Guide

External review: the referee above the payer

Summary

External review is the appeal that sits outside the payer entirely: an independent reviewer, not employed by the insurer, decides whether a denial stands. It generally becomes available once a plan's own internal appeal has been completed and upheld. Which process applies depends on how the plan is regulated — a state-regulated fully-insured plan follows that state's external review statute, while a self-funded employer plan usually follows ERISA plans' own framework instead.

By Gale Editorial · Updated 2026-07-26. Every figure cited to a dated source. How we write.

When can a denial go to external review?

External review becomes available in most states once a plan's own internal appeal process has run its course and the payer has upheld the denial — not before. A few states and certain urgent-care situations allow a request to skip straight to external review when waiting for an internal decision would seriously jeopardize the patient's health. State-varies is the honest starting point for this whole topic: there is no single national deadline or eligibility rule here.

Because the exact trigger — full exhaustion versus an expedited exception — is set by whichever process governs the plan, the safest first move for a biller-of-one is not memorizing a national rule but confirming, plan by plan, whether the internal appeal has actually reached a final denial before filing for external review.

Who regulates the plan decides which process applies

Whether external review runs through the state or through a federal framework depends on how the patient's plan is funded, not on which state the practice sits in. State insurance departments regulate fully-insured plans, and the National Association of Insurance Commissioners coordinates the model laws that most states adapt into their own external review statutes 1Ref 1National Association of Insurance Commissioners (2026).National Association of Insurance Commissioners.That state insurance departments regulate fully-insured plans and that the NAIC coordinates model laws states adapt into their own statutes, including external review, and that the specific deadlines and mechanics genuinely differ by state.. A self-funded employer plan is a different animal entirely.

ERISA plans are governed by federal law rather than state insurance law, which is exactly why a state's external-review process or prompt-pay statutes often do not reach them — ERISA sets its own claims-and-appeals framework for those plans instead 2Ref 2U.S. Department of Labor (2026).ERISA.That self-funded employer plans are governed by ERISA rather than state insurance law, which is why state external-review and prompt-pay protections often do not reach them, and that ERISA sets its own claims-and-appeals framework for those plans.. The Summary Plan Description, or a call to the employer's HR or benefits administrator, is where a solo confirms which kind of plan they are actually appealing on behalf of before assuming a state process applies.

Finding your state's own external review process

Every state that regulates fully-insured plans publishes its own external review rules through its department of insurance, and those rules — the deadline to request review, how long the assigned independent reviewer has to decide, and whether the payer or the state selects the reviewing organization — genuinely differ from one state to the next 1Ref 1National Association of Insurance Commissioners (2026).National Association of Insurance Commissioners.That state insurance departments regulate fully-insured plans and that the NAIC coordinates model laws states adapt into their own statutes, including external review, and that the specific deadlines and mechanics genuinely differ by state.. There is no single national timeline to memorize here; the state layer of regulation is what actually sets these specifics.

The state's department of insurance website is the real source for those numbers, not a national summary, and checking it before a deadline passes matters more than guessing based on what a colleague in another state described. Bookmark it once and treat the deadline in that state's rule as the one that governs, not any figure that sounds familiar from a different jurisdiction.

What an independent reviewer actually looks at

External review exists to answer a specific kind of question — whether a denial rested on a clinical judgment, such as medical necessity or investigational-versus-standard treatment, that an outside clinician can independently evaluate. A denial resting on a plain contract exclusion, a benefit the plan never covered at all, is generally not the kind of question an external reviewer is positioned to overturn.

That distinction is worth confirming before investing the effort of a full submission: a medical-necessity denial, appealed with the clinical record and the payer's own coverage criteria, is a stronger external-review candidate than a denial resting on a benefit exclusion the plan document states outright. Reading which kind of denial is in front of you — clinical judgment or plain exclusion — before filing saves a request that was never going anywhere.

Reading the denial before you request review

Before requesting external review, the underlying denial is worth rereading with the same code discipline used on any remittance. The Claim Adjustment Reason Code names the category of the original denial, and the Remittance Advice Remark Code supplies the specific detail — both public, X12-maintained lists that resolve into a real answer rather than a guess about why a payer denied a claim 3Ref 3X12 (2026).Claim Adjustment Reason Codes.That CARCs are the standard code list explaining why a claim or service line was paid differently than billed, used here to read the original denial before drafting an external review request.4Ref 4X12 (2026).Remittance Advice Remark Codes.That RARCs supply the supplemental explanation beyond the CARC on a remittance, maintained by X12 as a public list, used here to build a specific rather than general external review request..

That reading matters for external review specifically because the request itself typically has to restate the basis of the denial and why the payer's own reasoning is wrong; a request built on the actual CARC and RARC, rather than a general sense of the denial, gives the independent reviewer something concrete to evaluate against the record.

Why it is worth the paperwork

Denials are common and formal review of any kind is rare, which is exactly why an external review request is worth filing when a case genuinely qualifies. KFF's analysis of federal transparency data found in-network denial rates in ACA marketplace plans averaging in the high teens as a share of claims, with wide variation among insurers, while consumers appeal well under one percent of denied claims 5Ref 5Kaiser Family Foundation (2025).Claims Denials and Appeals in ACA Marketplace Plans.That in-network claim denial rates in ACA marketplace plans average in the high teens with wide insurer variation, and that consumers appeal well under one percent of denied claims, framing why external review is underused..

External review sits one step past even that rare internal appeal, so a practice that reaches it at all is already ahead of the overwhelming majority of denied claims that are never contested past the first no. For a solo billing on a patient's behalf, treating external review as a real option rather than a last resort nobody actually uses is itself the differentiator.

What a payer's own materials tell you

Each payer publishes its own instructions for how a member or an assigned provider requests external review once the internal appeal is exhausted, and those instructions — not a general description — are the ones that actually apply to that claim. Anthem, for one named example, publishes its provider policies, including appeal mechanics, on its own provider portal 6Ref 6Anthem (2026).Anthem Provider Policies.That Anthem publishes its provider policies, including appeal mechanics, on its own provider portal — cited only as Anthem's own named example, never as what all payers do..

Reading the specific payer's own materials, rather than assuming the same steps apply everywhere, avoids missing a form or a deadline that differs plan to plan; your contract, and that payer's own published process, control — not a generalization borrowed from a different insurer's paperwork.

Filing on the patient's behalf

A biller-of-one submitting external review paperwork is almost always doing so as the patient's authorized representative, using an assignment-of-benefits or representative-authorization form the plan or state process requires — not automatically, just because the practice submitted the original claim. Confirming which authorization form a specific process requires, and attaching it, is a common reason otherwise-valid requests bounce back for a technicality.

Building a standing folder with the patient's assignment-of-benefits language, a clean copy of the original claim, the internal appeal denial letter, and the clinical note used in that appeal means external review paperwork can go out within the deadline rather than being assembled from scratch under time pressure once a final denial lands.

Common questions

External review is an appeal that moves a denial outside the payer entirely, to an independent reviewer who was not involved in the original decision. It typically becomes available once the plan's own internal appeal has been completed and the denial upheld, though some urgent situations allow it sooner. The exact process — deadlines, who assigns the reviewer — is set by the plan's regulator, which varies by plan type and state.

No. External review generally reaches denials that turn on a clinical judgment call — whether a service was medically necessary, for instance — because that is the kind of question an independent clinician can evaluate. A denial resting on a plain benefit exclusion the plan never covered typically is not eligible for the same process, since there is no clinical judgment to review.

A self-funded employer plan is governed by federal ERISA law rather than state insurance law, so a state's external review statute often does not reach it. ERISA sets its own claims-and-appeals framework for those plans instead. Checking the plan's Summary Plan Description, or asking the employer's HR department, is how to confirm which framework actually governs before assuming a state process applies.

The state's own department of insurance publishes its external review rules, including the request deadline and how long the assigned reviewer has to decide — figures that genuinely differ from state to state, so a colleague's experience in another state is not a reliable guide. Checking that state's site directly, rather than a general summary, is the only way to get the real deadline.

Rarely, but that is exactly the point. Denials are common and formal appeals are rare — consumers appeal well under one percent of denied claims even at the internal-appeal stage — so a practice that reaches external review on a genuinely strong case is already doing more than most. It is worth building the habit rather than treating it as a hypothetical.

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References

1.National Association of Insurance Commissioners (2026). National Association of Insurance Commissioners. NAIC. linkThat state insurance departments regulate fully-insured plans and that the NAIC coordinates model laws states adapt into their own statutes, including external review, and that the specific deadlines and mechanics genuinely differ by state.
2.U.S. Department of Labor (2026). ERISA. U.S. Department of Labor. linkThat self-funded employer plans are governed by ERISA rather than state insurance law, which is why state external-review and prompt-pay protections often do not reach them, and that ERISA sets its own claims-and-appeals framework for those plans.
3.X12 (2026). Claim Adjustment Reason Codes. X12. link ✓That CARCs are the standard code list explaining why a claim or service line was paid differently than billed, used here to read the original denial before drafting an external review request.
4.X12 (2026). Remittance Advice Remark Codes. X12. link ✓That RARCs supply the supplemental explanation beyond the CARC on a remittance, maintained by X12 as a public list, used here to build a specific rather than general external review request.
5.Kaiser Family Foundation (2025). Claims Denials and Appeals in ACA Marketplace Plans. KFF. link ✓That in-network claim denial rates in ACA marketplace plans average in the high teens with wide insurer variation, and that consumers appeal well under one percent of denied claims, framing why external review is underused.
6.Anthem (2026). Anthem Provider Policies. Anthem provider portal. link ✓That Anthem publishes its provider policies, including appeal mechanics, on its own provider portal — cited only as Anthem's own named example, never as what all payers do.

https://www.gale.care/for-providers/dn-external-review-state · 6 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.

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