How to Get an Independent Medical Review: Step-by-Step Guide

An independent medical review (IMR) — also called External Independent Review: Complete Guide" class="auto-link">external review — is your most powerful tool when your insurance company denies a claim and upholds the denial on internal appeal. It places your case in the hands of a physician who specializes in the relevant field of medicine, is independent of both you and the insurer, and whose decision is legally binding on the insurer.

The data overwhelmingly supports requesting external review. According to data compiled from state insurance departments across the country, independent medical reviews overturn insurance denials 40-60% of the time. In California, which has one of the most robust IMR programs, the Department of Managed Health Care reported overturn rates exceeding 60% in some years. For medical necessity denials specifically, overturn rates are even higher.

Despite these favorable odds, fewer than 1% of patients who receive a denial ever request external review. This guide ensures you know exactly how to get one.

Step 1: Understand What Independent Medical Review Is

An independent medical review is an evaluation of your denied claim by a physician or clinical expert who:

• Has no financial relationship with your insurance company
• Has no financial relationship with you or your providers
• Is board-certified in the relevant medical specialty
• Reviews your complete medical records, the insurer's denial rationale, and applicable clinical guidelines
• Issues a decision that is binding on the insurer (if the reviewer overturns the denial, the insurer must pay)

The legal basis for your right to external review:

• ACA Section 2719 (42 U.S.C. Section 300gg-19): All non-grandfathered health plans must provide access to external review
• 45 C.F.R. Section 147.136: Federal regulations implementing the external review requirement
• State external review laws: Many states have their own external review processes that may provide additional protections
• ERISA: For employer-sponsored plans, the federal external review process applies if the state process does not meet federal standards

Step 2: Confirm You Are Eligible

You can request an independent medical review for:

• Medical necessity denials: The insurer says the treatment is not medically necessary
• Experimental/investigational denials: The insurer says the treatment is experimental
• Rescission of coverage: The insurer retroactively cancelled your policy
• Any adverse benefit determination involving clinical judgment: If the denial involves a medical judgment, it qualifies for external review

You generally cannot request external review for:

• Eligibility disputes (whether you were enrolled or whether you met a waiting period)
• Contractual exclusions that do not involve clinical judgment (e.g., the plan simply does not cover a category of services)
• Claims that were denied solely for administrative reasons (wrong billing code, missing information) — though you should dispute these through the insurer's claims correction process

Prerequisite: Most states and the federal process require that you exhaust internal appeals first (at least one level of internal appeal). However, there are important exceptions:

• If the insurer fails to follow proper internal appeal procedures, you may be deemed to have exhausted the process
• For urgent/expedited cases, you can request external review simultaneously with the internal appeal
• Some states allow you to bypass internal appeal under certain circumstances

Step 3: Request the External Review

Deadline: You typically have 4 months (125 days in some states) from the date of the insurer's final internal appeal denial to request external review. Do not miss this deadline.

Where to file:

• State-regulated plans: File with your state insurance department or the state's designated external review entity. The insurer's final denial letter must include instructions.
• Self-funded employer plans: These are regulated under ERISA and use the federal external review process. File with the insurer, which is required to contract with an accredited IROs) Explained" class="auto-link">independent review organization (IRO).
• ACA marketplace plans: Use the federal external review process or your state's process.

How to file: Submit a written request for external review. Include:

[Your Name] [Address] [Date]

[State Insurance Department / Insurance Company External Review Department] [Address]

Re: Request for Independent Medical Review / External Review Insurer: [Insurance Company Name] Policy Number: [Number] Claim Number: [Number] Internal Appeal Reference: [Number/Date]

Dear [External Review Department]:

I am requesting an independent medical review / external review of my insurance company's denial of [treatment/service]. My internal appeal was denied on [date]. Under [ACA Section 2719 / 45 C.F.R. Section 147.136 / State Law Reference], I am entitled to have this denial reviewed by an independent physician.

Denial summary: My claim for [treatment] was denied on [date] because [denial reason]. I filed an internal appeal on [date], which was denied on [date]. The insurer's stated reason for upholding the denial is [reason].

Why I believe the denial should be overturned: [Brief summary of your clinical argument — 2-3 sentences].

I request that the independent reviewer consider all medical records, clinical guidelines, and evidence I have previously submitted in support of my claim, as well as the enclosed additional documentation.

Enclosed:

1. Copy of original denial letter
2. Copy of internal appeal denial letter
3. Copy of my appeal letter and all attachments
4. [Any additional medical records, guidelines, or evidence not previously submitted]

Sincerely, [Your Name]

Step 4: Prepare Your Documentation Package

The independent reviewer will typically receive:

• Your entire claim file from the insurer
• Your medical records
• The insurer's denial rationale and clinical criteria
• Any additional documentation you submit

To maximize your chances, submit:

Updated medical records: If your condition has changed or new test results are available since your internal appeal, include them.

Additional clinical evidence: Any peer-reviewed studies, clinical guidelines, or expert opinions that support your case. Focus on evidence that directly addresses the insurer's denial rationale.

A patient statement: A brief statement (1-2 pages) explaining your medical situation, what treatments you have tried, and why the denied treatment is necessary. Be factual and specific.

Your doctor's updated statement: Have your treating physician write a letter specifically addressed to the external reviewer, explaining the clinical necessity of the treatment and addressing the insurer's denial reasons point by point.

Step 5: Understand the Review Process

Who reviews your case: An IRO assigns your case to a physician or clinical expert who:

• Is board-certified in the relevant specialty
• Has no conflicts of interest with the insurer or you
• Practices in the relevant clinical area

What the reviewer evaluates:

• Your medical records and clinical history
• The insurer's denial rationale and the clinical criteria used
• Current medical literature and clinical guidelines
• Your treating physician's recommendations
• Any additional evidence you submitted

Timeline:

• Standard review: The IRO must issue a decision within 45 days of receiving the request
• Expedited review: Within 72 hours — available when delay would seriously jeopardize your health, ability to regain maximum function, or (for a pregnant woman) the health of the unborn child
• Concurrent care (ongoing treatment being terminated): Decision before the treatment reduction or termination takes effect

Cost: External review is free to you. The insurer pays the IRO's fees.

Step 6: Receive and Act on the Decision

If the reviewer overturns the denial:

• The insurer is legally bound to comply
• The insurer must authorize and pay for the treatment
• Follow up within 5-10 business days to ensure the insurer has processed the reversal
• If the insurer does not comply, file a complaint with your state insurance department immediately

If the reviewer upholds the denial:

• The external review decision is generally final, but you still have options:
  • File a complaint with your state insurance department if you believe the process was flawed
  • Request a new external review if you have significant new medical evidence not previously considered
  • For ERISA plans: You can file suit in federal court under 29 U.S.C. Section 1132(a)(1)(B). The external review decision will be part of the administrative record
  • Contact patient advocacy organizations for additional assistance
  • Consult with a health insurance attorney, especially for high-value claims

Step 7: Request Expedited Review When Time Is Critical

If you need treatment urgently, do not wait for The Standard timeline. Request expedited external review:

"I am requesting an expedited external review because delaying this treatment would seriously jeopardize my life, health, or ability to regain maximum function. My treating physician, Dr. [Name], has determined that [explain urgency]. Under 45 C.F.R. Section 147.136(d)(2)(i), I am entitled to an expedited review with a decision within 72 hours."

You can file for expedited external review simultaneously with an expedited internal appeal if the situation is urgent enough.

State-Specific External Review Programs

Some states have particularly strong IMR programs:

• California: The DMHC (Department of Managed Health Care) runs one of the most active IMR programs in the country, with historically high overturn rates
• New York: The Department of Financial Services administers external review with strong consumer protections
• Texas: The Texas Department of Insurance handles external review for state-regulated plans
• Illinois: External review is available through the Department of Insurance with specific protections for cancer treatments

Check your state insurance department's website for the specific external review process, forms, and contact information in your state.

Template Phrases for External Review Requests

• "Under ACA Section 2719 and 45 C.F.R. Section 147.136, I am entitled to an independent external review of this denial."
• "I request that the reviewing physician be board-certified in [relevant specialty] with experience treating [condition]."
• "The insurer's denial is inconsistent with current clinical guidelines from [organization] and the medical judgment of my treating physician."
• "I have exhausted the internal appeal process and am exercising my right to binding external review."

When to Use ClaimBack

A strong external review package can make the difference between a reversal and an upheld denial. ClaimBack helps you prepare a comprehensive appeal package that addresses the insurer's specific denial rationale with clinical evidence — Start Free.

Disclaimer: ClaimBack provides AI-generated appeal assistance for informational purposes only. ClaimBack is not a law firm and does not provide legal advice. External review processes vary by state — always verify current procedures with your state insurance department.

Denied on internal appeal? ClaimBack helps you prepare for independent review — Start Free

Related Reading

• Cost of Independent Medical Review: What Patients Actually Pay
• What Is Independent Medical Review (IMR)? A Deep Dive
• Independent Medical Examination (IME) Guide for Insurance Appeals
• What Is Independent Review Organization (IRO)? Insurance Term Explained
• How to File an External Review of Your Insurance Denial