Mental Health Parity Final Rule (2024): What Employers Must Audit Before 2026

The 2024 Mental Health Parity Final Rule is the most consequential update to mental health coverage requirements since the Mental Health Parity and Addiction Equity Act (MHPAEA) was enacted in 2008. For employers who assumed their health plan was already compliant because it listed mental health benefits in the summary plan description, the rule delivers an uncomfortable message: listing a benefit and meaningfully covering it are not the same thing — and the federal government now has the analytical tools to tell the difference.

The final rule, published by the Departments of Labor, Health and Human Services, and Treasury in September 2024, takes effect for plan years beginning on or after January 1, 2025. That means most calendar-year plans are already operating under its requirements. Enforcement, however, is expected to ramp through 2025 and into 2026 — giving employers a narrow but real window to conduct internal audits and correct deficiencies before regulators come looking.

Here is what changed, what it requires of plan sponsors, and how to structure an audit that actually holds up.

What MHPAEA Has Always Required — and Where Plans Have Consistently Failed

MHPAEA prohibits group health plans from imposing more restrictive limitations on mental health and substance use disorder (MH/SUD) benefits than on comparable medical and surgical (med/surg) benefits. This parity requirement applies across two dimensions:

Quantitative Treatment Limitations (QTLs): Numerical limits such as visit caps, day limits, and dollar limits. A plan cannot cap inpatient psychiatric days at 30 while applying no equivalent cap to inpatient medical stays.

Non-Quantitative Treatment Limitations (NQTLs): Non-numerical restrictions such as prior authorization requirements, step therapy protocols, network admission standards, reimbursement rates, and utilization management criteria. A plan cannot require pre-authorization for outpatient mental health visits while imposing no such requirement for outpatient specialist visits of equivalent intensity.

In practice, QTL violations are relatively easy to identify and have largely been corrected across the market. NQTL violations are more pervasive, more subtle, and — until the 2024 final rule — harder for regulators to prove and harder for employers to self-audit.

The 2024 rule closes that gap directly.

What the 2024 Final Rule Changes

1. The Comparative Analysis Requirement Is Now Explicit and Enforceable

The CAA 2021 had already required plans to conduct and document a comparative analysis of NQTLs — demonstrating that the processes, strategies, evidentiary standards, and factors used to impose limitations on MH/SUD benefits were comparable to those used for med/surg benefits. The 2024 final rule sharpens this requirement significantly:

• Plans must now perform a written comparative analysis for each NQTL that applies to MH/SUD benefits
• The analysis must evaluate the limitation both as written (in plan documents and vendor contracts) and as applied in operation (in actual claims and utilization management decisions)
• Plans cannot rely on carrier or TPA representations alone — plan sponsors bear independent responsibility for ensuring the analysis is complete and accurate

The “as applied” standard is new and significant. A plan can be written correctly but administered in a discriminatory manner — for example, if prior authorization is technically required for both mental health and medical specialist visits but approval rates for mental health requests are substantially lower. The 2024 rule requires plans to look at outcomes data, not just policy language.

2. Plans Must Now Evaluate and Address Disparities in Access to In-Network Providers

The 2024 rule introduces a specific requirement to assess network composition as an NQTL. Plans must evaluate whether the design and application of their network — including reimbursement rates offered to MH/SUD providers, credentialing standards, and network adequacy criteria — results in MH/SUD benefits being offered under materially less favorable terms than med/surg benefits.

This is a direct response to a well-documented market reality: mental health provider networks have historically been narrower, reimbursement rates have been lower, and out-of-network utilization for mental health has been substantially higher than for medical care. Under the 2024 rule, that disparity isn’t just a market problem — it’s a potential parity violation.

Plans are required to collect and analyze data on in-network utilization rates, out-of-network claim rates, provider reimbursement rates (relative to med/surg), and network access metrics. If the data reveals a material disparity, the plan must take action to address it.

3. The “Meaningful Benefit” Standard

The 2024 final rule codifies the principle that a plan must provide meaningful benefits for MH/SUD conditions — not merely nominal coverage. A plan that lists mental health benefits but structures prior authorization, step therapy, or reimbursement in a way that makes those benefits effectively inaccessible is not compliant, regardless of what the plan documents say.

This standard is deliberately outcomes-focused and gives regulators significant latitude to find violations that weren’t catchable under a purely process-based review.

4. Increased Disclosure Obligations

Plans must now be prepared to provide their NQTL comparative analysis to the Departments upon request — and to plan participants or their authorized representatives upon request as well. The analysis must be sufficiently detailed that a reviewer can assess the methodology and conclusions without additional explanation.

Plans that cannot produce this documentation on demand are in a materially worse position than plans that can, regardless of whether their underlying design is compliant.

What Employers Must Audit Before 2026

The following audit framework covers the areas of highest regulatory focus and greatest compliance risk under the 2024 final rule.

Audit Area 1: NQTL Inventory and Comparative Analysis

What to do: Create a comprehensive inventory of every NQTL your plan imposes on MH/SUD benefits. For each one, document the corresponding NQTL applied to substantially all med/surg benefits in the same classification, and confirm that the processes and evidentiary standards used to impose the limitation are comparable.

Where to look: Your plan document, summary plan description (SPD), carrier or TPA administrative services agreement, utilization management program description, and pharmacy benefit management (PBM) formulary and step therapy protocols.

Common findings: Prior authorization requirements applied to mental health outpatient visits but not comparable medical specialist visits; step therapy protocols for psychiatric medications that are more restrictive than those applied to equivalent medical drug classes; more stringent concurrent review criteria for inpatient psychiatric stays than for inpatient medical stays.

Audit Area 2: As-Applied Analysis Using Claims and Utilization Data

What to do: Request at least 12 months of claims and utilization management data from your carrier or TPA, segmented by MH/SUD versus med/surg. Analyze approval rates, denial rates, average length of authorized treatment, out-of-network utilization rates, and appeals outcomes.

What to flag: Prior authorization denial rates for MH/SUD benefits materially higher than for med/surg benefits; out-of-network utilization rates for mental health substantially higher than for medical care (a proxy for network inadequacy); average authorized inpatient days for psychiatric admissions materially lower than for medical admissions of comparable acuity.

Who should conduct this: Your broker or benefits consultant, a third-party parity compliance specialist, or ERISA legal counsel. This is not a task that can be adequately performed by reviewing plan documents alone.

Audit Area 3: Network Composition and Provider Reimbursement

What to do: Request network adequacy data from your carrier, including the ratio of in-network MH/SUD providers to covered lives compared to the equivalent ratio for primary care and medical specialist categories. Request reimbursement rate benchmarks for MH/SUD providers relative to med/surg providers at equivalent service intensity.

What to flag: MH/SUD provider-to-enrollee ratios materially below med/surg ratios; MH/SUD reimbursement rates below market benchmarks that are driving provider network attrition; geographic gaps in MH/SUD network coverage that don’t exist for medical specialties.

Action required if disparity identified: The 2024 rule requires plans to take corrective action, not merely document the gap. This may involve working with your carrier to expand network recruitment, adjust reimbursement rates, or implement a clinical coverage policy change.

Audit Area 4: Written Comparative Analysis Documentation

What to do: Confirm that your plan has a written NQTL comparative analysis that meets the specificity required by the 2024 rule — covering each NQTL, documenting the methodology, and addressing both written terms and operational outcomes.

What to flag: Analysis documents that are generic templates not tailored to your specific plan; analyses prepared by the carrier or TPA that haven’t been reviewed and validated by the plan sponsor; analyses that address written plan terms but do not address operational or as-applied data.

Practical note: Many carriers and TPAs will provide a comparative analysis template. Receiving that template does not discharge the employer’s independent compliance obligation. The plan sponsor must review the analysis for accuracy, completeness, and applicability to their specific plan design.

Audit Area 5: Disclosure Readiness

What to do: Confirm that your plan can produce the NQTL comparative analysis, supporting data, and underlying methodology documentation within the timeframe required by a regulatory inquiry or participant request.

What to flag: Documentation stored with the carrier or TPA but not accessible to the plan sponsor; analysis documents that reference supporting data not actually in the plan’s possession; no defined process for responding to participant requests for parity compliance documentation.

Enforcement Risk: What the Regulatory Posture Looks Like in 2025–2026

The DOL’s Employee Benefits Security Administration (EBSA) has significantly expanded its MHPAEA enforcement program since the CAA 2021 comparative analysis requirement took effect. In its annual MHPAEA enforcement reports, EBSA has consistently found that the majority of plans reviewed had compliance deficiencies — and the 2024 final rule gives the agencies additional analytical tools and legal authority to pursue violations.

Enforcement actions can result in required plan design changes, corrective reprocessing of denied claims, civil monetary penalties, and — for egregious violations — individual fiduciary liability under ERISA. The reputational risk of a publicized enforcement action is an additional factor for larger employers and those in sectors with active employee advocacy.

Plans that have never conducted a formal NQTL comparative analysis are at substantially higher risk. Plans that have conducted one but have not updated it to reflect the 2024 rule’s as-applied and network composition requirements are also exposed.

Practical Timeline for Getting into Compliance

Immediately (Q2 2025 if not already done):

• Engage your broker, TPA, or ERISA counsel to assess your current comparative analysis documentation
• Request utilization management and claims data for as-applied analysis
• Identify whether your plan has a current, rule-compliant NQTL comparative analysis on file

Q3 2025:

• Complete the as-applied data analysis
• Conduct network composition review with your carrier
• Identify deficiencies and develop a remediation plan

Q4 2025 / Plan Year Renewal:

• Implement required plan design or administrative corrections
• Update NQTL comparative analysis documentation to reflect 2024 rule requirements
• Confirm disclosure readiness — can you respond to a DOL or participant request?

Ongoing (2026 and beyond):

• Build annual parity compliance review into your benefits calendar
• Require carriers and TPAs to provide updated utilization data annually
• Document each annual review in your plan fiduciary file

Bottom Line

The 2024 Mental Health Parity Final Rule doesn’t ask whether your plan lists mental health benefits. It asks whether your plan delivers them on equal terms — in writing, in operation, and through a network that employees can actually access.

For most employers, the honest answer to that question requires data they haven’t yet requested, an analysis they haven’t yet conducted, and documentation they haven’t yet produced. The enforcement window is open. The compliance window is narrowing.

Taylor Benefits Insurance Agency helps employers navigate MHPAEA compliance requirements, including NQTL comparative analysis review, carrier data requests, and plan design assessments. If your plan hasn’t been audited against the 2024 final rule, contact our team to understand where you stand before regulators ask the same question.