External Review

External review is an independent, outside-the-payer appeal available after internal appeals are exhausted — a real lever on ACA-regulated plans when the payer won't reverse itself.

External review (independent external review, or IRO review) is an appeal decided by an independent organization outside the payer, available after you've exhausted the plan's internal appeal levels. For ACA-regulated plans, patients — or providers appealing on their behalf — generally have the right to an external review after a final internal denial, typically within about four months. Because the reviewer is independent of the payer, it's a genuine lever on denials the payer keeps upholding internally out of institutional inertia, particularly medical-necessity and experimental/investigational denials where an outside clinical reviewer sees the case fresh. External review isn't available for every claim or every plan — self-funded ERISA plans follow their own rules, and the process differs between state-run and federal external-review programs — so knowing whether a given denial qualifies is part of the strategy. When it does apply, it's often the step that finally moves a stubborn medical-necessity denial, because the payer no longer controls the decision. The practical barrier is that external review comes late in the process and has its own deadline, so a practice has to have preserved the earlier appeal levels correctly to even reach it.

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