Parity does not require plans to cover behavioral health. It requires that whatever they cover not be limited more heavily than medical care.
The Paul Wellstone and Pete Domenici Mental Health Parity and Addiction Equity Act of 2008 “generally prevents group health plans and health insurance issuers that provide mental health or substance use disorder (MH/SUD) benefits from imposing less favorable benefit limitations on those benefits than on medical/surgical benefits.”
Reading that sentence carefully is the whole lesson.
What parity does and does not do
MHPAEA “generally provides that financial requirements (such as coinsurance and copays) and treatment limitations (such as visit limits) imposed on MH/SUD benefits cannot be more restrictive than the predominant financial requirements and treatment limitations that apply to substantially all medical/surgical benefits in a classification.” It also “prohibits separate financial requirements and treatment limitations that apply only to MH/SUD benefits.”
But the law “does NOT require group health plans or health insurance issuers to cover MH/SUD benefits.” The coverage requirement comes from elsewhere: the Affordable Care Act “requires coverage of mental health and substance use disorder services as one of ten essential health benefit (EHB) categories in non-grandfathered individual and small group plans.”
Parity is a comparison rule, not a coverage mandate. A plan that covers no behavioral health at all is not violating parity.
The two kinds of limitation
Quantitative limits are countable: copays, coinsurance, deductibles, visit limits, day limits. Comparing them across behavioral and medical benefits is arithmetic, and this is where the 2008 law had its clearest early effect.
Nonquantitative treatment limitations are the ones that matter now. These are the operational restrictions that do not appear as a number in a benefit summary. Examples named in federal regulation include “prior authorization requirements and other medical management techniques, standards related to network composition, and methodologies to determine out-of-network reimbursement rates.”
NQTLs are where unequal access actually lives. A plan can match every copay exactly while requiring prior authorization for behavioral services it does not require for comparable medical services, or paying behavioral providers rates that keep them out of network.
The comparative analysis requirement
The Consolidated Appropriations Act, 2021 addressed this. Section 203 amended MHPAEA “by expressly requiring group health plans and health insurance issuers offering group or individual health insurance coverage that offer both medical/surgical benefits and MH/SUD benefits and that impose non-quantitative treatment limitations (NQTLs) on MH/SUD benefits to perform and document their comparative analyses of the design and application of NQTLs.” Beginning 45 days after enactment, plans “must make their comparative analyses available to the Departments or applicable State authorities, upon request.”
The employer course covered how the same statute created fiduciary and transparency obligations. This is the behavioral health provision of the same law, and it works the same way: it does not prohibit any specific practice, it requires the plan to be able to show its work.
Worth remembering: parity has been law since 2008 and the access gap persists, which tells you something about what a comparison rule can accomplish. Requiring behavioral limits to match medical limits assumes the medical baseline is adequate and that the binding constraint is plan design. Where the constraint is instead that clinicians will not join networks at offered rates, a parity requirement addresses it only indirectly, by making network composition itself comparable. That indirect route is what the 2021 and 2024 provisions were reaching for, and the next lesson covers how far they got.
Key takeaways
- MHPAEA requires that behavioral limits be no more restrictive than medical ones; it does not require coverage.
- The ACA separately mandates behavioral coverage as an essential health benefit in certain markets.
- Nonquantitative treatment limitations, including prior authorization, network composition, and out-of-network rate methodology, are where unequal access resides.
- The Consolidated Appropriations Act, 2021 requires plans to perform, document, and produce comparative analyses of their NQTLs.
Sources
Check your understanding
Does MHPAEA require health plans to cover mental health and substance use disorder benefits?
MHPAEA does not require group health plans or issuers to cover behavioral benefits at all. The ACA separately requires coverage as one of ten essential health benefit categories in non-grandfathered individual and small group plans.