroid. It joined the Agent Orange presumptive list in 2021. For Vietnam-era veterans with qualifying exposure, that can make service connection simple. But the way the VA rates it surprises a lot of veterans. The thyroid rating itself is mostly a six-month starter. The lasting value comes from the residuals it leaves behind.
A nexus letter ties your thyroid condition to your service. It also helps document the residuals that carry the rating long term. Our physicians write it in the language the VA expects. One flat fee of $1,500, and the first consultation is free.
How VA Rates Hypothyroidism
The VA rates hypothyroidism under 38 C.F.R. § 4.119, Diagnostic Code 7903. The code is short. It has just two levels, and the rating is built to be temporary. Here is the rule, word for word. Then we cover what it really means for your claim.
"Hypothyroidism manifesting as myxedema (cold intolerance, muscular weakness, cardiovascular involvement (including, but not limited to hypotension, bradycardia, and pericardial effusion), and mental disturbance (including, but not limited to dementia, slowing of thought and depression)) ... 100. Hypothyroidism without myxedema ... 30."
| Rating | What it generally takes | Monthly pay (approx) |
|---|---|---|
| 100% | Hypothyroidism with myxedema: the severe form, with cold intolerance, muscle weakness, heart involvement, and mental changes. Continues for 6 months after a doctor says the crisis is stable, then rated on residuals. | ~$3,939/mo |
| 30% | Hypothyroidism without myxedema. This is the standard starting rating, and it continues for 6 months after diagnosis, then the rating shifts to the residuals.Most Common | ~$552/mo |
The surprise in this code is the clock. The 30% rating (or 100% for the severe form, myxedema) is a starting rating. The rule says it continues for six months. Then the VA rates the residuals. Those are the lasting effects of the thyroid problem, and each one is rated under its own body system. Ongoing fatigue and mental slowing can be rated under the mental-health rules. Weight and digestive effects fall under the digestive rules. Heart effects fall under the cardiovascular rules. Any eye involvement is rated separately under the eye rules. That is where the long-term rating actually comes from. The lesson: do not stop at the thyroid number. Document every residual, because after six months those residuals are the rating. Well-documented residuals can combine to total more than the 30% the thyroid code starts with.
Pay figures are approximate 2026 rates (effective December 1, 2025) for a single veteran with no dependents. Check VA.gov for current amounts.
How the hypothyroidism rating works over time
DC 7903 is one of the few codes built as a starter rating that converts to residuals. Here is the path, so you know what to document.
- 1
Diagnosis: 30% (or 100% for myxedema)
When hypothyroidism is diagnosed, the VA assigns 30%. If it shows up as myxedema, the severe form with heart and mental involvement, it is 100%.
- 2
A six-month clock runs
The 30% continues for six months after diagnosis. The 100% for myxedema continues for six months after a doctor says the crisis is stable.
- 3
The rating shifts to residuals
After six months, the VA rates the lasting effects, called residuals. Each one is rated under the body system it belongs to. Fatigue and mental slowing fall under mental health. Weight and digestive effects fall under digestive. Heart effects fall under cardiovascular. Eye involvement falls under the eye rules.
- 4
Residuals are where the rating lives
Each residual gets its own code, and the ratings combine. Several residuals can add up to more than the thyroid code's starting 30%. This is the step veterans miss most.
Do not let the claim end at the thyroid number. The six-month rule means your residuals are the rating after the first half-year. List every lasting effect (energy, mood, weight, heart, eyes). Get each one documented, so each can be rated under its own body system.
Estimate your hypothyroidism rating (DC 7903)
Hypothyroidism has just two levels, and the rating is built to convert to residuals after six months. Answer two questions to see where you likely stand. This is a rough orientation, not a rating decision.
Making a VA Disability Claim for Hypothyroidism
A VA disability claim for hypothyroidism needs three things to line up:
A current diagnosis
A hypothyroidism diagnosis backed by thyroid lab work (such as TSH and thyroid hormone levels) and your treatment record.
A service connection
Either hypothyroidism tied to service, the Agent Orange presumptive path, or a link to another service-connected condition or its treatment.
A medical nexus
A qualified opinion that your hypothyroidism is 'at least as likely as not' connected to your service, or to a service-connected cause.
For many Vietnam-era veterans, the presumptive path does the heavy lifting. Hypothyroidism joined the Agent Orange list in 2021. If you had qualifying herbicide exposure, the VA accepts the link, and you may not need a nexus letter for the thyroid condition itself. A nexus letter earns its keep where the presumption does not reach. That means hypothyroidism without qualifying exposure, or thyroid disease secondary to radiation or another service-connected cause. And on every hypothyroidism claim, the residuals are worth documenting. After six months, they are the rating. The 'at least as likely as not' standard (a 50% or better chance) comes from the benefit-of-the-doubt rule in 38 U.S.C. § 5107(b), carried out in 38 C.F.R. § 3.102.
How to Connect Hypothyroidism to Service
There are a few ways to tie hypothyroidism to your service. For many veterans the presumptive path is the strongest. Hypothyroidism is now on the Agent Orange list.
Presumptive (Agent Orange)
Hypothyroidism is an Agent Orange presumptive condition (38 C.F.R. § 3.309(e)), added in 2021. If you had qualifying herbicide exposure, the VA accepts the link to your service.
- Qualifying service. Service in Vietnam, the Korean DMZ, Thailand, and several other places and time periods can qualify. If it does, the VA presumes Agent Orange exposure.
- No nexus needed. On a presumptive claim you do not have to prove the cause. You still need a current diagnosis and proof of qualifying service.
Direct connection
Hypothyroidism began in service, or was first diagnosed while you served.
- A diagnosis in service. Being diagnosed with an underactive thyroid, or showing abnormal thyroid labs, while on active duty.
- Radiation exposure. The thyroid is sensitive to radiation. In-service radiation exposure can support a direct thyroid claim.
Secondary connection
Another service-connected condition, or its treatment, caused or worsened your hypothyroidism (38 C.F.R. § 3.310).
- Treatment for another condition. Some treatments can damage the thyroid. That includes certain radiation and some medications for service-connected conditions.
- Autoimmune links. Some service-connected conditions are tied to the autoimmune problems that cause an underactive thyroid.
Aggravation
You had a thyroid condition before service, and service made it permanently worse.
- Worse during service. Your thyroid condition progressed, or your treatment had to be stepped up, on active duty, beyond normal change over time.
Secondary Conditions
Hypothyroidism is felt across the body. After the first six months, the VA rates those effects as residuals under their own systems. Each one the VA can rate is rated on its own and added to your combined rating.
Hypothyroidism may be secondary to
- Radiation exposure. The thyroid is sensitive to radiation. Service-connected radiation exposure can support a thyroid claim.
- Treatment for another condition. Certain medications and treatments for service-connected conditions can damage the thyroid. That can bring on hypothyroidism.
Residuals that may be rated on top of hypothyroidism
- Depression and mental slowing. An underactive thyroid can cause low mood, fatigue, and slowed thinking. After six months, these are rated under the mental-health rules.
- Weight gain and digestive effects. Thyroid problems can affect weight and digestion, rated under the digestive rules.
- Heart effects. Hypothyroidism can slow the heart and affect blood pressure. These effects are rated under the cardiovascular rules.
- Eye involvement. Thyroid eye disease (such as bulging eyes or double vision) is rated separately under the eye rules.
What to Gather - Evidence Checklist
Gather these before you file or ask for a letter. For hypothyroidism, your thyroid labs establish the diagnosis. Your residual records carry the long-term rating.
Frequently Asked Questions
How does the VA rate hypothyroidism?
Under 38 C.F.R. 4.119, Diagnostic Code 7903. There are two levels. 30% is for hypothyroidism without myxedema. 100% is for hypothyroidism with myxedema, the severe form with cold intolerance, muscle weakness, heart involvement, and mental changes. The rating is time-limited. It continues for six months. Then the VA rates the residuals under the body system each one belongs to.
Is hypothyroidism presumptive for Agent Orange?
Yes. Hypothyroidism was added to the Agent Orange presumptive list in 2021 (38 C.F.R. 3.309(e)). If you had qualifying herbicide exposure, the VA accepts that your hypothyroidism is connected to your service. You do not have to prove the cause. You still need a current diagnosis and proof of qualifying service.
Why did my hypothyroidism rating change after six months?
Because the code is built that way. DC 7903 assigns 30% (or 100% for myxedema) for six months. Then it converts the rating to the residuals: the lasting effects of the thyroid problem, each rated under its own body system. Fatigue and mental slowing fall under mental health. Weight and digestion fall under digestive. Heart effects fall under cardiovascular. Eye involvement falls under the eye rules. Documenting every residual is how you protect the rating.
Can I get more than 30% for hypothyroidism?
Yes, in two ways. The severe form, myxedema, is rated 100%. And after the first six months, the rating is based on the residuals. Each one is rated under its own code, and they combine. Several well-documented residuals (mood, fatigue, weight, heart, eyes) can add up to more than the 30% the thyroid code starts with. That is why the residuals matter so much.
Do I need a nexus letter for hypothyroidism?
If your hypothyroidism is presumptive through Agent Orange, you may not need one for the thyroid condition itself. A nexus letter earns its keep where the presumption does not reach. That means hypothyroidism without qualifying exposure, or thyroid disease secondary to radiation or another service-connected cause. And documenting the residuals helps on every claim. That medical opinion is what we write.
Hypothyroidism is presumptive. The residuals are where the rating lives.
Our physicians can connect your hypothyroidism to your service. They can also help document the residuals, so your rating reflects everything you live with.
Sources & Regulatory References
- VA disability compensation (VA.gov) https://www.va.gov/disability/
- 2026 VA disability compensation rates (VA.gov) https://www.va.gov/disability/compensation-rates/veteran-rates/
- 38 CFR 4.119, Schedule of ratings, endocrine system, including DC 7903 (eCFR) https://www.ecfr.gov/current/title-38/section-4.119
- Agent Orange exposure and disability compensation (VA.gov) https://www.va.gov/disability/eligibility/hazardous-materials-exposure/agent-orange/
- 38 CFR 3.309, Disease subject to presumptive service connection (eCFR) https://www.ecfr.gov/current/title-38/section-3.309
- 38 CFR 3.310, Secondary service connection (eCFR) https://www.ecfr.gov/current/title-38/section-3.310
- 38 U.S.C. 5107, Benefit of the doubt (Cornell LII) https://www.law.cornell.edu/uscode/text/38/5107