When does mental health parity apply?

Parity rules apply when:Your plan covers mental health or substance use disorder services (most employer plans and all ACA marketplace plans must).Your insurer denies, limits, or restricts mental health treatment.Your insurer imposes requirements — prior authorization, step therapy, higher cost-sharing — more restrictively for mental health than for medical/surgical care.You cannot find in-network mental health providers (the "ghost network" problem — listed providers who are not really accepting patients).What parity requires:Financial requirements. Copays, deductibles, and coinsurance for MH/SUD care cannot exceed what applies to medical/surgical care in the same classification (inpatient, outpatient, emergency, prescription drugs).Treatment limitations. Visit limits, prior auth, and other restrictions on MH/SUD care cannot be tighter than for comparable medical care.Non-quantitative treatment limitations (NQTLs). Prior auth, step therapy, network adequacy, medical necessity criteria — all have to be applied no more stringently to MH/SUD than to medical/surgical benefits. The 2024 rule made this comparative analysis more rigorous on paper.Three myths:"My plan does not have to cover mental health." All ACA marketplace plans and most employer plans must cover mental health as an essential health benefit. Small employer plans that do offer MH coverage have to comply with parity."Parity means unlimited therapy." No. Parity means the MH limits cannot be stricter than medical/surgical limits. If specialist visits are capped at 30 per year, therapy visits can be too."Insurer denied it, so it must not be covered." Many denials are themselves parity violations. If your plan covers comparable medical care without prior authorization but requires it for mental health, that is facially unequal.

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Mental Health Parity in Montana

Q: What should I do if my insurance company denied my mental health treatment claim?

Step 1: Request your plan's Summary of Benefits and Coverage (SBC) and compare MH/SUD benefits to medical/surgical benefits. Look for differences in copays, visit limits, prior authorization requirements, and network adequacy.Step 2: If your claim is denied, request the specific reason in writing. Ask: "Does the plan apply the same requirement to comparable medical/surgical benefits?" This is the parity question.Step 3: File an internal appeal with your insurer. Under the ACA, you have the right to appeal any denial. Cite the MHPAEA and request a comparative analysis showing how the limitation complies with parity.Step 4: If the internal appeal fails, request an external review through your state insurance department. An independent reviewer will assess whether the denial complies with parity requirements.Step 5: File a complaint with the DOL (for employer plans) at askebsa.dol.gov or call 1-866-444-3272, or with your state insurance department (for individual/marketplace plans). You can also contact CMS at 1-877-267-2323.

Q: What should you NOT do about mental health parity?

Don't accept a denial without questioning it. Mental health claim denials are frequently parity violations. The insurer must prove the denial meets parity standards if challenged.Don't assume your insurer is complying with parity. Federal and state enforcement agencies have found widespread parity violations across the industry. Scrutinize any limitation on mental health coverage.Don't give up after one appeal. External review is independent of the insurer and frequently reverses denials. You have nothing to lose by pursuing it.Don't wait for approval to get emergency mental health care. EMTALA requires screening and stabilization for psychiatric emergencies, and parity means emergency MH/SUD care must be covered on the same terms as medical emergencies.

Researched by Ahmed Alsaedi, Lead Engineer

Primary sources cited; not legal advice.

Source: Mental Health Parity and Addiction Equity Act (MHPAEA), 29 U.S.C. § 1185a (ERISA plans), 42 U.S.C. § 300gg-26 (individual/small group market). Affordable Care Act § 1311(j) — requires ACA marketplace plans to cover MH/SUD as an essential health benefit. MHPAEA Final Rule (2024), 29 C.F.R. Part 2590 — strengthened comparative analysis requirements (effective November 2024; as of May 2025 the DOL/HHS announced they will not enforce the 2024 rule pending D.C. Circuit litigation, but the rule has not been vacated). Enforced by DOL (employer plans), HHS (individual/marketplace plans), and state insurance departments.

About this article

Sourced from primary statutes (U.S. Code, CFR, state compiled statutes) and official government agency guidance. Written in plain language for general understanding — this is educational content, not legal advice. Our editorial standards

Montana Law

How Montana differs from federal law

Montana provides mental health parity protections through state insurance mandates and federal law:

Montana mental health insurance mandates: Montana law requires health insurance plans to cover treatment for severe mental illness, including schizophrenia, bipolar disorder, major depressive disorder, and obsessive-compulsive disorder. Coverage must be comparable to medical/surgical benefits.
Federal MHPAEA applies: The federal Mental Health Parity and Addiction Equity Act requires group health plans that offer mental health benefits to provide them at the same level as medical/surgical benefits — same copays, deductibles, and visit limits.
Montana constitutional privacy: Montana's explicit constitutional right to privacy (Art. II, § 10) provides additional protections for mental health information beyond federal HIPAA requirements.
Mental health confidentiality (MCA § 53-21-166): Montana provides strong confidentiality protections for mental health treatment records, requiring specific patient consent for most disclosures.
Involuntary commitment protections: Montana Mental Health Code (MCA Title 53, Ch. 21) establishes due process protections for involuntary commitment, including the right to counsel, the right to a hearing, and strict criteria for commitment.
Substance use disorder coverage: Montana requires insurance plans to cover substance use disorder treatment. Medicaid expansion through the HELP Act has improved access to SUD treatment statewide.

Additional Steps in Montana

File parity complaints with the Montana Commissioner of Securities and Insurance (CSI) at (406) 444-2040 or csi.mt.gov. Contact NAMI Montana at namimt.org for resources. For a mental health crisis, call 988 (Suicide & Crisis Lifeline). Montana Legal Services: (406) 442-9830.

Relevant Law: Mont. Code Ann. § 33-22-706 (mental health insurance mandates), Mont. Code Ann. § 53-21-166 (mental health confidentiality), Montana Constitution Art. II, § 10 (privacy), Federal MHPAEA 29 U.S.C. § 1185a

Federal baseline: Mental Health Parity nationwide

What is this right?

The Mental Health Parity and Addiction Equity Act passed in 2008, after Senator Paul Wellstone's family and decades of advocacy by mental health organizations finally pushed it through. The basic rule: if a health plan covers mental health and substance use disorder benefits, those benefits have to be at least as generous as medical and surgical benefits — same copays, same deductibles, same visit limits, same prior authorization rules.

In practice that means your plan cannot charge higher copays for therapy than for a regular doctor visit, cannot impose stricter visit caps on mental health treatment, and cannot require prior authorization for mental health care if it doesn't require it for comparable medical care. Compliance has been spotty for years — regulator audits routinely find parity violations. The 2024 final rule strengthened the comparative-analysis requirement, though as of mid-2025 federal enforcement of that specific rule is on hold pending litigation.

When does it apply?

Parity rules apply when:

Your plan covers mental health or substance use disorder services (most employer plans and all ACA marketplace plans must).
Your insurer denies, limits, or restricts mental health treatment.
Your insurer imposes requirements — prior authorization, step therapy, higher cost-sharing — more restrictively for mental health than for medical/surgical care.
You cannot find in-network mental health providers (the "ghost network" problem — listed providers who are not really accepting patients).

What parity requires:

Financial requirements. Copays, deductibles, and coinsurance for MH/SUD care cannot exceed what applies to medical/surgical care in the same classification (inpatient, outpatient, emergency, prescription drugs).
Treatment limitations. Visit limits, prior auth, and other restrictions on MH/SUD care cannot be tighter than for comparable medical care.
Non-quantitative treatment limitations (NQTLs). Prior auth, step therapy, network adequacy, medical necessity criteria — all have to be applied no more stringently to MH/SUD than to medical/surgical benefits. The 2024 rule made this comparative analysis more rigorous on paper.

Three myths:

"My plan does not have to cover mental health." All ACA marketplace plans and most employer plans must cover mental health as an essential health benefit. Small employer plans that do offer MH coverage have to comply with parity.
"Parity means unlimited therapy." No. Parity means the MH limits cannot be stricter than medical/surgical limits. If specialist visits are capped at 30 per year, therapy visits can be too.
"Insurer denied it, so it must not be covered." Many denials are themselves parity violations. If your plan covers comparable medical care without prior authorization but requires it for mental health, that is facially unequal.

What to Do If Your Insurer Denies or Limits Mental Health Coverage

Step 1: Request your plan's Summary of Benefits and Coverage (SBC) and compare MH/SUD benefits to medical/surgical benefits. Look for differences in copays, visit limits, prior authorization requirements, and network adequacy.

Step 2: If your claim is denied, request the specific reason in writing. Ask: "Does the plan apply the same requirement to comparable medical/surgical benefits?" This is the parity question.

Step 3: File an internal appeal with your insurer. Under the ACA, you have the right to appeal any denial. Cite the MHPAEA and request a comparative analysis showing how the limitation complies with parity.

Step 4: If the internal appeal fails, request an external review through your state insurance department. An independent reviewer will assess whether the denial complies with parity requirements.

Step 5: File a complaint with the DOL (for employer plans) at askebsa.dol.gov or call 1-866-444-3272, or with your state insurance department (for individual/marketplace plans). You can also contact CMS at 1-877-267-2323.

What should you NOT do?

Don't accept a denial without questioning it. Mental health claim denials are frequently parity violations. The insurer must prove the denial meets parity standards if challenged.

Don't assume your insurer is complying with parity. Federal and state enforcement agencies have found widespread parity violations across the industry. Scrutinize any limitation on mental health coverage.

Don't give up after one appeal. External review is independent of the insurer and frequently reverses denials. You have nothing to lose by pursuing it.

Don't wait for approval to get emergency mental health care. EMTALA requires screening and stabilization for psychiatric emergencies, and parity means emergency MH/SUD care must be covered on the same terms as medical emergencies.

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Mental Health Parity in other states

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Montana

Federal

StatuteMHPAEA (ERISA), 29 U.S.C. § 1185a
Requires parity between mental health/SUD benefits and medical/surgical benefits in group plans.
StatuteMHPAEA (PHSA), 42 U.S.C. § 300gg-26
Extends parity requirements to individual and small-group market plans regulated under the PHSA.
Regulation29 C.F.R. § 2590.712 (parity regulations)
DOL implementing rule defining financial requirements and treatment limitations comparison.
Agency guidanceDOL EBSA — MHPAEA Resources
DOL portal for filing parity complaints and accessing comparative-analysis guidance.