What is the Mental Health Parity and Addiction Equity Act?
The Mental Health Parity and Addiction Equity Act (MHPAEA) was enacted in 2008 in response to decades of discrimination in insurance coverage for mental health and substance use disorder (MH/SUD) services. Prior to the MHPAEA, mental health insurance benefits had stricter limitations than physical or surgical services, including higher copayments, overly restrictive caps on therapy visits, and narrower provider networks. For example, a 2003 analysis by the U.S. Surgeon General’s Office found that many plans imposed annual visit caps as low as 20 sessions—roughly one session every 18 days—while physical health services had no such restrictions. These disparities discouraged treatment-seeking and left roughly 113 million Americans without adequate coverage, increasing the long-term societal costs of untreated mental health disorders, including higher rates of unemployment, homelessness, and incarceration.
In response to this discrepancy, the MHPAEA was designed to eliminate insurance-based discrimination, treating MH/SUD conditions with the same seriousness and financial coverage as physical health conditions. In 2008, the bill passed with bipartisan support during the George W. Bush administration, reflecting the nation’s shifting perception of mental illness and addiction as health conditions rather than moral failings. Senator Pete Domenici (R-NM), one of the bill’s original sponsors, emphasized this shift, stating that “…parity is about fairness…mental illness is not a choice and that treatment should not be a luxury.”
2008 MHPAEA Shortcomings
Despite the hopeful bipartisan sentiment, the practical implementation of the MHPAEA has fallen short. Although the bill sets a precedent for mental health parity, its lack of well-defined regulation has allowed employers to abuse legal loopholes that continue to undermine fairness. Notably, many providers used “ghost networks”, or health insurance plans where more than 80 percent of listed, in-network providers were unreachable, no longer practicing, not accepting new patients, or not in-network. Additionally, while the MHPAEA prohibits unequal financial treatment, it does not regulate provider reimbursement rates. Thus, insurers can provide lower reimbursement rates than they would for equivalent physical services.
Furthermore, studies have shown that despite the MHPAEA’s objective to increase equity, patients are still 10.6 times more likely to seek out-of-network care for their mental health needs when compared to physical services. This disconnect between the act’s goals and actual implementation shows that insurers have done the bare minimum of only complying with the formalities of the law. Their failure to address its core intent has prompted policymakers to draft the 2024 Final Rule to address this discrepancy.
What is the MHPAEA Final Rule?
In September 2024, the Departments of Labor (DOL), Health and Human Services (HHS), and the Treasury finalized the “Requirements Related to the Mental Health Parity and Addiction Equity Act.” This rule amended the 2013 MHPAEA regulations and implements additional requirements to ensure adequate funding for the MHPAEA’s new regulatory measures, bolstering enforcement and accountability.
The Final Rule accomplishes higher levels of accountability in several ways. First, it recognizes that true parity must extend beyond financial terms to include nonquantitative treatment limitations (NQTLs) such as network design, authorization, and reimbursement standards. These changes prevent insurers from exploiting legal loopholes, addressing the inaccessibility experienced under prior MH/SUD care.
Additionally, under the Final Rule, plans must document and justify that their NQTLs for MH/SUD are comparable in design and application to those used for medical or surgical benefits, both on paper and in practice. This includes its new requirement for detailed comparative analyses that examine factors like provider reimbursement, network adequacy, and denial rates. If these analyses reveal material differences, regulators may prohibit the use of those NQTLs until they are brought into compliance—eliminating the use of “ghost networks.”
To further enforce parity, the rule introduces a new “meaningful benefits” standard, which mandates that if a plan offers any benefits for MH/SUD conditions, those benefits must be substantial. Healthcare plans can no longer simply list mental health coverage as a benefit; they must demonstrate that those services are practically accessible and covered equally to physical services.
Why has HHS halted implementation?
While new regulatory measures were long-awaited, the 2024 Final Rule has not been implemented due to a combination of efficacy concerns, a pending lawsuit, and the administration change. On February 19, 2025, Donald Trump signed Executive Order 14219 titled “Ensuring Lawful Governance and Implementing the President’s ‘Department of Government Efficiency’ Deregulatory Initiative,” mandating federal agencies to pause regulations that impose undue burdens on small businesses, create significant compliance costs for private entities, or fail to explicitly demonstrate that benefits outweigh costs. While it does not revoke MHPAEA in its entirety, the order has created a regulatory freeze around the implementation of the 2024 Final Rule.
Additionally, in January 2025, the ERISA Industry Committee (ERIC) filed suit against the HHS, DOL, and U.S. Treasury over the Final Rule, claiming that it exceeds statutory authority under MHPAEA. The litigation states that the newly mandated “meaningful” benefits are not permitted by statute, arguing that the descriptors “meaningful” and “material differences” are too vaguely defined to be accurately implemented. More broadly, the ERIC lawsuit claims that the Final Rule imposes impractical standards for businesses to enact, especially with insufficient lead time. Subsequently, in May of 2025, the DOL, HHS, and U.S. Treasury requested a judicial abeyance to reconsider or potentially revise the Final Rule and publicly announced that they will not enforce it until 18 months after litigation formally concludes.
What are the Impacts of Postponement?
The 2024 Final Rule, if implemented, would apply to over 175 million Americans with private health insurance, including the 21.5 million Americans living with MH/SUD diagnoses. The scope of its potential impact was significant: the rule targeted not just superficial compliance, but the functional inequities that have persisted in MH/SUD coverage despite decades of reform.
These inequities stem from a disconnect between the letter of the law and the reality of implementation. Although the MHPAEA already requires equal coverage of both mental and physical health services, the aforementioned institutional barriers have long prevented this from being realized. As a result, mental health services remain harder to access. In short, the MHPAEA is insufficient without enforcement, network adequacy measures, accountability tools, and outcome data collection.
Disproportionate Impacts
It is also important to note that delays or suspension of the Final Rule do not impact all groups equally. Among adults reporting mental health issues, only 38 percent of Black adults, 36 percent of Hispanic adults, and 36 percent of Asian adults received care, compared to 56 percent of White adults. Additionally, minority groups routinely reported greater difficulty finding providers who understand their backgrounds and experiences. This can contribute to further mistrust and avoidance of mental health systems. These disparities present an urgent crisis, especially as Black and American Indian/Alaska Native groups face faster-rising rates of suicide and substance use disorder-related mortality. With equal enforcement paused, those who depend on in-network coverage will continue to struggle with underutilized plans, outdated directories, and lack of provider access.
Conclusion
The 2024 Final Rule was designed to strengthen parity protections and address persistent barriers in mental health and substance use disorder care. Its delay, whether due to regulatory caution, legal disputes, or implementation hurdles, leaves critical equity gaps in care access unresolved. Ultimately, postponement of the Final Rule further entrenches a two-tiered system where the most vulnerable remain at the back of the queue—or worse, off it entirely.