External Review by IRO: The Binding Second Opinion Most Patients Skip
After internal appeals are upheld, external review by an Independent Review Organization (IRO) is the binding second opinion. Free under federal law. 30-50% reversal rate. The federal process under 45 CFR §147.136(d), every state's variant, and when expedited 72-hour review applies.
External review is the second-opinion lane after internal appeals are upheld. An Independent Review Organization (IRO), a physician panel independent of the carrier, reviews and issues a decision binding on the carrier. Free to the patient under 45 CFR §147.136. Standard: 45 days (federal) / 30 days (most states). Expedited urgent: 72 hours. Reversal rates run 30-50%. Most patients never use external review because the carrier's 'internal appeal upheld' letter doesn't explain it well.
External review is available for adverse benefit determinations involving medical necessity, experimental/investigational treatment, rescission, and (in some states) comparability of services. NOT available for administrative/eligibility disputes, billing/coding errors, premium disputes, or claims that haven't completed internal appeals (with limited exceptions).
Three IRO tracks
Track A, State external review: for fully-insured plans, administered by state DOI or specialized agency (California DMHC). Track B, Federal external review for ERISA self-funded plans: under 29 CFR §2590.715-2719 and 45 CFR §147.136(d); HHS-OPM-accredited IROs randomly assigned. Track C, Medicare Advantage IRE (Maximus): Level 2 Independent Review Entity.
How the federal external review process works
Step 1, Preliminary review: within 5 business days of request, plan determines eligibility. Step 2, IRO assignment: plan assigns to accredited IROs on rotational basis (no shopping for friendly IROs). Step 3, Document submission: 10 business days to submit additional documentation. Step 4, IRO decision: 45 days standard / 72 hours expedited. Step 5, Decision is binding: carrier must comply if IRO reverses.
State external review variations
| State | Program name | Notable feature |
|---|---|---|
| California | Independent Medical Review (IMR) via DMHC | Free; binding; covers most fully-insured + Medi-Cal MC |
| Texas | IRO Review via TDI | Carrier must contract with IRO from TDI's list |
| New York | External Appeal via DFS | $50 filing fee (waived for hardship) |
| Florida | Subscriber Assistance Program via OIR | State-administered |
| Massachusetts | Office of Patient Protection (DOI) | Covers fully-insured + self-insured if employer opts in |
Building the external review packet
The IRO works from a written record (rarely conducts hearings). Required elements: external review request form, all denial letters and appeal correspondence, complete medical record, Letter of Medical Necessity (enormous weight at IRO, physician panels), professional society guidelines, peer-reviewed literature for EI disputes, case summary written to a physician audience.
The case summary lets the IRO physician get oriented fast, patient demographics in 2-3 sentences, service in dispute, carrier's rationale, clinical argument for reversal, relief requested, key exhibits.
Frequently asked questions
Is external review really free?
For federal external review under ACA-governed plans: yes. The carrier bears the IRO fee. For state programs: usually free; a few states (NY) charge a small fee waived for hardship.
How long do I have to file external review?
4 months (120 days) from the final internal adverse determination under federal rules. Some states differ, always check the final denial letter.
Is the IRO decision really binding?
Yes, on the carrier. The carrier must comply. Patient retains right to litigate further (ERISA or state law) but rarely does after IRO. The binding-on-carrier status is what makes external review the most powerful lever in the appeals system.
Who picks the IRO?
Plan/carrier does NOT pick. Federal law requires rotational/random assignment. State programs use IROs accredited and selected by state DOI. Independence safeguard.
What if the carrier won't process my external review request?
File complaint with state DOI (fully-insured) or DOL EBSA (ERISA), and directly contact federal external review administrator. Refusing to comply is itself a regulatory violation.
Can I appeal the IRO decision?
IRO decision binds the carrier and is the end of the administrative path. To challenge, file civil litigation (ERISA §502 for self-funded; state court for fully-insured). Courts give substantial weight to IRO decisions.
Sources
Got a denial of your own?
Two-minute intake. We confirm fit for guided support or self-guided package within one business day.
Start Your Appeal