The right that nobody uses
Section 2719 of the Public Health Service Act, codified at 42 USC § 300gg-19 and implemented by 45 CFR § 147.136, requires every non-grandfathered health plan - individual, small group, large group, fully insured, and self-funded ERISA - to offer an external review of any adverse benefit determination that involves medical judgment or a coverage rescission. The review is conducted by a state-licensed Independent Review Organization (IRO) selected through random assignment, paid for by the plan, and binding on both sides. It is the most consumer-friendly piece of insurance regulation passed in the last 25 years, and the federal General Accounting Office repeatedly finds that fewer than 1% of denied claimants ever invoke it.
That underuse is partly a marketing problem. Plans bury the external-review notice on page four of denial letters in eight-point type. It is also a confusion problem: there are two external-review tracks (state-administered and federal HHS- administered) and the rules differ slightly. This guide explains when each applies, how to file, what to send, and how to maximize the IRO's chance of reversing the denial.
Eligibility: which denials get external review?
Under 45 CFR § 147.136(d)(1)(ii), external review is available for any adverse benefit determination that involves:
- Medical judgment - including medical necessity, appropriateness, healthcare setting, level of care, or effectiveness of a covered benefit; and
- Rescission of coverage - cancellation of coverage with retroactive effect, regardless of fault.
Pure contractual exclusions are generally not eligible - for example, a plan that explicitly excludes "all dental prosthetics" can deny dentures on contract grounds with no medical judgment in play. But the line is fuzzy. A plan that denies a cochlear implant as "experimental" is making a medical judgment and the denial is reviewable, even if the plan tries to characterize it as a contract exclusion.
State process vs. federal HHS process
Two tracks exist:
State-administered external review
Used when the state has either (a) a process that meets all 16 minimum standards in the NAIC Uniform Health Carrier External Review Model Act or (b) an HHS-approved "alternate" state process. Applies to fully insured policies issued in that state. Most states - California, New York, Texas, Florida, Illinois, and roughly 40 others - operate compliant processes. Filing details live with the state insurance department.
Federal HHS-administered process
Used by self-funded ERISA plans (because ERISA preempts state external-review law for self-funded plans), by plans in states without a compliant process, and by plans that elect the federal process. Run by HHS through three accredited IROs (MAXIMUS, Medical Review Institute of America, and IPRO at the time of writing - check the current list at externalappeal.cms.gov). Filing is via the HHS-managed external review portal or by mail.
Your denial letter is required by 45 CFR § 147.136(b)(2)(ii)(E)(3) and 29 CFR § 2560.503-1(g)(1)(vii) to tell you which process applies and how to file. If it doesn't, the omission is itself a procedural defect.
Step 1: Exhaust internal appeals (or get to deemed exhaustion)
External review is generally available only after the plan's internal appeal process is complete, with two exceptions:
- Expedited external review can be requested concurrently with an expedited internal appeal under 45 CFR § 147.136(d)(1)(ii)(B) when the standard timeframe would seriously jeopardize life or health.
- Deemed exhaustion applies when the plan fails to comply with claims procedures. 29 CFR § 2560.503-1(l)(2) and 45 CFR § 147.136(b)(2)(ii)(F) treat administrative remedies as exhausted, and the claimant can proceed directly to external review.
Step 2: File within four months
Under 45 CFR § 147.136(d)(2)(i), you have at least four months from receipt of the final adverse benefit determination to file the external review request. State processes may give longer. Calendar the deadline. File by certified mail, fax, and online portal where available.
Step 3: Submit a complete record
The IRO will request the entire claim file from the plan. You should also submit, directly to the IRO:
- A cover letter framing the medical-judgment question.
- The plan's denial letter and final internal appeal determination.
- The plan's published medical-coverage policy for the service.
- Treating physician's letter of medical necessity addressed to the IRO. See our medical necessity letter guide.
- All clinical records: office notes, imaging, lab results, hospital records, prior treatment history.
- Peer-reviewed clinical literature (cite PubMed IDs).
- Specialty-society guidelines: NCCN for oncology, AHA/ACC for cardiology, AAN for neurology, ASCO, ACOG, APA, AAP.
- Statements from the patient and family about quality-of-life impact, functional status, and prior treatment failures.
Step 4: Use the same-specialty argument
Under 45 CFR § 147.136(e)(2), accredited IROs must assign each review to a clinical reviewer with appropriate expertise. If your case turns on rheumatology, demand a rheumatologist - not a general internist. If the IRO's draft decision was made by a non-specialist, that is grounds for reconsideration.
Step 5: Expedited external review (the 72-hour track)
45 CFR § 147.136(d)(2)(v) requires the IRO to issue an expedited decision as expeditiously as the medical condition requires and no later than 72 hours after receipt. To trigger this track, the request must be accompanied by a physician statement that delay would seriously jeopardize life, health, or the ability to regain maximum function. See our ACA expedited appeal guide for the physician attestation template.
Step 6: After the IRO decision
If the IRO reverses the denial, the plan must provide coverage immediately and pay any covered benefit. If the IRO upholds the denial, the federal regulatory process is at an end. For ERISA plans, the next step is suit in federal court under 29 USC § 1132(a)(1)(B). For non-ERISA plans, suit in state court. In either case, the IRO record is admissible and often determinative.
State-process pointers
- California: Department of Managed Health Care (Knox-Keene plans) and Department of Insurance (PPO plans) both run NAIC-compliant external review under Health & Safety Code § 1374.30 and Insurance Code § 10169.
- New York: NY Insurance Law § 4914 governs external appeals; filed with the Department of Financial Services (DFS). The agency assigns the IRO and the decision binds the plan.
- Texas: Texas Insurance Code § 4202 establishes IRO process administered by the Texas Department of Insurance.
- Florida: Florida Statutes § 408.7056 governs the Statewide Provider and Subscriber Assistance Program; AHCA handles external review.
- Illinois: Health Carrier External Review Act, 215 ILCS 180/, administered by the Department of Insurance.
Each state's filing form, deadline, and proof-of-receipt mechanics differ slightly. See your state appeal page for filing instructions specific to your state.
Common mistakes
- Treating external review like another internal appeal. The IRO is independent and will read everything fresh. Re-state the case clinically and legally; do not assume it has the internal record.
- Missing the four-month deadline. No equitable extensions in most cases.
- Failing to submit new evidence. The IRO process is open-record. New literature, new physician letters, and updated guidelines are admissible. Send them.
- Skipping the expedited path. Whenever urgency applies, file expedited.
- Ignoring same-specialty review. Demand appropriate expertise.
Frequently asked questions
What is an external review and who runs it?
External review is the federally mandated independent re-decision of a denied claim by a third party - an Independent Review Organization (IRO) - after the plan's internal appeals are exhausted. It is required for non-grandfathered plans by the Affordable Care Act at 42 USC § 300gg-19, implemented at 45 CFR § 147.136. Either a state-administered process or a federal HHS-administered process applies depending on plan type and state.
Who pays for external review?
The plan pays. Under 45 CFR § 147.136(d) the federal external review process is administered through accredited IROs paid by the plan; the participant cannot be charged. State processes are similarly funded. The IRO assignment is randomized and cannot be selected by the plan.
Is the IRO's decision binding on the plan?
Yes. The federal regulation at 45 CFR § 147.136(d)(1)(iv) and the parallel state-flexibility provisions specify that the IRO decision is binding on both the plan and the claimant, except to the extent other remedies are available under state or federal law. If the IRO reverses the denial, the plan must provide coverage or payment within the timeframe specified by the regulation.
How long does external review take?
Standard external review: the IRO must issue its decision within 45 days of receipt of the request under 45 CFR § 147.136(d)(2)(iv). Expedited external review: 72 hours under 45 CFR § 147.136(d)(2)(v).
What is eligible for external review?
Adverse benefit determinations involving (1) medical judgment - including medical necessity, appropriateness, healthcare setting, level of care, effectiveness of a covered benefit, or the determination that a treatment is experimental or investigational - and (2) rescissions of coverage. Pure contractual exclusions (e.g., 'cosmetic surgery is not a covered benefit, period') generally are not eligible because there is no medical judgment to review.
What is a federal external review vs. a state process?
Self-funded ERISA plans almost always use the federal HHS-administered process via accredited IROs. Fully insured plans use the state external review process if the state has a process that meets the NAIC Uniform Health Carrier External Review Model Act standards or an alternate state process; if not, the state's plans default to the federal process. Most states have NAIC-compliant processes.
Can I submit new evidence at external review?
Yes. Under 45 CFR § 147.136(d)(2)(ii)(C), the IRO must consider any information submitted by the claimant. Unlike the strict closed-record rule in ERISA federal litigation, external review allows new clinical evidence, additional physician letters, and updated guidelines. This is your last full evidentiary opportunity - load it.
What if the IRO rules against me?
An adverse external review concludes the administrative process. For ERISA plans, the next step is suit in federal court under 29 USC § 1132(a)(1)(B). For non-ERISA plans, suit in state court under the policy. Some claimants also file a complaint with the state insurance commissioner or, for clear regulatory violations, with the DOL or HHS.
See also: expedited 72-hour appeal, ERISA appeals, insurance commissioner complaint, and your state's appeal rules at /appeal/state/[your state].