Insurance Claim Denied Through Your Employer? ERISA Rights Explained

Why Claims Get Denied in Employer Plans

Employer-sponsored health insurance plans are the most common form of health coverage in the United States, covering roughly 155 million people. These plans are governed by a federal law called ERISA — the Employee Retirement Income Security Act — which creates a distinct legal framework for claim denials and appeals that differs from individual and marketplace plans.

Medical necessity disputes. The most common reason for claim denials in employer plans is the insurer's determination that a treatment or service is not medically necessary. Employer plan insurers and third-party administrators (TPAs) apply clinical criteria — often from InterQual, MCG, or proprietary guidelines — that may conflict with your treating physician's clinical judgment. Under ERISA, the plan administrator's discretion in making these determinations is significant, which makes thorough documentation even more critical.

Prior Authorization Denied: How to Appeal" class="auto-link">Prior authorization failures. Many employer plans require prior authorization for specific procedures, medications, imaging, and specialist referrals. Claims denied for lack of prior authorization are among the most common denial types. Some employer plans delegate prior authorization to the insurer (e.g., UnitedHealthcare, Cigna, Aetna), while others use separate utilization management companies.

Out-of-network care. Employer plans increasingly use narrow networks to control costs. Receiving care from an out-of-network provider — whether due to emergency circumstances, referrals, or lack of awareness about network status — can result in a denial or significantly higher cost-sharing. The federal No Surprises Act provides protections for emergency and certain non-emergency out-of-network care, but planned out-of-network services remain a common denial trigger.

Plan exclusions. Employer plans can exclude coverage for specific treatments, including experimental or investigational therapies, cosmetic procedures, and certain alternative treatments. These exclusions are defined in the Summary Plan Description (SPD) and Certificate of Coverage.

Self-funded vs. fully insured plans. A critical distinction in employer plans is whether the plan is self-funded (employer bears the financial risk) or fully insured (an insurance company bears the risk). Self-funded plans are regulated primarily by ERISA at the federal level and are generally exempt from state insurance laws. Fully insured employer plans are subject to both ERISA and state insurance regulations. This distinction affects which appeal process applies and which regulatory body has jurisdiction.

Your Rights Under ERISA

ERISA provides specific, enforceable rights for participants in employer-sponsored health plans.

Right to a Full and Fair Review

ERISA Section 503 and Department of Labor regulations (29 CFR 2560.503-1) guarantee your right to a "full and fair review" of any claim denial. This means:

• Written notice of denial: The plan must provide a written adverse benefit determination within specific timeframes — 30 days for pre-service claims, 72 hours for urgent claims, and 60 days for post-service claims. Extensions are permitted but must be communicated in writing.
• Specific content requirements: The denial notice must include the specific reason for the denial, the specific plan provisions relied on, a description of any additional information needed and why, a description of the appeal procedures and applicable time limits, and a statement of your right to bring a civil action under ERISA Section 502(a).
• Right to appeal: You have the right to at least one level of internal appeal (two levels for group health plans not subject to state law review).

Right to the Complete Claims File

Under ERISA, you have the right to request and receive, free of charge, all documents, records, and other information relevant to your claim. This includes the reviewer's notes, credentials, and qualifications, the specific clinical criteria or medical policies applied, any internal communications about your claim, and the plan's benefit description documents. This right is one of the most powerful tools in ERISA appeals — the insurer must give you the same information its own reviewers used to deny your claim.

Right to External Independent Review: Complete Guide" class="auto-link">External Review

Under ACA regulations applicable to ERISA plans, you have the right to external review after exhausting the internal appeal process. The external review is conducted by an IROs) Explained" class="auto-link">independent review organization (IRO) with no financial relationship to the plan or insurer. The external reviewer's decision is binding on the plan.

Right to Sue Under ERISA Section 502(a)

If your internal appeal and external review are denied, ERISA gives you the right to file a civil lawsuit in federal court under Section 502(a)(1)(B) to recover benefits due under the plan. Importantly, the court's review is generally limited to the "administrative record" — the documents and evidence that were before the plan administrator during the appeal. This means any evidence or arguments you want the court to consider must be submitted during the internal appeal process.

Strict Deadlines for the Plan

ERISA imposes strict deadlines on plan administrators:

• Pre-service claims: Decision within 30 days (15 days with one 15-day extension)
• Urgent claims: Decision within 72 hours
• Post-service claims: Decision within 60 days (30 days with one 30-day extension)
• Appeal decisions: Within 30 days for pre-service, 72 hours for urgent, and 60 days for post-service

If the plan fails to meet these deadlines, your claim may be "deemed denied" and you can proceed directly to external review or federal court.

Key Regulatory Bodies

U.S. Department of Labor (DOL) — Employee Benefits Security Administration (EBSA)

The Department of Labor's Employee Benefits Security Administration (EBSA) is the primary federal agency overseeing ERISA-governed employer health plans.

• Website: dol.gov/agencies/ebsa
• Hotline: (866) 444-3272 (toll-free)
• Online Complaint Form: Available on the EBSA website
• EBSA investigates complaints about ERISA plan violations, including failure to provide required notices, failure to follow appeal procedures, and fiduciary breaches

State Department of Insurance

For fully insured employer plans, your state Department of Insurance also has regulatory jurisdiction. You can find your state DOI through the NAIC directory. For self-funded plans, the state DOI generally does not have jurisdiction — ERISA preempts state insurance law for self-funded plans.

Centers for Medicare & Medicaid Services (CMS)

CMS oversees the federal external review process for self-funded ERISA plans that have not voluntarily adopted a state external review process.

Step-by-Step Appeal Process

Step 1: Get the Written Denial (Adverse Benefit Determination)

Obtain the plan's written adverse benefit determination. Under ERISA, this must include the specific reason for denial, the plan provision relied on, the clinical criteria applied (for medical necessity denials), and your appeal rights with deadlines.

Step 2: Request the Complete Claims File

Send a written request to the plan administrator for all documents, records, and information relevant to your claim. Under ERISA, the plan must provide these free of charge. This is one of the most important steps — the claims file reveals the reviewer's reasoning, the criteria applied, and any weaknesses in the denial that you can address in your appeal.

Step 3: Identify Your Plan Type

Determine whether your employer plan is self-funded or fully insured. This affects which appeal process applies and which regulatory body has jurisdiction. Your HR department or the plan's SPD should provide this information.

Step 4: Gather Medical Evidence

Work with your treating physician to compile medical records, a detailed letter of medical necessity, peer-reviewed literature, clinical practice guidelines, and functional assessments. Under ERISA, any evidence you want considered in a potential federal court review must be submitted during the administrative appeal process. Do not hold anything back.

Step 5: File the Internal Appeal

Submit your written appeal within 180 days of the denial. Address the plan's specific denial reason with targeted evidence and argument. For medical necessity denials, directly counter the clinical criteria the plan applied, using your physician's letter and supporting literature. Request an expedited appeal if your health situation is urgent.

Step 6: Request a Peer-to-Peer Review

Your treating physician can request a peer-to-peer review with the plan's medical director. This direct conversation between clinicians allows your doctor to present the clinical context and reasoning for the recommended treatment.

Step 7: File for External Review

If the internal appeal is denied, request external review. For self-funded plans, the federal external review process administered by CMS applies. For fully insured plans, your state's external review process applies. The external reviewer's decision is binding on the plan.

Step 8: File Complaints

File complaints as appropriate:

• EBSA for ERISA procedural violations (missed deadlines, failure to provide claims file, inadequate denial notice)
• State DOI for fully insured plan violations
• Both complaints can be filed concurrently with your appeal

Step 9: Consider Federal Court Action

If all administrative remedies are exhausted and the denial is upheld, consult with an ERISA attorney about filing a civil action under ERISA Section 502(a)(1)(B). ERISA litigation is specialized and benefits from experienced legal counsel.

External Review Options

External review for employer plans depends on whether the plan is self-funded or fully insured.

Fully insured plans: External review follows your state's external review process. An independent review organization evaluates your case, and the decision is binding on the plan.

Self-funded plans: External review follows the federal external review process established by CMS regulations. An IRO evaluates your case, and the decision is binding on the plan.

Eligibility: External review is available for denials based on medical necessity, appropriateness, health care setting, level of care, effectiveness of a covered benefit, and experimental or investigational treatment determinations.

Timeline: Standard external reviews are completed within 45 days. Expedited reviews for urgent cases are completed within 72 hours.

No cost: External review is free to the plan participant.

Deemed exhaustion: If the plan fails to comply with ERISA claims procedure requirements — including missing response deadlines — you may be deemed to have exhausted internal appeals and can proceed directly to external review or federal court.

Common Mistakes

Not requesting the complete claims file. This is the single biggest mistake in ERISA appeals. The claims file contains the reviewer's reasoning, the clinical criteria applied, and the basis for the denial. Without it, you are appealing blind.

Not submitting all evidence during the administrative appeal. Under ERISA, federal court review is generally limited to the administrative record — the evidence that was before the plan during the appeal. If you save evidence for court that was not submitted during the appeal, the court may refuse to consider it. Submit everything during the appeal.

Not understanding self-funded vs. fully insured. This distinction determines which appeal process applies and which regulatory body has jurisdiction. Many employees do not know whether their plan is self-funded, and this can lead to filing with the wrong regulatory body.

Missing the 180-day appeal deadline. ERISA gives you 180 days from the date of the adverse benefit determination to file an appeal. Missing this deadline can forfeit your appeal rights.

Not filing an EBSA complaint for procedural violations. If the plan missed response deadlines, failed to provide required information in the denial notice, or refused to provide the claims file, file an EBSA complaint. These procedural violations can support a "deemed exhaustion" argument that allows you to bypass the internal appeal.

Draft Your Appeal with ClaimBack

ERISA appeals require a specific approach — you need to address the plan's clinical criteria, build a complete administrative record, and meet strict deadlines. ClaimBack at claimback.app generates professional appeal letters tailored to your employer plan denial, incorporating ERISA-specific procedural citations, clinical evidence frameworks, and the documentation structure that builds the strongest possible administrative record. Whether your denial involves medical necessity, prior authorization, or a coverage dispute, ClaimBack helps you build a compelling case in minutes.

Conclusion

An employer plan claim denial is governed by ERISA, which gives you both powerful rights and strict requirements. The right to the complete claims file, the right to a full and fair review, and the right to external review and federal court action are significant protections — but only if you use them properly and within the applicable deadlines. Act promptly, request the claims file immediately, build a complete evidentiary record during the appeal, and use external review and EBSA complaints to maximize your leverage. Start your appeal today with ClaimBack at claimback.app.

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