How to Appeal a Mental Health Denial Using MHPAEA

Mental health and substance use disorder benefits are legally required to be covered at parity with medical and surgical benefits. When a mental health claim is denied, you have appeal rights that are stronger than most patients realize.

The Mental Health Parity and Addiction Equity Act

The federal Mental Health Parity and Addiction Equity Act, known as MHPAEA, prohibits insurers from imposing more restrictive coverage limitations on mental health and substance use disorder benefits than on comparable medical and surgical benefits.

This applies to financial requirements like copays and deductibles as well as non-quantitative treatment limitations like prior authorization requirements, step therapy protocols, and medical necessity criteria. If your insurer requires prior authorization for mental health inpatient care, it must apply the same standard to comparable medical inpatient care.

Parity violations are common and often go unchallenged because patients do not know to look for them. If your mental health claim was denied for medical necessity and you believe similar medical care would have been covered, you may have a parity claim.

Types of mental health denials

Medical necessity denials are the most common. The insurer decides the level of care requested (inpatient, partial hospitalization, intensive outpatient) is not clinically justified. These denials often cite the insurer's proprietary criteria rather than published clinical guidelines.

Level of care denials refuse the specific setting or intensity of treatment, often pushing patients to a less intensive level before the clinical picture supports it.

Concurrent review denials cut off coverage for ongoing treatment before the treating clinician believes it is appropriate to discharge.

Building your appeal

Request the specific clinical criteria used to deny the claim. Under federal law, you are entitled to this information. Compare the criteria to the InterQual or Milliman criteria, which are the most commonly used published standards. If the insurer's criteria are more restrictive, that may itself be a parity violation.

Your treating clinician's documentation is the foundation of the appeal. The documentation should address each denial criterion specifically and explain why continued treatment is medically necessary at the requested level of care.

If parity is the issue, file a parity complaint with your state insurance commissioner or the Department of Labor (for employer-sponsored plans) in addition to your clinical appeal. Regulators have enforcement authority that individual appeal processes do not.

External review and state protections

After exhausting internal appeals, you have access to independent external review. For mental health denials, many states require external reviewers with behavioral health expertise. The external review organization cannot be the insurer.

Several states have enacted stronger mental health parity laws than federal minimums. California, New York, and Illinois have been particularly active. Know your state's protections before limiting your appeal strategy to federal standards alone.

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Bill Advantage is a document literacy tool. Nothing in this article constitutes legal or medical advice.