What Is an External Review?
An external review is an independent review of your denied claim by a healthcare professional who did not participate in the original denial decision. External reviews provide an objective assessment of medical necessity and can overturn insurance company denials. Federal law and state regulations guarantee your right to external review for certain denials.
External reviewers are typically physicians in the same specialty as your treating provider. They evaluate the same clinical information and medical necessity criteria the insurance company used, but independently determine whether the denial was correct.
When You Have the Right to External Review
You have the right to external review when: your claim was denied as "not medically necessary," you have completed or attempted internal appeal without success, and your treatment is for a covered service. You do NOT have the right to external review for claims denied due to lack of coverage (uncovered service), eligibility issues, or administrative reasons.
External review is particularly valuable for denials involving clinical judgment about medical necessity.
How to Request External Review
Request external review from your insurance company or your state insurance department. Most insurers have external review forms and processes. Your request should include: your policy number, claim number, denial notice, explanation of why you believe the denial was wrong, and any new clinical information you want the external reviewer to consider.
Standard external review takes 30-45 days. Expedited review (for urgent denials) takes 72 hours. Request expedited review if delay risks serious harm to your health.
Preparing for External Review
Submit comprehensive clinical documentation supporting medical necessity. Include: complete medical records, imaging reports, specialist letters, clinical guidelines supporting the procedure, and any new clinical information not previously submitted. Make a compelling clinical argument for why the procedure is medically necessary.
The external reviewer bases the decision on clinical grounds, not on emotional appeals or hardship stories. Focus on clinical evidence.
External Review Success Rates
External review approval rates vary widely by procedure type and insurer, but research suggests that 40-60% of externally reviewed denials are overturned. The high overturn rate reflects that many denials were clinically questionable and independent review identifies them as inappropriate.