How to Make Employer Health Plans Comply with Mental Health Parity Requirements

The Mental Health Parity and Addiction Equity Act (MHPAEA) requires group health plans that cover mental health or substance use disorder (MH/SUD) benefits to apply treatment limitations no more restrictively than those applied to comparable medical and surgical benefits. Most employer plans are subject to MHPAEA, but compliance is not a checkbox — it is an ongoing documentation obligation with active DOL enforcement. The Consolidated Appropriations Act, 2021 (CAA 2021) added a mandatory written comparative analysis requirement that most plans were not prepared to produce. The final MHPAEA rule published September 9, 2024 (89 Fed. Reg. 73624) added data evaluation requirements effective for plan years beginning January 1, 2025. In its 2022 MHPAEA Report to Congress, DOL found that more than one in five plans failed to provide an adequate comparative analysis when requested — not because their designs were necessarily deficient, but because the required documentation did not exist. For insurance brokers, this is a substantive advisory gap with significant client value and meaningful E&O exposure if not addressed.

Prerequisites

  • The plan document and Summary Plan Description (SPD) for the current and proposed plan year
  • The plan's benefit design details: covered MH/SUD services, covered medical/surgical services, and the treatment limitations applied to each — visit caps, day limits, prior authorization criteria, step therapy protocols, network tier rules, and reimbursement rate methodologies
  • Prior authorization approval and denial rate data segmented by MH/SUD vs. medical/surgical, and in-network vs. out-of-network utilization data for each benefit classification — required under the 2024 final rule for the data evaluation component
  • Carrier or TPA contact for NQTL documentation, including the underlying prior authorization criteria, network adequacy standards, and evidentiary basis for plan design decisions
  • The comparative analysis from the prior plan year, if one exists

Step 1: Confirm Whether MHPAEA Applies to the Plan

MHPAEA, enacted under Pub. L. 110-343 and codified at ERISA §712, IRC §9812, and PHS Act §2726, applies to group health plans and health insurance issuers offering group or individual health insurance coverage. After the Affordable Care Act extended MHPAEA to the individual and small group markets beginning in 2014, nearly every employer-sponsored health plan is subject to parity requirements.

Two exemptions remain operative:

Employers with fewer than two employees on a typical business day in the prior calendar year are exempt under the original MHPAEA statutory carve-out. This exemption is narrow — a business with even two employees is covered.

Plans that do not cover any MH/SUD benefits in a given benefit classification have no parity obligation for that classification. MHPAEA does not require plans to cover mental health or substance use disorder benefits. But if a plan covers any MH/SUD benefits in any classification, parity requirements apply to every classification that includes covered benefits under 29 CFR §2590.712(b)(1). A plan that covers outpatient psychotherapy but not inpatient psychiatric care applies parity only to the outpatient classifications that include covered MH/SUD benefits.

Grandfathered plans under ACA §1251 are not exempt from MHPAEA. Grandfathered status exempts plans from certain ACA mandates — it has no effect on MHPAEA obligations, which predate the ACA. Confirm MHPAEA application for every employer client before advising that their plan is exempt. The most common incorrect exemption claim is that a small fully insured group is not covered — they are, under the ACA extension.

For employers that are Applicable Large Employers (50 or more full-time equivalent employees under IRC §4980H), MHPAEA compliance intersects with ACA employer mandate obligations — including the requirement to offer minimum value coverage that, for most plans, includes behavioral health benefits. See the ACA Employer Mandate compliance guide for the full ALE determination methodology and §4980H penalty structure.

Step 2: Inventory All MH/SUD and Medical/Surgical Benefits by Classification

MHPAEA parity is tested classification by classification — not across the plan as a whole. A plan cannot offset a restrictive outpatient behavioral health prior authorization requirement by pointing to generous inpatient psychiatric coverage. The six benefit classifications under 29 CFR §2590.712(c)(2)(ii) are:

  1. Inpatient, in-network
  2. Inpatient, out-of-network
  3. Outpatient, in-network
  4. Outpatient, out-of-network
  5. Emergency care
  6. Prescription drugs

For each classification where the plan covers both MH/SUD and medical/surgical benefits, document:

  • Every MH/SUD service covered in that classification (e.g., inpatient psychiatric hospitalization, residential treatment, intensive outpatient programs, outpatient therapy, medication-assisted treatment for substance use disorder)
  • Every medical/surgical service covered in the same classification (e.g., inpatient hospital, inpatient rehabilitation, inpatient skilled nursing, outpatient specialist visits, outpatient surgery)
  • Every treatment limitation applied to both categories — quantitative (visit caps, day limits, episode limits) and non-quantitative (prior authorization, step therapy, network restrictions, reimbursement rate differentials)

This benefit inventory is the foundation for both the quantitative treatment limitation test in Step 3 and the NQTL comparative analysis in Step 4. It is also the document most commonly absent when DOL opens an inquiry. Build it before the plan year is bound, not in response to a request letter.

Step 3: Test Quantitative Treatment Limitations for Parity

Quantitative treatment limitations (QTLs) are numerical caps: annual visit limits, day limits per episode, and lifetime maximums applied to specific benefit categories. QTL failures are the most visible parity violations and the easiest to audit prospectively.

The substantially all / predominant test under 29 CFR §2590.712(c)(3)(i): A QTL may be applied to MH/SUD benefits in a classification only if the same type of limitation applies to substantially all (at least two-thirds, measured by dollar value) of the medical/surgical benefits in that same classification. If the substantially-all threshold is met, the QTL applied to MH/SUD cannot be more restrictive than the predominant limitation — the level that applies to more than half of the medical/surgical benefits meeting the substantially-all threshold.

Working through a practical example: A plan limits outpatient behavioral health visits to 30 per year (in-network). To test parity, determine whether visit limits apply to substantially all (≥ two-thirds, by dollar value) of outpatient in-network medical/surgical benefits. If most outpatient medical/surgical coverage — specialist visits, physical therapy, occupational therapy, cardiac rehabilitation — has no visit cap, then a visit cap cannot be applied to outpatient behavioral health at all, regardless of the limit's level. If, instead, visit limits do apply to two-thirds of outpatient medical/surgical benefits, the most common (predominant) limit in that group is the maximum permitted for behavioral health.

Common QTL parity failures brokers encounter:

  • Annual outpatient visit caps on behavioral health with no comparable cap on medical specialist visits
  • Day limits on inpatient psychiatric stays that are lower than inpatient medical day limits
  • Separate lifetime dollar limits on MH/SUD treatment when no comparable limit applies to medical conditions
  • Residential treatment classified as "inpatient" for billing purposes but subject to lower day limits than inpatient medical stays

Correct identified failures in the plan design before binding coverage for the new plan year. For fully insured plans, carrier plan amendments can remove or raise visit caps. For self-funded plans, the plan document and TPA administrative guidelines control the design — the TPA must implement the corrected terms before the effective date.

Step 4: Conduct the NQTL Comparative Analysis Required by the CAA 2021

Non-quantitative treatment limitations are the primary enforcement target for MHPAEA compliance. Prior authorization requirements, step therapy protocols, network tier placement criteria, concurrent review, provider credentialing standards, and reimbursement rate differentials are all NQTLs — plan design features that restrict access to benefits without a numerical cap.

The parity standard for NQTLs under 29 CFR §2590.712(c)(4): An NQTL may be applied to MH/SUD benefits in a classification only if the processes, strategies, evidentiary standards, and other factors (PSEEF) used in designing and applying the NQTL to MH/SUD benefits are comparable to and applied no more stringently than those used in designing and applying the NQTL to medical/surgical benefits in the same classification.

CAA 2021 §203, codified at ERISA §712(a)(8), requires plans to document this comparison in writing. The written comparative analysis must include:

  • Each NQTL applied to MH/SUD benefits and the corresponding NQTL (or absence of one) applied to medical/surgical benefits in each affected classification
  • The PSEEF used to design each NQTL for both benefit categories — including the clinical evidence, actuarial data, or regulatory standards cited to justify the design choice
  • A comparison demonstrating that the PSEEF are comparable and applied no more stringently to MH/SUD than to medical/surgical benefits
  • Identification of any factors that differ between MH/SUD and medical/surgical NQTL design, with documented justification for each difference

What the analysis must not do: Listing NQTLs in parallel columns without comparing how they were designed is not a compliant analysis. DOL's 2022 enforcement report specifically identified comparative analyses that described the NQTLs applied to each benefit category without explaining whether the underlying processes, criteria, and evidentiary standards were the same. A list is not a comparison.

Broker role in NQTL analysis: The analysis must be prepared at the plan level. A carrier's standard template is not a substitute for an employer-specific analysis — the plan sponsor is responsible, not the carrier. Brokers can add significant value by helping employer clients request the carrier's underlying prior authorization criteria, network adequacy standards, and formulary design rationale, and by working with the carrier or TPA to assemble the required documentation. Whether the plan is fully insured or self-funded determines who controls the underlying criteria and therefore who must provide the data — see Fully Insured vs Self-Funded Health Plans: Which Structure Fits Your Employer Clients? for a detailed discussion of how plan funding structure affects compliance responsibility allocation between the plan sponsor, carrier, and TPA.

High-frequency NQTL parity failures:

  • Prior authorization required for outpatient behavioral health visits but not for outpatient specialty medical visits of equivalent frequency and complexity
  • Step therapy (fail-first) protocols for psychiatric medications with no comparable requirement for medical specialty drugs
  • Network reimbursement rates for out-of-network MH/SUD providers set lower than comparable out-of-network medical/surgical rates, with no documented evidentiary basis for the differential
  • Prior authorization for inpatient psychiatric admission with no corresponding requirement for inpatient medical admission
  • Concurrent review conducted more frequently for MH/SUD inpatient stays than for medical inpatient stays of comparable expected length

Step 5: Evaluate Network Composition and Access Data Under the 2024 Final Rule

The final rule published September 9, 2024 (89 Fed. Reg. 73624) added a data evaluation requirement that applies beginning with plan years starting on or after January 1, 2025. Plans must now collect and analyze relevant data to assess whether NQTLs are producing materially different access outcomes for MH/SUD benefits compared to medical/surgical benefits in the same classification.

What the data evaluation requires: Plans must collect and analyze data including:

  • In-network utilization rates for MH/SUD vs. comparable medical/surgical benefits in the same classification — if MH/SUD benefits have materially higher out-of-network utilization, this signals a potential network adequacy NQTL failure
  • Prior authorization approval and denial rates for MH/SUD vs. medical/surgical benefits — a materially higher denial rate for MH/SUD prior authorizations suggests the criteria are being applied more stringently
  • Network adequacy metrics: time and distance standards, provider-to-patient ratios, and appointment availability for MH/SUD vs. medical/surgical providers in the plan's service area
  • Reimbursement rate comparisons for out-of-network providers

Responding to material disparities: If the data analysis identifies a material difference in access outcomes — for example, that 35% of behavioral health claims are processed out-of-network compared to 8% of medical/surgical claims in the same classification — the plan must evaluate whether an NQTL is causing the disparity. A material disparity does not automatically mean a parity violation, but it requires documented explanation. If the investigation cannot identify a non-parity explanation for the disparity, the plan must take corrective action.

Practical implementation: Build data collection requirements into TPA service agreements and carrier reporting requirements at renewal — not as a post-plan-year exercise. TPAs and carriers that process claims have the utilization and prior authorization data; the obligation is on the plan sponsor to require it in the service agreement. Brokers who help employer clients negotiate TPA reporting requirements at renewal are delivering compliance infrastructure that will be needed each plan year.

Step 6: Produce and Maintain the Written Comparative Analysis

The written comparative analysis must exist before the plan year begins and be available for production within 10 business days of a request. These are independent requirements.

Production deadline: Under ERISA §712(a)(8)(C), plans must provide the comparative analysis to DOL, HHS, IRS, or an authorized participant or beneficiary representative within 10 business days of a written request. Missing this deadline is an independent ERISA violation subject to penalties under ERISA §502(c)(1) — currently $116 per day per participant (DOL 2025 adjustment), assessed from the date the request was received until the analysis is produced. For a 100-participant plan, a 30-day delay costs $348,000 in maximum penalties. DOL enforces this deadline independently of whether the plan's substantive design passes the QTL and NQTL tests.

Analysis must be complete, not in-progress: A plan that begins assembling the comparative analysis after receiving a DOL request is not in compliance. The analysis must be a completed document describing the prior plan year's design — not a work in progress assembled in response to enforcement inquiry.

Annual update requirement: Any plan amendment, carrier change, TPA change, or benefit redesign that affects covered benefits or treatment limitations requires an updated comparative analysis before the change takes effect. Maintaining a stale analysis for a plan that has materially changed since the prior year is a compliance failure. The most common trigger is a mid-year carrier or TPA change — the new carrier's or TPA's prior authorization criteria, network standards, and formulary design may differ materially from the prior vendor's, requiring a fresh analysis before the transition date.

Retention: Maintain the comparative analysis and all supporting documentation — benefit inventory, NQTL criteria documentation, carrier and TPA responses, data analysis — for at least six years under ERISA §107's general plan record retention requirement.

Step 7: Remediate Identified Parity Defects Before the Plan Year

When the audit in Steps 3 and 4 identifies parity failures, the broker's role is to facilitate correction before binding coverage. Open enrollment is the natural checkpoint for plan design corrections — changes made mid-year are administratively complex and require retroactive benefit adjustments if participants were denied coverage based on a non-compliant limitation during the plan year. See How to Manage Open Enrollment Compliance for Employer Health Plan Clients for the full compliance calendar and notice requirements that run parallel to plan design review.

Common remediation approaches:

  • Remove or adjust visit caps: Carrier plan amendments can typically eliminate or raise outpatient visit limits to match the medical/surgical standard. For self-funded plans, the plan document is amended and the TPA updates administrative guidelines.

  • Revise prior authorization criteria: Work with the carrier or TPA to document that the criteria applied to MH/SUD prior authorizations are developed using the same clinical evidence and actuarial standards as medical/surgical criteria. Where they differ without justification, the criteria must be aligned — either by removing MH/SUD-specific requirements or by documenting a legitimate non-parity basis for the distinction.

  • Address network composition: If the plan's in-network behavioral health provider network is materially inadequate compared to the medical/surgical network — measured by time/distance standards or provider-to-patient ratios — this is a network composition NQTL requiring documented justification or corrective action. Carriers in markets with known behavioral health provider shortages may need to expand networks or document why the shortage is not attributable to plan design choices.

  • Document all corrections: Parity corrections made before the plan year represent prospective compliance. For plan years where the design was non-compliant, DOL may require retroactive relief — covering claims that were denied based on the non-compliant limitation. Document remediation steps with dates, the prior design, the corrected design, and the individuals responsible for implementation.

Common Mistakes

Relying on the carrier's parity certification without a plan-level analysis. Carriers can represent that their standard plan designs are parity-compliant, and many provide NQTL attestation letters. These carrier representations are not a substitute for a plan-specific comparative analysis under ERISA §712(a)(8). The plan sponsor is the responsible party; a carrier attestation may inform the analysis but does not replace it.

Testing parity across the whole plan rather than by classification. Parity analysis is required separately in each of the six benefit classifications. Generous inpatient psychiatric coverage cannot offset a restrictive outpatient behavioral health prior authorization policy — they are in different classifications and tested independently.

Treating plans as compliant because they removed visit caps. Removing visit caps eliminates the most visible QTL failures, but NQTL violations — particularly prior authorization stringency and network adequacy disparities — are where most enforcement actions originate. A plan with no visit caps and a prior authorization requirement for all outpatient behavioral health visits (with no comparable requirement for outpatient medical visits) is still non-compliant.

Missing the 10-business-day production window. DOL MHPAEA investigations often begin with an information request, not a formal investigation notice. A plan that cannot produce the comparative analysis within 10 business days triggers immediate penalty exposure regardless of whether the plan's substantive design is compliant.

Failing to update the analysis when plans change. Mid-year carrier transitions, benefit amendments, and TPA changes all require a contemporaneous update to the comparative analysis. A stale analysis covering a design that no longer exists is a compliance failure.

Not building data collection into TPA service agreements. The 2024 final rule's data evaluation requirement cannot be satisfied with data that was not collected during the plan year. Retroactive data reconstruction from claims files is possible but time-consuming and often incomplete. Build data collection obligations into the TPA contract at renewal.

Frequently Asked Questions

Does MHPAEA apply to small employers with fewer than 50 employees?

MHPAEA applies to virtually all employer-sponsored group health plans that cover MH/SUD benefits, including those sponsored by employers with as few as two employees. The sole statutory exemption covers employers with fewer than two employees on a typical business day in the prior calendar year. Small employers sponsoring fully insured group health plans have been subject to MHPAEA since the ACA extended parity to the small group market effective January 1, 2014.

What triggers a DOL MHPAEA inquiry?

DOL can initiate an MHPAEA review as part of a general plan audit, in response to a participant complaint filed with DOL, or through targeted enforcement initiatives. DOL has conducted targeted MHPAEA enforcement programs since 2017, with escalating focus on NQTL comparative analysis compliance after the CAA 2021. An inquiry typically begins with a written request for the plan's NQTL comparative analysis, supporting documentation, and plan design details — and the 10-business-day production deadline begins from the date of that request.

Are grandfathered plans under the ACA exempt from MHPAEA?

No. Grandfathered plan status under ACA §1251 exempts plans from certain ACA-specific mandates (preventive services, cost-sharing limits, and annual limits on essential health benefits). It does not affect MHPAEA obligations, which predate the ACA and operate under a separate statutory framework. Grandfathered plan sponsors are required to comply with the CAA 2021 comparative analysis mandate and the 2024 final rule requirements.

What are the penalties for a MHPAEA violation?

Parity violations expose plans to overlapping penalty regimes. Under ERISA §502(c)(1), failing to provide the comparative analysis within 10 business days of a DOL request carries a penalty of $116 per day per participant (2025 rate, adjusted annually by DOL). Under IRC §9812(b)(3), substantive MHPAEA violations trigger an excise tax of $100 per day per participant. DOL may also order retroactive benefit relief for participants who were denied access to MH/SUD benefits because of a non-compliant treatment limitation, which can significantly increase total remediation cost.

Can an insurance broker be held liable for a client's MHPAEA violation?

The plan sponsor — typically the employer — is the party responsible for MHPAEA compliance under ERISA. However, brokers who designed the plan, represented that the plan was parity-compliant, or failed to identify apparent violations that a competent review would have caught may face E&O claims from clients who incur DOL penalties. Documenting the scope of your compliance review, the recommendations you made, and any limitations on your engagement is essential. Brokers providing compliance advisory services should confirm their claims-made E&O policy's retroactive date covers the full period of advisory services, since parity violations can surface during DOL audits that occur well after the plan year in which the violation occurred.

Does the 2024 final rule apply to plans already mid-year on January 1, 2025?

The 2024 final rule (89 Fed. Reg. 73624) is effective for plan years beginning on or after January 1, 2025. A calendar-year plan that began January 1, 2025 is subject to all requirements of the final rule, including the data evaluation requirements. An off-calendar plan (e.g., July 1 plan year) with a plan year that began July 1, 2024 is subject to the prior regulatory framework for that plan year, but must comply fully with the 2024 final rule beginning July 1, 2025.

What if the carrier refuses to provide NQTL criteria needed for the analysis?

For fully insured plans, the carrier controls much of the information required for the NQTL comparative analysis — prior authorization criteria, network tier placement standards, and the evidentiary basis for plan design decisions. If a carrier declines to provide this information, the plan sponsor should document the request and the carrier's refusal in writing. This does not excuse non-compliance, but it provides a factual record of good-faith compliance efforts. Brokers can escalate through the carrier's compliance or legal department, framing the request under the CAA 2021 statutory obligation. Plans that cannot obtain needed information despite documented requests should consult with ERISA benefits counsel about disclosure alternatives.

Arvori helps insurance brokers manage group health plan compliance documentation, structure MHPAEA analysis workflows, and deliver structured benefit reviews that add value beyond placement. Learn more at arvori.app.