Physical Therapy Billing Services

Physical therapy billing runs on time: most treatment codes bill in 15-minute units governed by the 8-minute rule (for Medicare and payers following it), making the daily note’s minutes the claim’s foundation. Above the visit sit structural requirements — physician-certified plans of care with recertification clocks, annual therapy thresholds with modifier requirements, commercial visit caps, and authorization blocks measured in visits.

Our PT billing keeps the structure current: units calculated correctly from documented minutes, certifications and recertifications chased before they lapse, visit counts tracked against caps and authorizations in real time, and threshold modifiers applied when totals cross the lines.

Why Physical Therapy Billing Is Complex

Unit errors compound silently: a clinic miscounting timed units by one unit per few visits loses or overbills thousands monthly at PT volumes — and both directions are problems. The certification chain (initial plan signed, recertifications on schedule) is pure administration, but a lapsed certification makes covered care non-covered retroactively. Assistant-provided services now carry payment differentials with required modifiers under Medicare, adding a staffing dimension to claim construction.

Common Service Categories We Bill

• Therapeutic exercise and activity programs
• Manual therapy services
• Modalities (supervised and constant attendance)
• Evaluations and re-evaluations by complexity
• Post-surgical rehabilitation protocols

Common Denial Causes in Physical Therapy

• Unit-count edits against documented minutes
• Uncertified or lapsed plan-of-care periods
• Visit-cap and authorization exhaustion
• Threshold claims missing required modifiers

Documentation Risks to Watch

• Treatment minutes not documented per service per day
• Plan-of-care certifications and recerts lapsing unnoticed
• Assistant-versus-therapist service attribution unclear

Coding Considerations

• The 8-minute rule aggregates timed minutes across services — daily unit math must follow the payer’s counting method, which differs between Medicare and some commercial plans
• Assistant-provided care requires payment-differential modifiers for Medicare and payers adopting its rules

Typical Payer Challenges

• Authorization blocks in visits with utilization review on extensions
• Annual threshold tracking with medical-necessity documentation above the lines