In 1996, Congress passed the Mental Health Parity Act. In 2008, it passed the Mental Health Parity and Addiction Equity Act, which significantly strengthened the original law. The premise of both was straightforward: insurance coverage for mental health treatment should be equivalent to coverage for medical and surgical treatment. You cannot impose a higher copay for a therapy session than for a cardiology visit. You cannot set stricter limits on mental health inpatient days than on medical inpatient days.
Thirty years later, insurers are still finding ways around it — and regulators are still letting them.
How insurers comply on paper and not in practice
The enforcement challenge with parity law is not that insurers openly violate it. They do not. The violation is more subtle: insurers apply non-quantitative treatment limitations — clinical criteria, prior authorization requirements, network adequacy standards — that are more stringent for mental health benefits than for comparable medical benefits. These limitations are harder to measure, harder to enforce, and nearly invisible to the average enrollee.
Insurers may comply on paper while using stricter nonquantitative treatment limitations in practice. The National Alliance on Mental Illness has documented this pattern extensively, and the American Medical Association has called for stronger enforcement of parity requirements, noting that behavioral health benefits continue to face higher barriers through prior authorization, network design, and other nonquantitative treatment limitations than comparable medical benefits.
The 2024 final rule
In September 2024, federal agencies finalized rules that expanded comparative analysis requirements for nonquantitative treatment limitations. The rule requires insurers to conduct and document analyses showing that their nonquantitative treatment limitations are no more restrictive for mental health than for medical benefits. The Department of Labor has published guidance on enforcement of this rule.
The rule is meaningful. It shifts the burden of proof from regulators to insurers. Whether it changes outcomes depends entirely on enforcement, and enforcement of parity law has historically been inconsistent across both federal agencies and state insurance departments.
What practitioners need to know
The parity law creates rights that practitioners can help their clients exercise. When a mental health claim is denied, the denial must be accompanied by specific clinical criteria used to make the determination. Those criteria can be — and should be — compared to the criteria the insurer uses for comparable medical decisions.
When that comparison reveals a disparity, it is a parity violation. It can be appealed. It can be reported to state insurance regulators. It can, in some cases, be litigated. The American Psychiatric Association has published practical guidance for practitioners on navigating parity rights.
Most practitioners are not aware of this. Most clients are not aware of this. The insurers are counting on that.
What to watch
Enforcement will determine whether the 2024 rule changes outcomes in practice. The battle over parity is ongoing — and whether the new requirements produce real change depends on whether federal and state regulators apply them with consistency.
The battle over parity is not over. Enforcement will determine whether the rule changes outcomes in practice.
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