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Mental Health Parity

The federal requirement that a health plan covering mental-health or substance-use treatment cover it on terms no more restrictive than its medical and surgical coverage - in dollars, in visit limits, and in the prior-authorisation and network rules that are harder to see.

Informational only - this is not legal advice. These definitions explain general legal vocabulary in plain English. They are not advice about your situation, reading them creates no attorney-client relationship, and the law differs from state to state and changes over time. For advice you can rely on, speak to a lawyer licensed in your state.

What it means

Parity law does not require a health plan to cover mental-health or substance-use-disorder treatment. What it requires is that a plan which does cover it - which, since the Affordable Care Act, includes nearly every individual and small-group plan - cover it on terms no more restrictive than the plan applies to medical and surgical care. That rule has three parts. Financial requirements - deductibles, copayments, coinsurance, out-of-pocket maximums - may be no more restrictive. Quantitative treatment limits - the number of visits or days covered - may be no more restrictive. And "non-quantitative" treatment limits - prior-authorisation rules, medical-necessity criteria, step-therapy requirements, network admission standards, provider reimbursement rates and the like - may be no more stringent, in how they are written and how they are applied, than the comparable limits on medical care.

The third part is where most violations are found. A plan that requires prior authorisation for every outpatient therapy session but for no outpatient medical visit, that reviews residential mental-health treatment for medical necessity more often than it reviews inpatient rehabilitation, or that pays mental-health providers so far below medical providers that few will join the network, is applying a limit unequally, and federal law now requires the plan to have a written comparative analysis showing that each such limit is applied at parity and to produce it on request. A plan's medical-necessity criteria for mental-health benefits must be made available to any participant who asks.

Enforcement is divided. Employer plans are enforced by the Department of Labor and, for non-federal government plans, by the Department of Health and Human Services; state-regulated insurance by state insurance regulators under state parity laws, many of which are broader. An individual whose claim was denied appeals it under the plan's ordinary process, and parity is an argument in that appeal, in an external review and in a civil action under ERISA for an employer plan. A denial that cites a limit not applied to medical care is the fact pattern to look for.

Where this comes from

The Mental Health Parity and Addiction Equity Act of 2008 amended ERISA (29 U.S.C. § 1185a), the Public Health Service Act (42 U.S.C. § 300gg-26) and the Internal Revenue Code (26 U.S.C. § 9812); the implementing rules are at 29 C.F.R. § 2590.712, 45 C.F.R. § 146.136 and 26 C.F.R. § 54.9812-1, with the non-quantitative treatment-limit comparative-analysis requirement added by the Consolidated Appropriations Act, 2021, at 29 U.S.C. § 1185a(a)(8), and revised in the 2024 final rules. The essential-health-benefit requirement that individual and small-group plans cover mental-health and substance-use treatment is 42 U.S.C. § 18022(b)(1)(E).

When people hire a lawyer for this

Ask the plan, in writing, for its medical-necessity criteria for the denied service and for the criteria it applies to the closest medical or surgical equivalent - the plan is required to provide both, and the comparison is the case. A lawyer who handles ERISA or insurance claims can tell from those documents whether a parity argument exists, and for a residential or intensive-outpatient denial, where the amounts are large, that review is worth paying for before the internal appeal is filed rather than after it is lost.

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Part of the LawyerLand plain-English legal glossary. Definitions are written from primary sources - statutes and court rules - and each entry states the authority it rests on, or says plainly when the doctrine is state law with no national rule.

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