After exhausting your internal appeals, or when your internal appeal is taking too long, you have the right to request an independent external review. This is a completely separate process from the insurer's internal review — an accredited organization with no connection to your insurance company evaluates your case and their decision is binding. External review overturns insurer denials in 40-60% of cases, making it one of the most powerful tools in your appeal arsenal.
What Is External Review?
External review (also called independent review or Independent Review Organization/IRO review) is a process established by ACA §2719 (45 CFR §147.136) that allows patients to have their insurance denial independently evaluated by a licensed, accredited third-party organization. The key features:
- The reviewer is completely independent from your insurance company
- The reviewer is accredited and must have appropriate clinical expertise
- The decision is binding on the insurer — they must comply
- It is typically free for you as the consumer
- Standard reviews must be completed within 45-60 days; urgent reviews within 72 hours
Who Is Eligible for External Review
External review is available for most non-grandfathered health insurance plans, including employer-sponsored plans and individual market plans, for:
- Medical necessity denials
- Experimental or investigational treatment denials
- Any denial that involves a medical judgment
- Rescissions (retroactive cancellations) of coverage
- Urgent/expedited denials
Self-funded ERISA plans are generally exempt from state external review laws but are subject to a federal external review process established by DOL regulations. Use our External Review Checker to determine your specific eligibility.
External Review Success Rates
CMS data and state reports show that external review overturns insurer denials in approximately: 40-50% of cases overall; 50-60% of cases for medical necessity denials; 45-55% of cases for experimental/investigational denials; 30-40% of cases for benefit exclusions. These are significantly better odds than many people expect.
When You Can Request External Review
Under ACA regulations, you can request external review in two situations:
- After internal appeal exhaustion: Once your internal appeal is denied, you have 60 days to request external review (some states have different deadlines).
- After deemed denial: If the insurer fails to comply with internal appeal timelines, the denial is "deemed" and you can proceed to external review without waiting for a decision.
How to File for External Review
The process varies slightly depending on your plan type:
For ACA Marketplace and Fully-Insured Plans
- Check your denial letter — it should include information about how to request external review
- File with the Independent Review Organization (IRO) designated by your insurer, or directly with your state insurance commissioner
- Submit within 60 days of receiving the final internal denial
- Include all clinical evidence you submitted during internal review, plus any new evidence
For Self-Funded ERISA Plans
- File a complaint with the U.S. DOL Employee Benefits Security Administration (EBSA) at 1-866-444-3272
- Request federal external review through the plan administrator
- Consider consulting an ERISA attorney for complex cases
What Happens During External Review
Once you request external review:
- The insurer must provide the IRO with all relevant claim information within 5 business days
- You can submit additional information to the IRO directly
- The IRO assigns a qualified reviewer with the relevant clinical expertise
- The reviewer applies generally accepted standards of medical practice — not the insurer's internal criteria
- The decision is issued within 45 days (standard) or 72 hours (urgent/expedited)
- If the IRO overturns the denial, the insurer must provide the benefit immediately
State-Specific External Review Programs
Many states have their own external review programs with additional consumer protections. States with particularly robust programs include California (DMHC handles HMO external reviews), New York (IRAP program through NYS Department of Financial Services), Texas (Texas DOI manages external review), and Massachusetts (strong state-level consumer protections). Check with your State Insurance Commissioner for state-specific requirements.
Filing Tips for External Review
- Submit a complete, organized package — IRO reviewers decide on the documents alone
- Include a cover letter summarizing the key clinical arguments
- Attach the most relevant peer-reviewed studies directly (don't just cite them)
- Get a physician letter specifically addressing why the insurer's criteria are too restrictive
- Check your state's external review deadline — 60 days is the federal minimum but some states have shorter windows