What Are the Most Common Physical Therapy CPT Codes?
The most common physical therapy CPT codes are 97110 (therapeutic exercise), 97140 (manual therapy), 97530 (therapeutic activities), 97112 (neuromuscular re-education), and the evaluation codes 97161 to 97163. Most PT visits use a mix of these. Picking the right one, and billing the right number of units, decides whether a claim is paid or denied.
This guide lists the PT CPT codes you will use most, what each one covers, and how to bill them correctly. You will also see the modifiers, unit rules, and documentation habits that prevent denials.
Quick Reference: Common PT CPT Codes at a Glance
Use this as a cheat sheet. “Timed” means you bill in 15-minute units. “Untimed” means one unit per visit, no matter how long it takes.
| CPT code | What it covers | Timed or untimed |
|---|---|---|
| 97161 | PT evaluation, low complexity | Untimed |
| 97162 | PT evaluation, moderate complexity | Untimed |
| 97163 | PT evaluation, high complexity | Untimed |
| 97164 | PT re-evaluation | Untimed |
| 97110 | Therapeutic exercise | Timed |
| 97112 | Neuromuscular re-education | Timed |
| 97116 | Gait training | Timed |
| 97140 | Manual therapy | Timed |
| 97530 | Therapeutic activities | Timed |
| 97535 | Self-care and home management training | Timed |
| 97032 | Electrical stimulation, attended | Timed |
| 97035 | Ultrasound | Timed |
| 97014 / G0283 | Electrical stimulation, unattended | Untimed |
| 97010 | Hot or cold packs | Untimed |
| 97150 | Group therapy | Untimed |
Code descriptions here are shortened. Always check the full descriptor in the current-year AMA CPT code book before you bill.
Which CPT Codes Are Used for a PT Evaluation?
A new patient visit starts with one of three evaluation codes. The right one depends on how complex the case is, not how long the visit lasts.
- 97161 (low complexity): A straightforward case with no personal factors or comorbidities that affect the plan of care, and a stable presentation. Typical time is about 20 minutes.
- 97162 (moderate complexity): One or two personal factors or comorbidities, and an evolving presentation. Typical time is about 30 minutes.
- 97163 (high complexity): Three or more personal factors or comorbidities, and an unstable presentation. Typical time is about 45 minutes.
The complexity level comes from the history, the exam, the clinical presentation, and the decision-making. Your note must show these four parts. If it does not, a payer can downcode the claim.
Use 97164 when you re-evaluate a patient who is already in care. A re-evaluation is not routine. It makes sense when there is a new clinical finding, a significant change in status, or a failure to respond to the current plan. Billing 97164 at every visit, or on a set schedule, is a common audit flag.
What Are the Most Common PT Treatment Codes?
These are the PT billing codes you will see on most claims. Most treatment codes are timed, so unit counts matter.
97110: Therapeutic Exercise
This is the most used code in outpatient PT. It covers exercises that build strength, endurance, range of motion, and flexibility, with one-on-one attention from the therapist. A patient doing a set of exercises alone while the therapist works with someone else does not count.
97140: Manual Therapy
This code covers hands-on techniques such as joint mobilization, manipulation, soft tissue mobilization, and manual traction. Document the technique, the body area, and the response. Payers often question 97140 when it appears with other codes, because of bundling edits (more on that below).
97530: Therapeutic Activities
Use this for dynamic, functional tasks that mimic daily life, such as lifting, stepping up onto a platform, or transfers. It is different from 97110. If you bill both on the same day, your note should show clearly different work for each.
97112: Neuromuscular Re-education
This covers balance, coordination, posture, and proprioception work. It is common for stroke recovery, vestibular problems, and post-surgical balance training.
97116: Gait Training
Use this when you teach or improve walking, including stair climbing and use of an assistive device. The note should say what you trained and why the patient needed it.
97535: Self-Care and Home Management Training
This applies when you train a patient in daily activities, such as safe bathing transfers or using adaptive equipment. It is also used for patient and caregiver training on home programs.
97032 and 97035: Attended Modalities
Both are timed. 97032 is attended electrical stimulation, where the therapist is in direct contact for the full time. 97035 is ultrasound. If the patient sits with a device running and the therapist is elsewhere, the service is not “attended.”
97014, G0283, 97010, and 97150: Untimed Codes
Unattended electrical stimulation is 97014 for most commercial payers. Medicare uses G0283 instead. Hot and cold packs (97010) are often bundled into other services and not paid separately. Medicare, for example, treats 97010 as a bundled service. Group therapy (97150) is billed once per patient in the group, and each patient must be doing therapeutic work, not just sharing a room.
How Do PT Units Work? The 8-Minute Rule Explained
Timed codes are billed in 15-minute units. For Medicare, the 8-minute rule tells you how many total units you can bill.
You add up all the minutes spent on timed codes, then match the total to a unit range:
| Total timed minutes | Units you can bill |
|---|---|
| 8 to 22 | 1 |
| 23 to 37 | 2 |
| 38 to 52 | 3 |
| 53 to 67 | 4 |
| 68 to 82 | 5 |
Untimed codes, such as evaluations, are not counted in the total.
A simple example
A therapist at a fictional 3-provider clinic treats a patient for 30 timed minutes:
- 20 minutes of therapeutic exercise (97110)
- 10 minutes of manual therapy (97140)
The total is 30 minutes, so the visit supports 2 units. 97110 takes one full unit with 5 minutes left over. 97140 has 10 minutes left over. The second unit goes to the code with the most remaining minutes, which is 97140. The claim shows 1 unit of 97110 and 1 unit of 97140.
Rules differ by payer. Medicare uses the 8-minute rule. Many commercial payers follow the AMA “substantial portion” rule instead, where each code needs at least 15 minutes for a full unit, or a unit is counted only when more than half of it is spent. Always check each payer’s policy.
Which Modifiers Do You Need on PT Claims?
Modifiers tell the payer more about the service. Missing or wrong modifiers are a top reason for PT denials.
- GP: Shows the service was delivered under a physical therapy plan of care. Medicare requires it on outpatient therapy claims.
- KX: Confirms the care is medically necessary once the patient passes the annual threshold amount. CMS sets the threshold each year and for 2025 it was $2,410 for PT and speech-language pathology combined. Check CMS for the current-year amount.
- CQ: Used when a physical therapist assistant (PTA) furnishes all or part of a service. Medicare pays 85% of the fee schedule amount for these services.
- 59 or the X modifiers (XE, XS, XP, XU): Show that two codes were separate and distinct services. They are used to get around National Correct Coding Initiative (NCCI) edits, but only when the documentation supports it. A common example is 97140 billed with 97530.
- GN and GO: These are for speech-language pathology and occupational therapy, not PT. Do not use them on PT claims.
Payer rules vary. Some commercial plans want different modifiers or ignore GP. Confirm with each payer before you submit.
What Causes PT CPT Code Denials?
Most PT denials trace back to a small set of mistakes.
- Wrong unit counts. Billing 4 units for a 45-minute timed session is an overbill. It is the easiest error for a payer to catch.
- Missing modifiers. Leaving off GP, KX, or CQ can lead to a rejection or a reduced payment.
- Bundling edits. NCCI edits stop some code pairs from being paid together. Adding modifier 59 without documentation to back it up invites an audit.
- Thin notes. If the record does not show time, technique, and patient response, the payer can deny the service.
- No plan of care or expired certification. Medicare requires a signed plan of care and recertification within set timeframes.
- Authorization and visit limits. Many commercial plans cap PT visits or require prior authorization. Claims over the limit are denied.
A practical example: a family-run PT clinic bills 97110, 97140, and 97530 on the same visit. The notes list “exercises and manual work” with no minutes per service. The payer asks for records, cannot match the units to the time, and recoups part of the payment. Writing minutes next to each code prevents that.
How Do You Choose the Right Code for the Service?
Match the code to what the therapist did, not to what pays best.
- Ask what the intervention was. Strengthening is 97110. A functional task is 97530. Balance and coordination work is 97112. Hands-on joint or soft tissue work is 97140.
- Check whether the therapist was directly involved for the full time. If not, the service may not qualify for a timed code.
- Record the minutes for each timed service.
- Link every code to a goal in the plan of care.
- Make sure the diagnosis codes (ICD-10) support the need for each service.
If two services look alike, the note should explain why they were different. A short line such as “stepping and lifting tasks to simulate work duties” helps a reviewer see why 97530 fits.
Do Dry Needling and Other Services Have PT Codes?
Dry needling is billed with 20560 or 20561, depending on the number of muscles treated. Whether PTs can bill these depends on state practice acts and payer policy. Many payers do not cover dry needling at all. Check state law and payer rules first, and tell the patient about any out-of-pocket cost before treatment.
Other services, such as orthotic management (97760) or physical performance tests (97750), have their own rules. If your clinic offers them, confirm coverage with the payer before you bill.
Keep Your PT Codes Current
CPT codes and payer rules change every year. CMS updates the Medicare Physician Fee Schedule each year and adjusts items such as the KX threshold. Review the new CPT code book each January, update your billing software, and brief your front desk and therapists on any changes.
Not sure where your PT claims are leaking revenue? Our billing team can review your last 90 days of claims and flag unit, modifier, and documentation errors. physical therapy billing services
