Long-Term Disability Claims for Thoracic Outlet Syndrome

Thoracic outlet syndrome is a painful and often debilitating condition that can severely limit the use of your arms, hands, and shoulders — making many jobs impossible to perform. If TOS has kept you out of work, you may be entitled to long-term disability (LTD) benefits, but winning those benefits requires understanding how insurers evaluate this condition and what makes these claims uniquely difficult to prove.

What Is Thoracic Outlet Syndrome and How Does It Affect the Body?

Thoracic outlet syndrome (TOS) is a general term used to describe conditions that occur in the thoracic outlet — the area formed by the top ribs and the collarbone — when a nerve or blood vessel is compressed by the rib, collarbone, or muscle. The compression can cause pain, abnormal sensations, swelling, and other symptoms in your upper body, including your neck, upper chest, shoulder, arm, or hand, typically on one side.

There are three distinct types:

• Neurogenic TOS happens when there is pressure on the brachial plexus — the network of intertwined nerves that travel across your upper chest — and represents about 95% of all cases.
• Venous TOS involves compression of the subclavian vein and represents about 4% of cases.
• Arterial TOS involves compression of the subclavian artery and is the rarest type, representing about 1% of all cases.

The type of TOS you have will affect how your claim is evaluated and what medical evidence insurers will expect to see.

Why Is Thoracic Outlet Syndrome Difficult to Diagnose?

TOS is notoriously hard to diagnose because its symptoms overlap significantly with other conditions, and no single definitive test exists to confirm it. Thoracic outlet syndrome is sometimes considered controversial, as symptoms can be vague and similar to other conditions — including carpal tunnel syndrome, cubital tunnel syndrome, cervical spine disease, and other types of nerve entrapment.

The physical exam is crucial to confirming the diagnosis and pinpointing the etiology. Improper posture can trigger symptoms, and symmetry and range of motion of both arms should be tested initially. Physicians typically use provocative tests — movements designed to reproduce symptoms — along with imaging studies including X-rays, MRI, CT scans, ultrasound, electromyography (EMG), and nerve conduction studies.

The controversy surrounding TOS is essentially due to the absence of objective criteria to confirm the diagnosis, particularly when there is no neurological weakness and a normal neurophysiological examination. This diagnostic ambiguity is precisely what insurers exploit when denying claims.

Does Thoracic Outlet Syndrome Qualify for Long-Term Disability Benefits?

TOS can qualify for LTD benefits if you can demonstrate that your symptoms prevent you from performing the material duties of your occupation. The diagnosis alone is not sufficient — you need evidence that your functional limitations are real, consistent, and severe enough to prevent sustained work activity.

Insurers focus heavily on objective findings because TOS is a condition where subjective pain complaints without corroborating test results are easy to challenge. The most disabling symptoms — arm pain, weakness, numbness, tingling, and fatigue with use of the upper extremities — directly affect the ability to type, lift, carry, reach overhead, and perform fine motor tasks.

Overhead activities are particularly difficult because they worsen both nerve and vascular compression as the rib, collarbone, and shoulder blade press together. For anyone whose job requires sustained computer use, repetitive arm movements, or overhead work, TOS can make continued employment impossible.

What Medical Evidence Do You Need to Support Your TOS Claim?

A strong LTD claim for thoracic outlet syndrome requires a well-documented record that goes beyond a diagnosis and connects your test results directly to your functional limitations. Because TOS is frequently challenged as subjective, the objective evidence in your file is especially important.

Your claim file should include:

• Imaging Studies: X-rays to check for a cervical or abnormal first rib, MRI of the cervical spine and brachial plexus, and CT or CT angiography where vascular involvement is suspected
• Duplex Ultrasound: Increasingly recommended as a first-line imaging tool in vascular TOS, especially when symptoms suggest venous or arterial compression
• Electrodiagnostic Studies: Nerve conduction velocity (NCV) and electromyography (EMG) to assess brachial plexus involvement; note that electroneuromyography only reveals abnormalities in severe cases, and conduction velocities are only decreased in the case of permanent nerve compression, so a normal EMG does not rule out TOS
• Provocative Test Documentation: Detailed records of which physical maneuvers reproduce your symptoms and under what conditions
• Functional Assessments: Written statements from your treating physician or physical therapist describing which specific job tasks you cannot perform and why
• Treatment Records: Physical therapy notes, injection history, any surgical records if decompression was performed, and documentation of your response to treatment

Why Do Insurers Deny Thoracic Outlet Syndrome Claims?

The primary reason TOS claims are denied is the lack of objective confirmatory testing. Because there is no single definitive diagnostic test, insurers routinely argue that the evidence is insufficient to establish the degree of impairment a claimant reports. Thoracic outlet syndrome is sometimes considered controversial, and symptoms can be vague and similar to other conditions — an argument insurers use aggressively to dispute both the diagnosis and the severity of functional limitations.

Other common denial reasons include:

• Normal Electrodiagnostic Results: Insurers use a normal EMG or nerve conduction study as evidence against the claim, even though these tests are frequently normal in TOS
• Inconsistency Arguments: If surveillance footage or social media shows you performing activities that appear to contradict your stated limitations, the insurer will use this to question your credibility
• Independent Medical Examination (IME) Conclusions: Insurers often retain physicians who conclude that your symptoms do not prevent sedentary or light work (sometimes without ever examining you)
• Failure to Pursue Treatment: If you have not consistently followed prescribed physical therapy or other recommended treatment, the insurer may argue you have not made a good-faith effort to recover
• The “Any Occupation” Definition: After 24 months on most LTD policies, the standard shifts from your own occupation to any occupation, significantly raising the bar for continued benefits

What Should You Do If Your TOS Claim Is Denied?

If your TOS long-term disability claim is denied, act quickly. Under ERISA — the federal law that governs most employer-sponsored disability plans — you typically have 180 days from the date of the denial letter to file an administrative appeal. Missing that deadline can permanently extinguish your right to benefits.

The appeal stage is your most important opportunity. You should gather updated records, obtain a detailed functional capacity assessment, and request a narrative letter from your treating physician that explicitly ties your objective findings to the specific tasks you cannot perform. Because TOS claims hinge on connecting subjective symptoms to objective evidence, the appeal record needs to be thorough and persuasive. If your plan is governed by ERISA, a federal court will generally be limited to reviewing only the administrative record — making it essential to build the strongest possible case before the appeal deadline passes.

How Can Ortiz Law Firm Help with Your TOS Disability Claim?

Ortiz Law Firm represents claimants nationwide in long-term disability disputes, including claims involving thoracic outlet syndrome and other complex musculoskeletal and neurovascular conditions. Attorney Nick Ortiz understands the medical and legal arguments insurers use to deny TOS claims and how to counter them effectively at both the appeal and litigation stages.

Whether you are filing an initial application, appealing a denial, or fighting a benefit termination, Ortiz Law Firm can help you build a complete and compelling claim. Call (888) 321-8131 for a free consultation.

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