Procedure guidesBillSherpa · Updated 2026
Mental Health Billing — The Parity Law Violations Most Insurers Hope You Don't Notice
The Mental Health Parity and Addiction Equity Act (MHPAEA) requires insurers to cover mental health and substance use disorder treatment at the same level as physical health care. In practice, most insurers violate this law routinely — and they're counting on patients not knowing their rights. Here's how to identify parity violations, what they cost you, and how to fight back.
What the parity law actually requires
The Mental Health Parity and Addiction Equity Act 29 U.S.C. § 1185a, strengthened by the Consolidated Appropriations Act of 2021, prohibits health insurance plans from imposing more restrictive coverage requirements on mental health or substance use disorder benefits than they apply to comparable medical or surgical benefits.
This applies to:
- Financial requirements — deductibles, copays, coinsurance, and out-of-pocket limits
- Treatment limitations — day limits, visit limits, and prior authorization requirements
- Non-quantitative treatment limitations (NQTLs) — medical necessity criteria, step therapy requirements, network adequacy, reimbursement rates for out-of-network providers
What this means in practice: if your plan covers 60 physical therapy visits per year, it cannot limit mental health therapy to 30 visits. If your plan doesn't require prior authorization for a cardiologist visit, it cannot require prior authorization for a psychiatrist visit for a comparable condition.
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The most common parity violations
Visit limits on mental health therapy not applied to comparable physical care
MHPAEA · 29 U.S.C. § 1185a
A plan that limits mental health outpatient visits to 20 per year but imposes no visit limit on physical therapy is a parity violation. If your insurer has denied mental health claims due to visit limits, request a comparison of how the same limit is applied to comparable medical/surgical benefits. This comparison — called a parity analysis — can be requested from your insurer and must be provided within 30 days under the CAA 2021.
Prior authorization required for mental health but not for equivalent medical services
MHPAEA non-quantitative treatment limitations
If your plan requires prior authorization for inpatient mental health treatment but not for comparable inpatient medical treatment (e.g., inpatient rehabilitation), that's a parity violation. Prior authorization requirements must be applied comparably across mental health and medical benefits.
Step therapy requirements for mental health drugs not applied to physical health drugs
MHPAEA step therapy rules
Step therapy (requiring you to try a less expensive treatment first) applied to mental health medications but not to comparable physical health medications is a parity violation. If your insurer requires you to "fail first" on a generic antidepressant before approving a branded medication, but doesn't apply the same requirement to a comparable physical health drug category, that's not parity.
Higher cost-sharing for mental health services than for physical health services
Financial requirements parity
If your plan has a $20 copay for a primary care visit but a $50 copay for an equivalent mental health visit, that may be a parity violation. Cost-sharing for mental health must be comparable to cost-sharing for similar medical services.
Inadequate mental health provider network leading to out-of-network charges
Network adequacy parity
If your insurer's mental health network is so inadequate that you can't access in-network providers within a reasonable geographic distance or wait time, you may be entitled to in-network cost-sharing for out-of-network mental health care. Network adequacy requirements must apply comparably to mental health and medical/surgical benefits.
How to identify and fight parity violations
- Request your plan's parity analysis. Under the CAA 2021, you have the right to request a comparative analysis of non-quantitative treatment limitations. Your insurer must provide it within 30 days. This document shows how your plan applies each requirement to mental health versus comparable medical/surgical benefits.
- Compare mental health and physical health coverage side by side. Pull out your Summary of Benefits and Coverage (SBC) and your full plan document. Compare copays, deductibles, visit limits, and prior authorization requirements for mental health versus medical/surgical benefits at each level of care.
- Document denied claims. Keep records of every mental health claim denial — the date, the reason code, the service denied, and the provider. These denials become the basis of your parity complaint.
- File an internal appeal. When a mental health claim is denied, always appeal. Cite the MHPAEA and the specific way the denial treats mental health differently from a comparable physical health service. Ask your insurer to explain how the denial is consistent with parity requirements.
- File a complaint with the Department of Labor. For employer-sponsored plans, the DOL enforces MHPAEA. File a complaint at dol.gov/agencies/ebsa. For individual or marketplace plans, file with your state insurance commissioner and with HHS.
- File with your state insurance commissioner. Many states have their own parity laws that are stronger than federal requirements. Your state insurance commissioner enforces both state and federal parity requirements.
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What parity violations cost you — and what recovery looks like
Parity violations can mean thousands of dollars in denied claims, excess cost-sharing, and out-of-network expenses incurred because the in-network network was inadequate. When parity violations are identified and reported:
- Insurers may be required to retroactively reprocess denied claims and pay the difference
- Ongoing prior authorization requirements may be removed
- Visit limits may be increased or eliminated
- Regulators may impose fines on the insurer
Mental health billing checklist
- Compare mental health copays and deductibles to equivalent physical health services
- Check whether mental health has visit limits that don't apply to comparable physical care
- Document any prior authorization requirements that apply to mental health but not to comparable medical services
- Request the plan's parity analysis if a mental health claim is denied
- File internal appeals on every denied mental health claim citing MHPAEA
- Report suspected parity violations to DOL (employer plans) or state insurance commissioner
- Check whether inadequate network entitles you to in-network rates for out-of-network mental health care
Frequently asked questions
My insurer says my mental health treatment wasn't "medically necessary." Is this a parity violation?
It may be. The criteria for medical necessity determinations must be comparable between mental health and medical/surgical benefits. If your insurer uses stricter medical necessity criteria for mental health than for similar physical conditions, that's a non-quantitative treatment limitation parity violation. Request the specific criteria used for the mental health denial and compare them to the criteria applied to a comparable medical denial.
My therapist is out of network because there are no in-network therapists available. Can I get in-network rates?
Possibly. If your insurer's mental health network is inadequate — meaning you can't access in-network care within a reasonable timeframe or geographic distance — you may qualify for an "out-of-network exception" at in-network rates. Request a network adequacy report from your insurer and ask whether single-case agreements with out-of-network providers are available.
Can I be retroactively reimbursed for years of parity violations?
In some cases, yes. When parity violations are documented, insurers can be required to reprocess previously denied claims and reimburse the difference between what you paid and what you should have paid under proper parity application. The look-back period varies, but significant recoveries are possible — particularly for patients who've been in ongoing mental health treatment with substantial denied claims.