Denied—Now What? Your Step-by-Step Roadmap for Challenging an Employer Benefits Decision

Receiving a denial notice for a medical claim, a disability benefit, or an FSA reimbursement request is a frustrating experience. It is also, in many cases, a reversible one. What most employees do not realize is that federal law—specifically the Employee Retirement Income Security Act of 1974, commonly known as ERISA—creates enforceable rights to appeal adverse benefits decisions made under employer-sponsored plans.

The appeals process is not simple, and it is rarely fast. But for employees who approach it methodically, it is often effective. This guide walks through each stage of the process, from the initial denial to regulatory escalation, and explains how to document and present your case for the best possible outcome.

Understanding Why Benefits Get Denied

Before mounting an appeal, it helps to understand the most common reasons benefits decisions go against claimants. In the case of health insurance claims, denials frequently fall into a few predictable categories:

• Medical necessity determinations: The insurer concludes that the treatment was not medically necessary based on its clinical criteria, even if your physician recommended it.
• Out-of-network disputes: Services were rendered by a provider the plan does not consider in-network, or prior authorization was not obtained.
• Coding and administrative errors: Incorrect procedure or diagnosis codes submitted by a provider trigger an automatic denial that has nothing to do with clinical merit.
• Plan exclusions: The service falls under a category the plan explicitly does not cover.

Disability claim denials often hinge on the plan's definition of disability—whether it requires inability to perform your specific occupation or any occupation—and on the sufficiency of medical documentation. FSA denials typically involve questions about whether an expense qualifies under IRS guidelines.

Knowing the stated reason for the denial is the essential first step. Every denial notice must, under ERISA, include a specific reason for the decision and a description of the plan's review procedures. If your denial notice lacks this information, the plan is already in violation of federal requirements.

The ERISA Framework: What It Means for Your Appeal Rights

ERISA governs most private employer-sponsored benefit plans, including health insurance, disability insurance, and FSAs. Under ERISA regulations, employees have the right to:

• Receive a written explanation of any adverse benefit determination
• Access all documents relevant to the claim, free of charge, upon request
• Submit an internal appeal with supporting documentation
• Receive a written decision on that appeal within specific regulatory timeframes
• Pursue external review of certain health insurance denials
• File a civil lawsuit in federal court if internal and external remedies are exhausted

The internal appeal is mandatory before you can pursue external remedies. Skipping this step—or missing the deadline to file it—can forfeit your rights under ERISA entirely. Deadlines vary by plan type: for urgent care claims, plans must respond within 72 hours; for non-urgent medical claims, the typical window is 60 days; for disability claims, up to 45 days with possible extensions.

Request your plan's Summary Plan Description (SPD) immediately. This document, which your employer is legally required to provide, outlines the specific procedures, deadlines, and grounds for appeal under your plan.

Building Your Internal Appeal: Documentation Is Everything

A well-constructed internal appeal is more than a letter expressing disagreement. It is a documented argument that directly addresses the stated reason for the denial and provides evidence to rebut it.

Step 1: Obtain the complete claim file. Under ERISA, you are entitled to copies of all documents, records, and other information relevant to your claim. Submit a written request to the plan administrator. This file will reveal the clinical criteria the plan used to evaluate your claim and the specific grounds for denial.

Step 2: Secure a letter of medical necessity from your treating physician. If the denial was based on a medical necessity determination, a detailed letter from your doctor explaining why the treatment was clinically appropriate—ideally citing peer-reviewed literature or clinical guidelines—directly counters the plan's position.

Step 3: Address the plan's clinical criteria explicitly. Many plans base medical necessity decisions on criteria from organizations such as InterQual or Milliman. If you can obtain these criteria (often through the claim file or a public request), your physician can explain how your condition meets them.

Step 4: Gather supporting records. Prior authorization records, referral documentation, provider network communications, and any correspondence with the plan should all be included in your appeal package.

Step 5: Submit everything in writing, with proof of delivery. Oral communications are difficult to document. Every submission should be in writing, sent via certified mail or a tracked electronic method, with copies retained.

FSA Reimbursement Disputes: A Narrower but Navigable Process

FSA denials are typically administrative in nature—the third-party administrator determined that a submitted expense does not qualify under IRS rules or the specific plan terms. The appeals process for FSA disputes follows the same ERISA framework, though the evidentiary requirements differ.

For healthcare FSA disputes, the key question is usually whether the expense constitutes a qualified medical expense under IRS Publication 502. Providing documentation from a licensed healthcare provider that the expense was for a specific medical diagnosis or treatment—rather than general wellness—often resolves borderline cases.

For Dependent Care FSA disputes, eligibility typically turns on whether the care was provided to a qualifying individual by a qualifying provider while both spouses were working or attending school. Documentation from the care provider, including their taxpayer identification number, is generally required.

External Review: The Step Most Employees Don't Know Exists

For health insurance denials, federal law—through the ACA and ERISA—requires that most employer-sponsored plans offer access to an independent external review organization after an internal appeal has been exhausted (or in certain cases, when the internal process is deemed inadequate).

External review is conducted by an Independent Review Organization (IRO) that is not affiliated with the insurance plan. The IRO's decision is binding on the plan in most circumstances, meaning the insurer must comply even if the determination goes against it. This is a powerful remedy that employees routinely fail to use.

To request external review, follow the instructions in your denial notice or contact your state insurance commissioner's office. Federal external review rights apply to most employer-sponsored plans, though self-insured plans (those in which the employer, rather than an insurance company, bears the financial risk) operate under federal rather than state oversight.

When to Escalate Beyond the Plan

If internal and external appeals have been exhausted without resolution, several additional avenues exist:

• The U.S. Department of Labor's Employee Benefits Security Administration (EBSA) handles complaints related to ERISA plan violations, including failure to follow proper procedures or provide required documentation. Filing a complaint with EBSA does not cost anything and can prompt regulatory intervention.
• State insurance commissioners have jurisdiction over fully insured employer plans and can investigate consumer complaints about claim handling practices.
• An ERISA attorney can evaluate whether a civil lawsuit in federal court is warranted, particularly for high-value disability or life insurance disputes. Many ERISA attorneys work on contingency for these cases.

Protecting Yourself Before a Denial Occurs

The most effective appeals are those built on documentation that was gathered before a denial was ever issued. Workers who keep organized records of prior authorization approvals, provider network confirmations, physician referrals, and plan communications are significantly better positioned to challenge adverse decisions than those who must reconstruct a paper trail after the fact.

Reviewing your plan's Summary Plan Description annually—particularly the sections covering claims and appeals procedures—ensures you understand the rules before you need them. Benefits denials are not always the final word. In many cases, they are the opening of a negotiation that employees have every right to pursue.