Mental health parity denials
The federal Mental Health Parity and Addiction Equity Act (MHPAEA) requires plans to apply no more restrictive treatment limitations to mental health and substance-use disorder benefits than to comparable medical/surgical benefits. Many denials violate parity, often unintentionally, and these violations are a powerful reversal lever.
The rule that controls this: The Mental Health Parity and Addiction Equity Act (29 U.S.C. § 1185a; 45 C.F.R. § 146.136) requires the plan to produce its NQTL comparative analysis on demand.
Last reviewed 13 September 2026 · General information, not legal or medical advice · Apellica is not a law firm
What gets denied
- Residential mental health and SUD treatment
- Intensive outpatient (IOP) and partial hospitalization (PHP)
- Applied behavior analysis (ABA) for autism
- Eating disorder treatment
- Extended therapy session counts
- Inpatient psychiatric stays
Common denial reasons
- Plan applies a stricter medical-necessity standard than for surgical care
- Plan limits sessions / days without comparable medical limits
- Network-adequacy gap (no in-network MH providers)
- Plan uses non-evidence-based internal criteria (e.g. requiring failure of lower level of care)
How we approach the appeal
Request the plan's non-quantitative treatment limitation (NQTL) analysis under MHPAEA, federal law requires plans to produce it on demand. Compare the criteria used for the denied MH service against criteria for an analogous medical/surgical service. File parallel complaints with the U.S. Department of Labor (for ERISA plans) or the state DOI (for fully-insured plans). Cite Wit v. United Behavioral Health for behavioral level-of-care cases.
Internal appeal: 180 days. External review: typically 4 months from final internal denial. Parity violations can also be reported to DOL or state regulators at any time.
$2,000 - $200,000+
- · Denial letter
- · Plan's medical-necessity criteria for the denied service
- · Plan's medical-necessity criteria for an analogous medical/surgical service
- · Treating clinician's letter and treatment plan
- · Documentation of prior levels of care attempted (if applicable)
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MH parity denials by insurer
What each plan tends to cite, and the rule that controls it.
This page provides general information about appeal strategy. It is not legal advice. Outcomes depend on documentation, plan terms, and timing.