Every dollar a physical therapy practice collects travels the same path: from the moment a patient calls, through the visit and the claim, to the payment that lands in your bank account. When one step is skipped or rushed, the problem rarely shows up right away. It shows up weeks later as a denial, a write-off, or a confused family.
This guide walks through each stage of physical therapy billing, the codes you will use most, the places PT billing goes wrong, and a checklist you can print and post at the front desk. It is written for owners and managers of outpatient PT private practices.
Nine stages, each with a habit that protects the revenue it generates.
Outpatient PT billing runs on a small, stable code set: the three evaluation complexity levels and the re-evaluation, the timed treatment codes for therapeutic exercise, neuromuscular re-education, gait training, manual therapy and therapeutic activities, the group code, and the orthotic management codes. Two are worth singling out. 97140 and 97530 are paired under NCCI edits, so billing both on the same date needs documentation showing distinct time and purpose. And Medicare, along with most plans that follow it, wants G0283 rather than 97014 for unattended electrical stimulation. The full code list with billing notes for each is in the downloadable guide.
Timed codes are billed in 15-minute units, but a unit does not require a full 15 minutes. Medicare totals the timed minutes across all timed codes in the session and divides, using an 8-minute threshold: 8 to 22 minutes is one unit, 23 to 37 is two, 38 to 52 is three, and so on.
The complication is that not every payer counts the same way. Some commercial plans apply the threshold to each code separately rather than to the session total, which can produce a different unit count from the same treatment. Billing the Medicare way for a payer that counts per code, or the reverse, produces denials or overpayments that are hard to spot because nothing on the claim looks wrong.
Know which method each payer uses, and document minutes per code rather than a single session total. Minutes recorded per code let you bill either way; a session total does not.
Two rules catch practices out more than any others. The first is that direct access is not the same as direct payment: your state may let a patient see you without a referral, but many plans still require a referral or a physician-signed plan of care before they will pay the claim. The second is the Medicare therapy threshold, which physical therapy shares with speech-language pathology. A patient receiving both reaches it faster than most owners expect, and the KX modifier has to go on from that point.
Beyond those, Medicare requires a certified plan of care with recertification at least every 90 days, and those dates deserve the same tracking you give authorizations. Append GP to physical therapy services where the payer requires it, and CQ where a physical therapist assistant delivered part of the service. The downloadable guide lists each of these with the detail your billing team needs.
Most lost revenue in PT billing is not one large claim. It is the same handful of denials repeating, each one small enough to ignore and frequent enough to matter.
They are nearly always the same five: an authorization that was missing or had expired, units the documented minutes do not support, an NCCI pairing billed without a defensible modifier, a plan of care whose certification lapsed while claims kept going out, and claims that simply waited past timely filing. Four of those five are front-end problems that surface as back-end denials, which is why most of the checklist in the downloadable guide sits before the first visit. By the time a denial arrives, the cheapest moment to prevent it has already passed.
The downloadable guide ends with a tickable checklist covering what has to be true before the first visit, after the evaluation, on every visit and claim, and weekly and monthly, plus the PT-specific checks for referrals, plan of care recertification, G0283 and the GP and KX modifiers. Each box is a place revenue is commonly lost. It is formatted to print and post at the front desk, which is where it does its work.
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The nine stages above describe the full revenue cycle, not the scope of a billing company's core fee. At Wellness Works Management Partners, core billing runs from claim scrubbing and submission through payment posting, denial management, A/R follow-up and reporting. Intake, eligibility and benefits verification, prior authorization and patient billing calls stay with your front office unless you add our separately priced eligibility and authorization services.
Our W-2 team of coders, billers and auditors works claims daily inside your own system, so your data stays yours. See how our physical therapy billing services work for PT practices. Many billing companies chase the lowest-hanging fruit. We cut down the tree for you.
Medicare totals the timed minutes across all timed codes in a session and bills one unit for 8 to 22 minutes, two for 23 to 37, three for 38 to 52, and so on. Some commercial payers apply the threshold to each code separately instead, so confirm the method with each plan.
GP identifies services delivered under a physical therapy plan of care. KX is added once a patient passes the annual Medicare therapy threshold, and CQ identifies services furnished in whole or in part by a physical therapist assistant.
It depends on how quickly claims go out and how denials are worked. Claims submitted within a few days of the visit and denials worked daily typically collect most of their revenue within 30 days. Batched billing and weekly denial work push that out to 60 or 90 days.
Yes. Physical therapy and speech-language pathology share one annual KX-modifier threshold, while occupational therapy has its own. Patients receiving both PT and speech reach the threshold faster.
97140 is manual therapy and 97530 is therapeutic activities. They are paired under NCCI edits, so billing both on the same date requires documentation showing distinct time and purpose, and often a 59 or X-modifier.
If you are exploring whether your physical therapy billing is capturing everything it should, we are happy to look at it with you.
