Physical Therapy Medical Billing Services
Physical therapy is billed in timed units, which makes it one of the most audit-exposed specialties there is. The unit count has to follow from documented treatment minutes, and if it does not, the claim is indefensible however good the care was.
Codes this specialty bills most
| Code | Description | Watch for |
|---|---|---|
| 97110 | Therapeutic exercise to develop strength, endurance, range of motion and flexibility | Timed, 15 minute units. The most commonly billed and most commonly audited PT code. |
| 97140 | Manual therapy techniques, one or more regions | Frequently bundled with 97530 without a modifier. |
| 97530 | Therapeutic activities, direct patient contact, to improve functional performance | Distinct from 97110. The documentation has to show why both were needed. |
| 97164 | Physical therapy re-evaluation, established plan of care | Requires a documented change in status. Routine progress notes do not qualify. |
The denials this specialty sees
Unit arithmetic is the first thing an auditor checks. Under the 8 minute rule, total timed treatment minutes determine how many units can be billed, and the note has to record those minutes. A note describing the treatment without stating time cannot support the units, and the fact that the treatment happened is not the point.
The second pattern is modifier 59 on bundled pairs. 97140 with 97530 is the classic example. The modifier is legitimate when the services were separate and distinct, but applying it as a default on every claim is exactly the pattern that triggers review. See CO-97.
Third is certification. Plans of care require physician certification within a defined window, and claims for treatment provided outside a certified plan deny. This is administrative rather than clinical, which is why it gets dropped when a clinic is busy.
Our billing service checks unit arithmetic against documented minutes before submission, because after a denial there is nothing left to argue with.
Payer notes
Medicare therapy thresholds require the KX modifier once a patient's annual spend passes the limit, along with documentation that continued care is medically necessary.
Commercial visit limits are common and are frequently tracked by the payer rather than communicated. Verify the remaining visit count during eligibility rather than assuming.
Common questions
How does the 8 minute rule work?
Total timed treatment minutes determine billable units. Eight to twenty two minutes supports one unit, twenty three to thirty seven supports two, and so on. The documented minutes have to support the arithmetic, so the minutes need to be in the note.
When should we use modifier 59?
When the services were genuinely separate and distinct, and the note says how. Medicare prefers the X modifiers where they apply. Using 59 on every claim with a bundled pair is a reliable way to be selected for review.
What happens if the plan of care is not certified in time?
Claims for treatment outside a certified plan deny, and appealing on clinical grounds does not help because the objection is administrative. Track certification dates as part of scheduling.
See what your claims are leaving behind
Send us a month of remittance data and we will tell you what it says: which codes are being denied, how much of it is recoverable, and how long your money is sitting in A/R. It takes about a week and there is nothing to sign.