Behavioral Health Prior Authorization and Denial Guide

MBHO carve-out routing, ABA two-step authorization, level-of-care criteria by managed behavioral health organization, denial counter-arguments for CO-50, CO-96, CO-119, and CO-197, and MHPAEA parity appeal frameworks grounded in operative MBHO clinical criteria and federal statute. Behavioral health generates denial rates of 12–18% — the highest of any specialty — driven by medical necessity criteria variability, parity compliance failures, and the absence of standardized documentation benchmarks.

Level of care criteria: inpatient psychiatric admission, partial hospitalization programs (PHP, CPT H0035), and intensive outpatient programs (IOP, CPT H0015) all require prior authorization at most commercial payers. The LOCUS (Level of Care Utilization System) or ASAM criteria are used by most MBHOs as the clinical framework for inpatient and residential level of care determinations. Concurrent review at day 3–5 is standard for inpatient; appeals of non-certification decisions must be filed within the plan's appeal window, typically 60–180 days.

MHPAEA parity appeals: when a payer imposes prior authorization requirements or visit limits on behavioral health services that are more restrictive than those applied to analogous medical/surgical services, the plan violates MHPAEA (29 U.S.C. §1185a). Under CAA 2021 §203, members and providers can request the plan's Non-Quantitative Treatment Limitation comparative analysis. TMS (Transcranial Magnetic Stimulation, CPT 90867–90869) coverage varies significantly — most major commercial payers now cover TMS for treatment-resistant major depressive disorder with at least 2–4 failed antidepressant trials, but documentation requirements differ by payer.

• MHPAEA parity guide — detailed appeal arguments and enforcement tools
• All specialty guides
• Appeal Letter Builder — behavioral health and MHPAEA appeals