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Tysabri denials: what the review data shows

Independent reviewers have decided 13 published cases where an insurer denied Tysabri — and they overturned the insurer 92.3% of the time. A denial for Tysabri is a starting position, not a final answer.

Published decisions
13
2001–2026
Overturned
92.3%
12 denials reversed

Conditions behind tysabri denials

What insurers denied — and how those fights ended.
CategoryDecisionsOverturned
Multiple Sclerosis8
87.5%
Relapsing Remitting Multiple Sclerosis5
100%
Typical time to a decision
5 days
Most land between 4 and 9 days
Handled as urgent
76.9%
Expedited when a delay would cause harm
What the reviewers wrote
Excerpts from the independent reviewers’ published findings — the actual reasoning, quoted, not summarised.

Where the denial was overturned

Findings: The physician reviewer found that Nature of Statutory Criteria/Case Summary: A 32-year-old female patient with a diagnosis of multiple sclerosis has requested authorization and coverage for Tysabri. The records document that this patient presents with a history of multiple sclerosis. The patient’s provider has recommended treatment with natalizumab (Tysabri). As noted in the medical literature, multiple sclerosis is a chronic autoimmune and neurodegenerative disease of the central nervous system. The U.S. Food and Drug Administration (FDA) has approved Tysabri for the treatment of patients with multiple sclerosis. One study noted that the evidence for clinical benefits of early treatment with disease-modifying therapies suggests that early use of high-efficacy therapies in patients with multiple sclerosis is emerging.
Medical Necessity · 2024 · IMR MN24-42989
Findings: The physician reviewer found that The patient has requested authorization and coverage for Tysabri infusion administered at 300 mg every four weeks. Multiple sclerosis is an immune-mediated inflammatory demyelinating disease of the central nervous system that is associated with various disabilities. The patient’s provider has recommended treatment with Tysabri. The U.S. Food and Drug Administration (FDA) has approved Tysabri for the management of patients with multiple sclerosis. Tysabri is a disease-modifying therapy that reduces the relapse rate for patients with multiple sclerosis. Systematic review trials have shown Tysabri to significantly reduce relapse risk as well as progression risk. One study found that their 10-year interim analysis further supports the robust real-world effectiveness and well-established safety profile of Tysabri.
Medical Necessity · 2023 · IMR MN23-38910

Where the denial was upheld

Worth reading too — these show what an appeal has to overcome.
A 41-year-old female enrollee has requested Tysabri injections for treatment of her multiple sclerosis. Findings: The physician reviewer found that although the patient has a diagnosis of multiple sclerosis, the submitted records do not include confirmatory evidence to support the diagnosis. Based upon the information submitted, the patient is not currently assessed with a relapsing form of multiple sclerosis. The patient’s neurologist ordered several tests, the results of which have not been provided. Before it can be determined if a change in therapy is indicated, the diagnosis of multiple sclerosis must be confirmed, neuromyelitis optica should be ruled out and documentation of recent relapse should be provided. In the absence of such evidence, Tysabri is not medically necessary for treatment of the patient’s medical condition.
Medical Necessity · 2014 · IMR MN14-15987

Figures and quotations on this page come from 42,749 published decisions in the California DMHC Independent Medical Review dataset. These are California outcomes — every state runs an equivalent external review, but the rates here are California’s. Excerpts are quoted verbatim from the public record and describe this treatment generally, not any individual case.

How to use this in your appeal

These are outcomes from California’s external review program — an independent physician panel that binds the insurer. Every state has an equivalent process, and internal appeals succeed even more often. Cite the outcome record for Tysabriwhen you appeal: reviewers routinely find that denials like yours didn’t hold up.

SOURCE: CALIFORNIA DMHC INDEPENDENT MEDICAL REVIEW OUTCOMES (CHHS OPEN DATA) · DERIVED AGGREGATE STATISTICS ONLY · METHODOLOGY

Not legal or medical advice. Coverage Rights is a self-help tool that helps you prepare your own appeal. For advice about your specific situation, talk to a licensed attorney or your doctor.

Denied Tysabri? 92.3% got it reversed.

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