A health plan denial can feel final when the letter arrives, especially if it involves surgery, residential treatment, infusion therapy, out-of-network emergency care, or another high-stakes medical issue. But in many cases, the denial is not the end of the process. External review is the stage where an independent reviewer outside the insurance company takes a fresh look at certain denied health claims.
This matters because some denials turn on medical judgment, plan interpretation tied to federal protections, or questions about whether a service really fits the plan’s rules. In those situations, an outside reviewer may have the authority to reverse the denial and require the plan or insurer to honor the claim. Under the Affordable Care Act, non-grandfathered health plans generally provide internal appeals and access to external review, and the federal rules also extend external review to certain No Surprises Act disputes. CMS, U.S. Department of Labor, and the federal regulation at 45 C.F.R. § 147.136 outline the framework.
In this post you’ll learn what external review is, when it may be available, which denials often qualify, how the timing works, why “independent” does not always mean “simple,” and when an attorney may help you evaluate the next move. If you want the bigger picture on health-benefit disputes under ERISA, this broader guide to appeals, external review, COBRA, and benefit litigation gives useful context.
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External review is a formal process in which an independent review organization, often called an IRO, reviews a denial issued by a health plan or insurer. CMS describes it as a review by an organization independent of the insurer, and federal rules state that the external reviewer can uphold or reverse the denial. If the denial is reversed, the plan or insurer generally has to accept that decision. CMS, HealthCare.gov, 45 C.F.R. § 147.136
In plain English, this is the “someone outside the insurance company looks at it” stage. That outside reviewer is not simply re-reading the denial letter. The reviewer examines the claim, the medical records, the policy or plan terms, and any materials submitted during the appeal.
This process often comes after an internal appeal, but there are important exceptions. In urgent situations, an expedited external review may sometimes begin at the same time as an expedited internal appeal. HealthCare.gov, CMS
If you are new to the subject, this plain-language overview of independent review after a denial may help frame the basics before getting into deadlines and strategy.
For many people, external review rights come from a mix of federal law, state law, and plan design.
The Affordable Care Act added consumer appeal protections that generally require non-grandfathered group health plans and insurers to provide internal claims and appeal rights plus an external review process. The Department of Labor explains that these added protections also apply to rescissions, meaning retroactive cancellations of coverage. U.S. Department of Labor
Federal regulation 45 C.F.R. § 147.136 lays out key external review standards, including:
The practical path can differ depending on the coverage: