Physical Therapy Prior Authorization and Denial Guide
Visit limit thresholds, concurrent review criteria, and appeal frameworks for physical and occupational therapy services, grounded in Aetna CPB #0325, UHC CDG Rehabilitation, Cigna Medical Coverage Policy for Outpatient Rehabilitation, eviCore Rehabilitation criteria, and Medicare Benefit Policy Manual Chapter 15. Physical therapy denial rates average 10–15%, with medical necessity denials and visit-limit denials being the two most common categories.
Prior authorization requirements vary: Medicare does not require prior authorization for outpatient PT, but applies the KX modifier threshold ($2,330 in 2024) above which documentation of medical necessity must be in the chart and the KX modifier must be appended to indicate the therapy is medically necessary beyond the threshold. Most commercial payers require PA for PT episodes exceeding a specified visit count (typically 12–20 visits), and concurrent review at that threshold to extend coverage. Functional outcome documentation — using standardized outcome measures such as FOTO, OPTIMAL, or payer-specific functional assessment tools — is required by most payers to justify continued care.
Concurrent review appeals: when a payer terminates PT coverage during an authorized episode, the concurrent review denial is typically based on a determination that the patient has reached a functional plateau. The appeal must document measurable functional progress since the last visit (using objective measures — range of motion, strength testing, functional scales) and identify the specific functional goal that remains unmet. MHPAEA arguments are sometimes applicable when a payer applies more stringent concurrent review criteria to PT for mental health diagnoses than to PT for musculoskeletal diagnoses in the same classification.