Physical Therapy CPT Codes: Billing Guidelines and Common Errors 2026

Physical therapy coding can become complicated when one visit includes an evaluation, exercise, manual therapy, gait training, and modalities. If the therapist selects the wrong code, calculates units incorrectly, or misses a required modifier, the payer may deny or reduce payment. This guide explains the most common physical therapy CPT codes, Medicare billing rules, documentation requirements, and errors to avoid in 2026.

TLDR: Physical Therapy CPT Codes at a Glance

• CPT codes 97161–97163 identify low-, moderate-, and high-complexity physical therapy evaluations.
• CPT 97164 applies to a qualifying physical therapy reevaluation.
• Common treatment codes include 97110, 97112, 97116, 97140, and 97530.
• Medicare applies the 8-minute rule to applicable timed services.
• The 2026 KX threshold is $2,480 for physical therapy and speech-language pathology services combined.
• Common modifiers include GP, KX, CQ, and 59.
• Medicare generally requires G0283 instead of 97014 for applicable unattended electrical stimulation.
• Coverage and billing rules can vary by payer.

What Are Physical Therapy CPT Codes?

Physical therapy CPT codes identify the evaluations, therapeutic procedures, tests, training, and modalities provided during a physical therapy encounter. The American Medical Association maintains the CPT code set, while individual payers determine coverage and payment policies.

CPT codes describe what the therapist performed. In contrast, ICD-10-CM codes explain the diagnosis, condition, symptom, or functional problem that supports medical necessity.

HCPCS Level II codes may also appear on a physical therapy claim. For example, Medicare uses G0283 for certain unattended electrical stimulation services.

There is no single CPT code for every physical therapy session. The therapist must select codes that match the services actually performed and documented.

Common Physical Therapy CPT Codes

The following table provides a quick reference for frequently used PT CPT codes.

These descriptions provide general guidance. The complete documentation, current code set, payer policy, setting, and scope-of-practice requirements determine whether a code applies.

Physical Therapy Evaluation CPT Codes

Physical therapy evaluation CPT codes include 97161, 97162, and 97163. Therapists choose among these codes according to the complexity supported by the completed evaluation.

The American Physical Therapy Association’s evaluation guidance identifies four major components: patient history, examination, clinical presentation, and clinical decision-making.

The time spent completing an evaluation does not independently determine its complexity level. The record must support the selected code through the applicable evaluation components.

CPT 97164: Physical Therapy Reevaluation

CPT 97164 applies when the therapist performs a medically necessary formal reevaluation. New clinical findings, an unexpected change in function, a significant improvement or decline, or failure to respond to the current treatment plan may support the service.

Do not report 97164 automatically for every progress note, recertification, or routine assessment. Continuous assessment forms part of ongoing treatment and does not always qualify as a separately billable reevaluation.

Common Physical Therapy Treatment Codes

CPT 97110: Therapeutic Exercise

CPT 97110 applies to therapeutic exercises intended to improve strength, endurance, flexibility, or range of motion. Documentation should identify the exercises, the functional problem being addressed, the skilled assistance provided, and the patient’s response.

CPT 97112: Neuromuscular Reeducation

CPT 97112 addresses movement, balance, coordination, posture, kinesthetic sense, and proprioception. The note should connect the intervention to a documented neuromuscular or functional deficit.

CPT 97116: Gait Training

CPT 97116 covers skilled gait-related interventions, including walking mechanics, weight shifting, stair negotiation, and assistive-device training. Document the distance, device, assistance level, safety concerns, and specific gait problem addressed.

CPT 97140: Manual Therapy

CPT 97140 applies to skilled manual techniques such as joint mobilization, manual traction, soft-tissue mobilization, and manual lymphatic drainage. The record should identify the technique, treated region, clinical purpose, time, and patient response.

CPT 97530: Therapeutic Activities

CPT 97530 covers dynamic activities designed to improve functional performance. Examples may include lifting, reaching, carrying, transfers, or activities that simulate work and daily tasks.

The therapist should not choose between 97110 and 97530 according to reimbursement. CPT 97110 focuses on developing physical capacities such as strength or range of motion, while 97530 focuses on functional, dynamic activities.

Other Treatment and Training Codes

CPT 97113 applies to aquatic therapy, while 97535 covers self-care and home-management training. Code 97750 may apply to a separate physical performance test when the service includes the required measurement and written report.

Do not report 97750 as an untimed code. Also, do not use it for routine measurements that already form part of an initial evaluation.

Physical Therapy Modality Codes

Common modality codes include:

• 97010 for hot or cold packs
• 97012 for mechanical traction
• 97014 for unattended electrical stimulation
• 97016 for vasopneumatic treatment
• 97032 for attended electrical stimulation
• 97035 for therapeutic ultrasound
• G0283 for applicable Medicare unattended electrical stimulation

Codes such as 97010, 97012, 97014, and 97016 generally represent supervised, untimed modalities. In contrast, 97032 and 97035 require constant attendance and use 15-minute units.

Medicare does not recognize CPT 97014 on its fee schedule for applicable unattended electrical stimulation. The CMS outpatient therapy billing guidance directs providers to G0283 for qualifying non-wound electrical stimulation under a therapy plan of care.

Timed vs Untimed Physical Therapy CPT Codes

Timed codes use units based on qualifying skilled treatment minutes. Therapists should document the minutes provided for each timed service and the total timed treatment minutes.

Untimed services usually allow one unit per encounter, regardless of duration. Evaluation codes, group therapy, and several supervised modalities fall within this category.

Medicare 8-Minute Rule

Medicare uses the following calculation for applicable timed physical therapy services:

First, total the qualifying timed-code minutes for the discipline on the date of service. Next, determine the total number of supported units and allocate those units among the services according to the minutes provided.

For example, a therapist provides 20 minutes of 97110 and 12 minutes of 97140. The 32 total timed minutes support two Medicare units. The documented minutes support one unit of 97110 and one unit of 97140.

Do not include evaluation time, untimed modalities, rest periods, waiting time, or unrelated administrative work in the timed-code total. Commercial payers may use different calculation methods, so verify each payer’s policy.

Physical Therapy Modifiers and 2026 Medicare Rules

GP Modifier

Modifier GP identifies services delivered under an outpatient physical therapy plan of care. Medicare requires it on applicable PT claim lines.

KX Modifier

The KX modifier confirms that services above Medicare’s annual threshold remain medically necessary and that the record supports continued treatment. For 2026, the threshold is $2,480 for PT and SLP services combined.

Do not apply KX automatically. Review the patient’s accumulated expenses and confirm that the plan, goals, progress, and medical necessity support continued skilled care.

CQ Modifier

Modifier CQ identifies outpatient physical therapy services furnished in whole or in part by a physical therapist assistant when Medicare’s requirements apply. Medicare pays applicable CQ services at 85% of the otherwise applicable Part B amount.

CMS also applies a de minimis policy when a PT and PTA contribute to the same service. Practices should track provider-level minutes instead of adding CQ to every service involving a PTA.

Modifier 59

Modifier 59 may identify a distinct service when two procedures would otherwise trigger an edit. The documentation must demonstrate why the services were separate, such as different treatment regions or distinct clinical purposes.

Do not add Modifier 59 simply because the payer bundled two codes. First review the current NCCI edit, payer instructions, and whether a more specific modifier applies.

Additional 2026 Updates

According to the current CMS Therapy Services guidance, the targeted medical-review threshold remains $3,000. Exceeding this amount does not mean every claim automatically receives a review.

Medicare also applies a 50% multiple procedure payment reduction to the practice-expense component of subsequent applicable therapy services. It does not reduce the entire payment for each additional code by 50%.

CMS added RTM codes 98979, 98984, and 98985 to the 2026 therapy code list. Current Medicare guidance also extends PT telehealth eligibility through December 31, 2027, although providers must still verify covered codes, place of service, and modifier requirements.

Physical Therapy Documentation Requirements

A strong physical therapy record should document:

• The condition and functional limitations
• Medical necessity for skilled care
• The applicable plan of care
• Measurable treatment goals
• Specific interventions performed
• Minutes for each timed procedure
• Total timed and total treatment time
• Assistance, cueing, progression, or clinical judgment
• The patient’s response and progress
• PT or PTA involvement
• Provider signature and date

A generic statement such as “patient completed exercises” may not support skilled therapy. Explain what the therapist did, why the intervention required clinical skill, and how it related to a functional goal.

Common Physical Therapy Billing Errors

Physical Therapy Coding Examples

Initial Evaluation With Treatment

A therapist performs a moderate-complexity evaluation and then provides 10 minutes of therapeutic exercise. The record may support one unit of 97162 and one unit of 97110.

Do not include the untimed evaluation minutes when calculating the timed treatment unit.

Multiple Timed Treatments

A therapist provides 18 minutes of therapeutic exercise, 13 minutes of manual therapy, and 10 minutes of gait training. The 41 total timed minutes support three Medicare units.

Allocate the units according to the time spent on each service and document every intervention, including any service that does not receive a separate unit.

Final Takeaway

Correct use of physical therapy CPT codes requires more than choosing a number from a list. Match every code and unit to the service, treatment time, evaluation complexity, medical necessity, provider involvement, documentation, and current payer requirements.

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