90837 vs 90834 Downcoding — 2026 MHPAEA Parity Recovery
The 90837 (60-minute psychotherapy) → 90834 (45-minute psychotherapy) automatic downcoding is one of the most systematic MHPAEA parity violations in commercial BH billing. Every major payer does it. Every appeal has recoverable dollars.
The Downcoding Pattern
You bill 90837 for a documented 60-minute session. Payer auto-adjudicates to 90834 without reviewing your documentation. You lose the ~30% rate difference every session.
Why This Is a MHPAEA Parity Violation (2024 Final Rule)
Med/surg parallel: A cardiologist bills 30-min consult vs 60-min consult based on time. Payer accepts documented time. BH gets downcoded regardless of documented time. That’s a Non-Quantitative Treatment Limitation (NQTL) that violates parity.
Appeal Framework
- Cite 2024 MHPAEA Final Rule NQTL requirements
- Document actual session time (start/stop timestamps in EHR)
- Request payer’s parity compliance analysis
- Escalate to state DOI if payer denies without NQTL analysis
Recovery Benchmark
12-18% of BH commercial denials are MHPAEA parity-appealable. 90837 downcoding alone typically returns $80K-$200K/yr for multi-site BH practices.
Case Study
12-site BH $70M rev. MHPAEA parity alone: $184K in 90 days. $1.04M total case study.
Free 30-day 90837 audit · Pricing 4-8%
– KD, Revenant Care