Table of Contents
- 7 Mental-Health-Parity Mistakes That Cause Claimants to Miss Stronger Arguments
- 1. Treating The Case As Only A Medical-Necessity Dispute
- 2. Comparing Mental Health Treatment To The Wrong Medical Benefit
- 3. Ignoring NQTLs And Focusing Only On Explicit Visit Limits
- 4. Failing To Request The Documents That Reveal The Real Rule
- 5. Overlooking Network And Reimbursement Barriers
- 6. Assuming The New 2024 Rule Is The Whole Story
- 7. Waiting Too Long To Build The Administrative Record
- Why These Mistakes Matter More Than People Think
- Final Takeaway
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7 Mental-Health-Parity Mistakes That Cause Claimants to Miss Stronger Arguments
Mental health parity appeals often look straightforward on the surface: a plan denied residential treatment, intensive outpatient care, eating-disorder treatment, or substance use disorder care, and the claimant argues the denial was unfair. But many otherwise solid appeals lose force because they focus on the wrong issues, ask for the wrong records, or compare the wrong benefits.
That matters because federal parity law can be broader than many claimants realize. The Mental Health Parity and Addiction Equity Act, or MHPAEA, generally bars plans from applying financial requirements and treatment limitations to mental health and substance use disorder benefits in a more restrictive way than they apply comparable medical and surgical benefits. Federal agencies have continued to report widespread compliance problems, especially around nonquantitative treatment limitations, often called NQTLs—the behind-the-scenes rules that shape access to care through medical-necessity criteria, prior authorization, network design, reimbursement methods, and similar coverage controls. The Department of Labor’s 2025 Report to Congress describes corrections affecting more than 18 million participants during the reporting period, and notes that CMS continued to see zero comparative analyses that were sufficient on first submission. Federal regulators have also clarified that participants and their authorized representatives can request comparative information and other documents relevant to how an NQTL was applied.
In this post you’ll learn seven common parity mistakes that can weaken an appeal, what stronger framing may look like, and how an attorney may help turn a denial into a more evidence-based challenge. If you want a broader foundation first, it may help to start with this overview of how parity rules work in practice.
Scroll to the bottom for every post in this series.
1. Treating The Case As Only A Medical-Necessity Dispute
One of the most common mistakes is arguing only that the treatment was “medically necessary,” without asking whether the standard used to judge medical necessity was itself applied unequally.
That distinction often changes the whole appeal.
Many denial letters focus on symptoms, progress notes, risk level, or discharge planning. Claimants then respond by sending more clinical evidence and arguing that the reviewer got the facts wrong. Sometimes that helps. But in parity cases, another question often matters just as much: Was the plan using a tougher rule for behavioral health care than it used for comparable medical or surgical care?
Federal guidance has repeatedly emphasized that plans must disclose the criteria for medical-necessity determinations for mental health and substance use disorder benefits, and must also disclose the reasons for denials. In ERISA-covered plans, claimants on appeal also have rights to documents relevant to the claim, including materials relied on, generated, or considered during the decision-making process. Those materials can include policies, guidelines, and information showing how the plan ensures consistent decision-making. DOL’s claims-procedure guidance lays out that disclosure framework, and the parity FAQs explain that these documents can include analyses of how an NQTL complies with MHPAEA.
Here’s what this often means in practice: a claimant may have a stronger argument if the appeal asks not only, “Was this treatment necessary?” but also, “What criteria did you use, where did they come from, and how do they compare with the criteria used for analogous medical/surgical care?”
That is often where stronger parity arguments begin.
2. Comparing Mental Health Treatment To The Wrong Medical Benefit
Parity arguments rise or fall on comparison. If the comparison is off, the appeal can lose traction even when the denial feels deeply unfair.
For example, residential mental health treatment is often compared to some form of intermediate medical or surgical care, not necessarily to acute inpatient hospitalization. Courts and regulators have repeatedly wrestled with this issue, and recent decisions continue to show how important the comparator question is. In Ryan S. v. UnitedHealth Group, Inc., the Ninth Circuit reiterated that a parity claim turns on whether the plan imposed a more restrictive limitation on mental health treatment than on medical and surgical treatment, and the court allowed the plaintiff’s parity theory to move forward at the pleading stage. The opinion also reflects the broader reality that parity pleading can be difficult and fact-specific.
At the agency level, parity guidance has likewise stressed classification consistency. The 2024 final rule stated that comparable intermediate medical/surgical benefits and intermediate mental health/substance use disorder benefits must be assigned consistently across the existing classifications, although in May 2025 the Departments announced they were reconsidering parts of that 2024 rule and would not enforce the new provisions while litigation is pending and for an additional 18 months after a final decision. Even so, the agencies also stated that MHPAEA’s underlying statutory obligations, as amended by the Consolidated Appropriations Act of 2021, remain in effect. That enforcement statement is important because it means parity arguments did not disappear; the regulatory landscape just became more complicated.
A stronger appeal often identifies the closest analog: skilled nursing, inpatient rehabilitation, hospice, home health, or another medical/surgical service that functions at a similar level of care or under a similar utilization-management framework. If you are trying to spot these issues early, it may help to read more about how to recognize possible parity problems in a health plan’s rules and denials.
3. Ignoring NQTLs And Focusing Only On Explicit Visit Limits
Some claimants assume parity only applies to obvious numerical restrictions like day caps, visit limits, or separate deductibles. Those issues matter, but modern parity disputes often center on NQTLs—rules that are not expressed numerically yet still control access to care.
Common NQTL examples include:
- prior authorization requirements
- concurrent review practices
- fail-first expectations
- provider credentialing standards
- network admission standards
- reimbursement methodologies
- medical-necessity criteria
- exclusions based on facility type or licensing details
- out-of-network exceptions when in-network care is not realistically available
Federal enforcement trends show just how central NQTLs have become. The 2025 Report to Congress describes enforcement results involving prior authorization, network adequacy, and access barriers, including corrective action affecting millions of participants. The same report says that, since 2021, EBSA’s NQTL enforcement work has cumulatively led to compliance changes across more than 77,000 plans and issuers.
This is why an appeal that only says “my therapist recommended more treatment” may miss the stronger issue. If the plan applied a utilization-management process, reimbursement formula, or facility standard more stringently to behavioral health care than to comparable medical/surgical care, the better argument may be about the coverage rule itself, not just the claimant’s symptoms.
If you are building an appeal record, it can also help to think about ways to structure a stronger challenge around coverage language and treatment limits, because parity disputes often turn on plan terms more than people expect.
4. Failing To Request The Documents That Reveal The Real Rule
Another major mistake is appealing the denial without requesting the documents that show how the plan actually made the decision.
Claimants often send letters from treating providers, progress notes, and journal articles, but never ask for the reviewer’s criteria, the internal guidelines, the plan language relied upon, the denial codes, or the parity-related comparative materials. That can leave the record one-sided.
Under federal parity guidance, participants, beneficiaries, and authorized representatives may request medical-necessity criteria for both behavioral health and medical/surgical benefits, as well as information about the processes, strategies, evidentiary standards, and factors used to apply NQTLs. The Part 45 FAQs explain that these materials can include any analyses the plan performed to assess parity compliance. The Department of Labor has also published a consumer guide to disclosure rights and a disclosure request template that can help claimants identify the categories of information worth seeking.
For ERISA-governed plans, claims-procedure rules also require access to “relevant” documents, which includes items relied on, submitted, considered, or generated during the benefit determination, plus policies or guidance concerning the denied treatment option or diagnosis. DOL’s claims-procedure guidance spells this out in useful detail.
In general terms, the appeal often gets stronger when the claimant asks for records that answer questions like these:
- What exact guideline was used?
- Who authored it?
- Was it plan-specific or outsourced?
- What evidentiary standards were used?
- What analogous medical/surgical benefit was compared?
- How is this rule applied outside behavioral health?
- Was there any out-of-network exception process?
- Were internal policies or coding rules involved?
An attorney may be able to identify which document requests are most likely to surface a meaningful parity issue instead of just more paperwork.
5. Overlooking Network And Reimbursement Barriers
Parity disputes are not limited to outright denials of care. Sometimes the problem is that coverage exists on paper, but meaningful access is blocked by network design, reimbursement practices, or payment methods that leave behavioral health treatment functionally out of reach.
That issue has drawn increasing enforcement attention. The 2025 DOL Report to Congress describes enforcement action involving network adequacy and price protections when in-network mental health or substance use disorder care was unavailable. Earlier agency materials have also emphasized that NQTLs include network composition and reimbursement methodologies, not only clinical review criteria. The DOL fact sheet on the 2024 parity rule highlighted those concerns as part of the government’s broader push to address persistent coverage disparities.
This can matter in cases involving:
- ghost networks or very limited behavioral-health panels
- reimbursement methods that make mental health providers less likely to participate
- refusal to cover out-of-network care even when in-network treatment is not realistically available
- stricter credentialing or admission standards for behavioral-health facilities
- narrower exceptions processes for mental health care
Claimants sometimes miss stronger arguments here because they frame the problem as “I chose an out-of-network provider,” when the more complete issue may be “The plan’s network and reimbursement structure made comparable in-network behavioral health treatment materially harder to access.”
That kind of argument is often highly fact-specific, which is one reason experienced counsel can be valuable.
6. Assuming The New 2024 Rule Is The Whole Story
Parity law has been evolving quickly, and many people understandably assume the newest federal rule is the entire legal framework. As of April 11, 2026, that is not the full picture.
In September 2024, the Departments of Labor, HHS, and Treasury issued a final rule strengthening parity requirements, especially around NQTL comparative analyses and data-driven standards. The rule became effective on November 22, 2024, with staggered applicability dates beginning in 2025 and 2026. But on May 15, 2025, the Departments announced that they were reconsidering the 2024 final rule after litigation filed by ERIC on January 17, 2025, and said they would not enforce the new portions of that 2024 rule until after the litigation ends and for an additional 18 months. At the same time, the agencies expressly stated that MHPAEA’s statutory obligations, as amended by the Consolidated Appropriations Act of 2021, remain in effect, and that plans may still refer to the 2013 final rule and existing subregulatory guidance. That statement is here.
Why does this matter for appeals? Because some claimants may abandon good arguments after hearing that the 2024 rule is “on hold.” But parity challenges can still draw strength from the statute itself, the 2013 rule, CAA 2021 comparative-analysis requirements, claims-procedure rights, and existing guidance. The legal path may be more nuanced than a single headline suggests.
An attorney may help sort out which parity theories remain available under the current enforcement posture and which ones depend more heavily on the contested 2024 provisions.
7. Waiting Too Long To Build The Administrative Record
Even a strong parity theory can weaken if it is raised too late.
Many claimants do not realize how important the administrative record can become, especially in ERISA cases. If the key comparisons, disclosure requests, and plan-specific objections are not raised during the internal appeal, later litigation can become harder. The same is true for external review timing in plans governed by the Affordable Care Act’s appeals structure.
CMS explains that consumers generally have rights to both internal appeal and independent external review for many health plan decisions, with state or federal external review processes applying depending on the plan and jurisdiction. CMS’s external appeals guidance outlines that framework. Related CMS materials also explain that urgent cases may qualify for expedited handling and that external review can provide an independent decision-maker after the insurer upholds a denial. See CMS’s overview here.
The practical mistake is not simply “missing a deadline,” though that happens too. It is also failing to place the right issues into the record while there is still time to do so. A more developed appeal often includes:
- the plan language at issue
- the denial letter and codes
- requested disclosure materials
- the comparator theory
- the NQTL theory
- provider support
- evidence about network inadequacy or unavailable alternatives
- objections to inconsistent or unexplained criteria
That does not guarantee a reversal, but it often creates a clearer, more evidence-based foundation for later review.
Why These Mistakes Matter More Than People Think
Mental health parity cases can look deceptively simple. A plan says treatment was unnecessary, or out of network, or not at the right level of care. The claimant disagrees. But the stronger case is often not about whether the claimant “deserved” coverage in a general sense. It is about whether the plan used a rule, process, evidentiary standard, network design, or reimbursement method that treated behavioral health more harshly than comparable medical/surgical care.
That is why parity claims often turn on details that are easy to miss without experience:
- the right comparator
- the right disclosure request
- the right NQTL framing
- the right timing
- the right plan documents
- the right record for appeal or litigation
And those details matter in a legal environment where regulators continue to document widespread parity-compliance problems. The government’s own reports suggest that many plans and issuers still struggle to produce sufficient comparative analyses and to justify the way their mental health limitations operate in practice. The 2025 Report to Congress is one of the clearest recent examples.
Final Takeaway
The biggest mental-health-parity mistake is often assuming the denial speaks for itself. In many cases, the real issue is not only what the plan decided, but how it decided it, what standard it used, what medical comparator it chose, and whether the same rule exists on the medical/surgical side at all.
If a claimant focuses only on medical necessity, overlooks NQTLs, skips document requests, or misses the chance to build the record, stronger arguments can get left on the table. In similar situations, some people find it helpful to work with counsel who can evaluate the denial using objective criteria, plan language, and parity-specific evidence rather than just the insurer’s summary of events.
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