Direct answer: Physical therapy billing and coding in 2026 requires accurate CPT codes, ICD-10-CM diagnoses, timed units, modifiers, and clinical documentation. Medicare also requires a valid treatment plan. In addition, therapists must explain why each service requires professional skills. Medicare set the 2026 KX threshold at $2,480 for physical therapy and speech-language pathology combined.
Last reviewed: August 2026. This guide provides general billing information. Always follow current CMS, Medicare contractor, payer, coding, clinical, and legal guidance.
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What Is Physical Therapy Billing and Coding?
Physical therapy billing converts clinical services into insurance claims. Physical therapists document the patient’s condition, treatment, progress, and functional goals. Then, billing teams translate that information into codes, units, and modifiers.
A clean claim should explain:
- Why the patient needs skilled physical therapy
- Which functional limitations affect the patient
- Which interventions the therapist provided
- How much direct treatment time the therapist spent
- Who performed each service
- Whether the payer authorized the treatment
However, every payer maintains its own requirements. Medicare rules provide a useful framework. Still, clinics should verify Medicaid, Medicare Advantage, and commercial-plan policies separately.
Physical Therapy Revenue-Cycle Workflow
A successful billing process starts before the first appointment. Therefore, clinics should create a consistent workflow.
- Verify eligibility: Confirm active coverage for the treatment date.
- Review benefits: Check copayments, coinsurance, deductibles, exclusions, and visit limits.
- Obtain authorization: Determine whether the payer requires approval before evaluation or treatment.
- Confirm provider status: Review enrollment, credentialing, taxonomy, and network participation.
- Complete the evaluation: Record objective findings, limitations, goals, and planned treatment.
- Complete plan approval: Meet the payer’s certification requirements.
- Document every visit: Record skilled interventions, treatment time, response, and progress.
- Code the services: Assign supported CPT codes, diagnoses, units, and modifiers.
- Submit and monitor claims: Review claim acceptance, payments, and denials.
Medicare Plan-of-Care Requirements
Medicare requires therapists to provide outpatient therapy under a written plan of care. The patient must also remain under a physician’s or qualifying practitioner’s care.
The plan should include:
- The patient’s diagnoses
- Long-term treatment goals
- The type of therapy
- The planned amount of therapy
- The treatment frequency
- The expected duration
Generally, a physician or nonphysician practitioner must certify the initial plan within 30 calendar days. The period starts on the first treatment day, including the evaluation.
A practitioner may also provide a qualifying verbal order. In that situation, the practitioner must sign and date the verbal order within CMS’s required timeframe.
Initial Plan Signature Exception
Starting in 2025, Medicare added an exception for certain therapist-established initial plans. A signed and dated order or referral may satisfy the initial signature requirement when the case meets every CMS condition.
For example, the record must show that the therapist delivered the plan to the practitioner within 30 calendar days. The order must also identify the patient, practitioner, and required therapy type.
This exception does not cover recertifications. It also does not apply to Comprehensive Outpatient Rehabilitation Facility plans.
Recertification
The physician or practitioner should recertify the plan when the therapist makes a significant change. Otherwise, Medicare generally requires recertification at least every 90 calendar days.
Common Physical Therapy CPT Codes
| Code | General use | Billing type |
|---|---|---|
| 97161 | Low-complexity physical therapy evaluation | Untimed |
| 97162 | Moderate-complexity physical therapy evaluation | Untimed |
| 97163 | High-complexity physical therapy evaluation | Untimed |
| 97164 | Physical therapy reevaluation | Untimed |
| 97110 | Therapeutic exercises | Timed, each 15 minutes |
| 97112 | Neuromuscular reeducation | Timed, each 15 minutes |
| 97116 | Gait-training therapy | Timed, each 15 minutes |
| 97140 | Manual therapy techniques | Timed, each 15 minutes |
| 97530 | Therapeutic activities | Timed, each 15 minutes |
| 97535 | Self-care or home-management training | Timed, each 15 minutes |
| 97150 | Group therapeutic procedures | Untimed |
These descriptions provide a general reference. Before billing, confirm the complete CPT description and current payer policy. Also, review NCCI edits and documentation requirements.
Timed and Untimed Physical Therapy Codes
Untimed codes generally allow one unit per encounter. For example, Medicare treats therapy evaluations and group therapy as untimed services.
In contrast, many treatment codes use 15-minute units. Medicare calculates the allowable units from the total timed treatment minutes for each discipline and treatment date.
How Medicare’s Eight-Minute Rule Works
First, add all direct treatment minutes for the timed services. Next, use the following table to determine the maximum units:
| Total timed treatment minutes | Maximum units |
|---|---|
| 1–7 minutes | 0 units |
| 8–22 minutes | 1 unit |
| 23–37 minutes | 2 units |
| 38–52 minutes | 3 units |
| 53–67 minutes | 4 units |
| 68–82 minutes | 5 units |
| 83–97 minutes | 6 units |
| 98–112 minutes | 7 units |
| 113–127 minutes | 8 units |
After that, allocate the units among the individual services. Use the documented minutes for each intervention. Do not assign every unit to the code with the highest payment.
Additionally, do not apply Medicare’s rule to every insurance plan. Some payers use a different calculation method. Always check the patient’s policy.
Timed-Unit Calculation Example
Assume a Medicare patient receives:
- 20 minutes of therapeutic exercise
- 18 minutes of manual therapy
- 15 minutes of therapeutic activities
The therapist provided 53 timed minutes. Therefore, the session supports four timed units under Medicare’s table.
Each intervention contains at least one full 15-minute block. The billing team should assign the fourth unit according to Medicare’s remaining-minute rules.
Finally, the treatment note should support all 53 minutes and every reported service.
Important Physical Therapy Modifiers
| Modifier | Purpose |
|---|---|
| GP | Identifies services under an outpatient physical therapy plan |
| KX | Confirms that the record supports necessary therapy at or above the applicable threshold |
| CQ | Identifies applicable services that a physical therapist assistant furnished |
| 59 | Identifies a distinct procedural service when the record supports separate reporting |
| XE, XP, XS, XU | Provide more specific information than modifier 59 |
| GA | Shows that the provider issued a required Advance Beneficiary Notice |
Modifiers explain a claim circumstance. Therefore, billers should add them only when the documentation supports their use.
For more information, read our guide to common medical billing modifiers.
The 2026 Medicare KX Threshold
Medicare set the 2026 KX threshold at $2,480 for physical therapy and speech-language pathology combined. Medicare also uses a separate $2,480 threshold for occupational therapy.
The threshold does not end coverage. Instead, it requires the provider to confirm continued medical necessity.
When the patient reaches the threshold, review the record before adding KX. The documentation should explain why the patient still needs skilled treatment.
CMS actively reviews therapy claims that include KX. As a result, clinics should never add the modifier automatically based only on accumulated charges.
How to Bill Physical Therapist Assistant Services
Medicare uses modifier CQ for applicable outpatient physical therapy services that a PTA provides. When CQ applies, the claim must also include GP.
Medicare pays 85% of the otherwise applicable Part B amount for services that meet the CQ criteria.
However, CMS applies a de minimis standard. This standard considers the portion of the service that the PTA provided independently. CMS also maintains special rules for certain shared-service situations.
Therefore, do not add CQ to every visit that involves a PTA. Instead, calculate the therapist and assistant minutes by using current CMS examples.
The treatment note should identify each professional’s work. It should also record the time that each person spent on the service.
Modifier 59 and NCCI Edits
NCCI edits prevent improper reporting of some code combinations. However, a clinic may separately report distinct services when the circumstances meet the applicable rules.
Modifier 59 or an appropriate X modifier may explain those circumstances. Still, a different diagnosis alone may not prove that the services were distinct.
Before using modifier 59:
- Check the current NCCI edit.
- Confirm that CMS or the payer allows a modifier.
- Verify that the therapist provided genuinely distinct services.
- Document the separate circumstances.
- Use a more specific X modifier when the payer requests one.
For example, the record may show separate anatomical areas or nonoverlapping treatment intervals. The documentation must clearly explain the difference.
Physical Therapy Diagnosis Coding
ICD-10-CM codes explain the patient’s conditions, impairments, symptoms, and functional limitations. Therefore, choose the most specific code that the medical record supports.
The diagnosis should align with:
- The referral or order
- The evaluation findings
- The treatment plan
- The interventions
- The functional goals
Do not add an unsupported diagnosis to obtain authorization or payment. Instead, ask the appropriate clinician to clarify incomplete or conflicting information.
Documentation for Physical Therapy Claims
CMS identifies insufficient documentation as a major cause of improper physical therapy payments. Consequently, clinics should maintain a complete record for every treatment episode.
The record commonly includes:
- An initial evaluation
- A written treatment plan
- Plan certification
- Progress reports
- Daily treatment notes
- Reevaluation documentation
- A discharge note
Initial Evaluation
The therapist should record the patient’s history, impairments, functional limitations, and objective measurements. In addition, the evaluation should include the clinical assessment, prognosis, goals, and planned interventions.
Daily Treatment Note
Each note should support the codes and units on the claim. Include the treatment date, interventions, clinical decisions, patient response, progress, and relevant time.
The treating professional should also sign and date the note according to payer and recordkeeping requirements.
Progress Report
The progress report should compare current objective findings with the original goals. It should also explain why the patient needs continued skilled care.
Medicare Can Cover Maintenance Therapy
Medicare does not base coverage only on the patient’s ability to improve. It may also cover skilled maintenance therapy.
For example, a patient may need a therapist’s skills to maintain function or slow deterioration. The therapist must explain why the patient, caregiver, or unskilled person cannot safely manage the service.
Therefore, clinics should not classify maintenance therapy as noncovered only because the patient has stopped improving.
Prior Authorization and Visit Limits
Many commercial plans, Medicare Advantage plans, and Medicaid programs require authorization. Some payers require approval before the evaluation. Others authorize a limited number of visits after the evaluation.
Track the following information:
- Authorization number
- Approved procedure codes
- Authorized visits or units
- Effective dates
- Required progress reports
- Reauthorization deadline
However, authorization does not guarantee payment. The claim must still meet eligibility, documentation, medical-necessity, coding, and filing requirements.
Common Physical Therapy Claim Denials
- Missing or expired authorization
- Incorrect patient or insurance information
- Provider enrollment or credentialing problems
- Missing GP, CQ, or KX modifier
- Unsupported modifier 59
- Incorrect timed-unit calculations
- Plan-of-care certification problems
- Weak medical-necessity documentation
- Diagnosis and treatment mismatch
- Exceeded visit limits
- Duplicate or bundled services
- Late claim submission
Fortunately, clinics can prevent many denials during registration and scheduling. Read our guide about reducing denials through eligibility verification.
Physical Therapy Claim Checklist
- Verify eligibility and therapy benefits.
- Confirm authorization and visit limits.
- Review provider enrollment and network status.
- Check the evaluation and treatment plan.
- Confirm plan certification.
- Validate the ICD-10-CM codes.
- Match each CPT code with the documented intervention.
- Calculate timed units under the payer’s rules.
- Apply modifiers only when the record supports them.
- Check current NCCI edits.
- Submit the claim before the payer’s deadline.
- Review acceptance reports and remittance advice.
Frequently Asked Questions
What Medicare therapy threshold applies in 2026?
Medicare uses a $2,480 KX threshold for physical therapy and speech-language pathology combined. The amount does not create a hard coverage cap.
What does modifier GP mean?
GP identifies a service under an outpatient physical therapy plan of care.
When should a provider use modifier CQ?
Use CQ when a PTA provides all or part of a service and the case meets CMS’s modifier requirements.
Does every payer use Medicare’s eight-minute rule?
No. Some payers use different methods. Therefore, verify the patient’s plan before calculating units.
Can Medicare cover maintenance physical therapy?
Yes. Medicare can cover skilled maintenance care when the patient needs a qualified therapist’s expertise.
Does prior authorization guarantee payment?
No. The claim must still meet every eligibility, coding, documentation, and filing requirement.
Official Medicare Resources
- CMS Therapy Services
- CMS 2026 KX Modifier Threshold
- CMS Therapy Documentation Requirements
- CMS CQ and CO Modifier Examples
- Medicare Claims Processing Manual, Chapter 5
Improve Your Physical Therapy Revenue Cycle
Physical therapy practices need close coordination between schedulers, therapists, billers, and authorization teams. Otherwise, one error can affect every visit in a treatment plan.
Med Billing and Transcription helps practices verify benefits, code claims, resolve denials, and manage accounts receivable. Contact our team to discuss physical therapy billing support.
