Vident Partners provides vetted health insurance expert witnesses for cases involving benefit denials, ERISA claims procedures, medical necessity and utilization review, external review, and mental health parity. Request a referral today.
Find a Health Insurance Expert →Overview
A health insurance expert decides whether a benefit denial followed the plan, the rules and accepted claims practice: what the plan promised, who reviewed the claim, what criteria they used, and whether the process was fair. Most of these cases start with a single denial of surgery, a drug, a residential stay or a long hospital admission. This page covers member and patient coverage disputes under employer plans and individual policies. Payment fights between providers and payers belong to the medical provider insurance disputes page, and billing accuracy to a coding expert. Whether the care was medically needed may also call for a treating-specialty physician.
The first question is the type of coverage, because it decides almost everything else. ERISA generally supersedes state laws that relate to an employee benefit plan, while preserving state laws that regulate insurance 1. An insured employer plan and a self-funded plan may therefore sit under different rules, and an individual policy or government plan may fall outside ERISA entirely. Claim remedies, jury rights and the available evidence all follow from that sorting, so it should be settled before the expert is asked for an opinion.
Under ERISA, the plan's wording also sets the standard of review. Firestone v. Bruch (1989) held that a denial is reviewed de novo unless the plan expressly gives the administrator discretionary authority to determine eligibility or construe its terms 2. Where discretion exists and the same entity decides and pays claims, Metropolitan Life v. Glenn (2008) says that dual role is a conflict of interest that the reviewing court should weigh as a factor, with its significance depending on the circumstances 3. Whether outside expert evidence is allowed at all varies by circuit and by the standard of review, so counsel should confirm its use early.
ERISA's claims regulation gives the expert a checklist, and for many cases the violations are in the dates. For group health plans, urgent care claims must be decided within 72 hours, pre-service claims within 15 days, and post-service claims within 30 days, with limited extensions 4. A claimant must have at least 180 days to appeal a group health denial 4. A denial notice must state the specific reasons and the plan provisions relied on 4, and must identify any internal rule, guideline or protocol used 4. When an appeal turns on medical judgment, including whether care is experimental or not medically necessary, the fiduciary must consult a health care professional with appropriate training and experience in the field involved 4.
The expert reads the plan document and summary plan description, the claim notes, the medical policy in force on that date, reviewer credentials and reports, peer-to-peer records and all letters. Common findings include a reviewer outside the specialty, a guideline applied without the patient's facts, boilerplate reasons that shift between denial and appeal, and criteria that were not disclosed.
The Affordable Care Act added an outside step. Group plans and issuers must follow a state external review process meeting consumer protection standards, or a federal process that meets minimum standards 5. So the expert also checks whether the member was told of external review, and what the reviewer decided.
Mental health and substance use denials often raise parity. The statute requires that financial requirements for those benefits be no more restrictive than the predominant requirements applied to substantially all medical and surgical benefits 6, and treatment limits follow a similar rule. An expert compares how the plan applied medical necessity review, prior authorization and network rules on each side. Regulations in this area are unsettled. A 2024 final rule has staggered applicability dates, and in May 2025 the agencies announced they would not enforce its new requirements for a period while reconsidering it 7. The expert should state which rule version and which enforcement posture applied to the plan year at issue, and should separate agency enforcement from what a court may require.
No single credential covers this field. For process opinions, look for a senior claims or appeals leader, or a medical director, who ran utilization review at a health plan or third-party administrator in the same line of coverage. For clinical necessity, use a physician board certified in the relevant specialty. For parity, look for someone who has built or audited comparative analyses. The expert describes process and practice. Legal questions such as ERISA preemption and the standard of review stay with the court.
Under Firestone v. Bruch, an ERISA benefit denial is reviewed de novo unless the plan expressly gives the administrator discretionary authority to determine eligibility or construe the plan's terms.
Case Types
Denial of surgery, drugs or hospital care as not medically necessary
Experimental or investigational treatment denials
ERISA claims procedure violations
Residential and behavioral health treatment denials
Mental health parity claims
Rescission and pre-existing condition disputes under individual coverage
Utilization review and prior authorization practices
External review and appeal handling
Qualifications
Related Specialties
FAQ
For process, look for a senior claims, appeals or utilization review leader, or a medical director, who worked in the same line of coverage. For medical necessity, use a physician board certified in the specialty. No single credential covers the field.
Under Firestone v. Bruch, de novo unless the plan expressly gives discretion to the administrator or fiduciary. Where discretion exists and the same entity decides and pays claims, Metropolitan Life v. Glenn says the conflict is a factor the court should weigh, and its weight depends on the circumstances.
Under 29 CFR 2560.503-1, urgent care claims within 72 hours, pre-service claims within 15 days, and post-service claims within 30 days, with limited extensions. A claimant has at least 180 days to appeal. State rules can add requirements for insured coverage.
For group health appeals based on medical judgment, the fiduciary must consult a health care professional with appropriate training and experience in the field involved. The regulation also requires identification of experts whose advice was obtained on behalf of the plan.
Check the current status. In May 2025 the Departments announced non-enforcement of the 2024 rule's new requirements for a period while they reconsider it. The statute itself continues to apply. An expert should state the rule version and enforcement position for the plan year at issue.
In general, health insurance expert fees are determined by the expert themselves, based on a variety of criteria. Among those criteria are professional experience, forensic experience, medical specialty, regulatory knowledge, and publications. Vident does have some influence over expert fees by comparing experts within a specialty, but ultimately it is a personal decision by the expert.
Related Insights
In a previous post about health insurance fraud we wrote, “These fraudulent activities take a wide variety of forms, bearing witness to the inventiveness of those bent on health insurance fraud.”...
Practice Area IntelligenceMedical directors play a crucial role at health insurance companies, serving as the bridge between the medical and insurance worlds. Their responsibilities are diverse and essential for ensuring...
Case AnalysisExecutive SummaryOn June 12, 2025, the U.S. Supreme Court issued a unanimous 9-0 decision in A.J.T. v. Osseo Area Schools that fundamentally dismantled the primary legal shield public school districts...
Sources
Vident Partners connects attorneys with qualified health insurance expert witnesses. Complimentary consultation, 24-hour turnaround, no obligation.
Request an Expert →