The silent commercial cut

Commercial payers routinely pay behavioral health at rates far below what comparable medical specialties earn. New federal enforcement rules that took full effect in 2024 give practices a legitimate lever to push back. Most have not picked it up yet.

Here is a billing scenario that does not trigger an alert. A claim goes out for 90837 (individual psychotherapy, 60 minutes). The payer accepts it and posts payment. Everything looks clean. What the practice does not see: the payment posted at 14% below the contracted rate, and has been doing so for 18 months.

That is not a denial. It is not a rejection. Nothing in a standard billing workflow catches it, because the claim was technically paid. The alert systems watch for CO-4 (procedure not covered) and CO-97 (bundled service). An accepted-but-underpaid claim? That lands as revenue.

Picture a 22-clinician group practice in Georgia running a quarterly audit against its fee schedules. One of its three commercial payers had been posting 90837 payments at 14% below the contracted rate for 18 months. The payer's explanation, once the practice asked for an accounting, was a fee schedule upload error. The practice filed corrected claims and recovered $41,000. The billing software had flagged zero issues during those 18 months.

The structural context makes this predictable. In 2017, behavioral health office visits were 5.2 times more likely to be out-of-network (OON) than primary care visits, up from 2.8 times in 2013, per FAIR Health commercial claims data.^[1] For substance use disorder (SUD) inpatient care, the OON disparity reached 10.1 times the rate for comparable medical or surgical inpatient stays.^[1] The Department of Labor's (DOL) MHPAEA analysis found that primary care office visit reimbursement exceeded behavioral health office visit rates by more than 50% in 11 states and by 30 to 49% in 13 additional states in the same period.^[2]

That structural gap is exactly what MHPAEA, the Mental Health Parity and Addiction Equity Act, prohibits. A plan paying 130% of Medicare for cardiology but 90% of Medicare for psychotherapy may violate that standard. The obligation has existed since 2008; enforcement only sharpened in October 2024, when new non-quantitative treatment limitation (NQTL) analytical requirements took effect for group health plans. The window to file comparative analysis requests is open right now, and most practices have not used it.

The fix is monitoring, not litigation. Three numbers per payer, reviewed each quarter: denial rate, days-to-payment, and paid-vs-contracted rate per CPT (Current Procedural Terminology) code. The third number is the one most practices skip. When it dips below 100% without a corresponding ERA adjustment code, that claim is worth a look.