CPT Codes for Functional Capacity Testing: A Complete Billing Guide for Providers

A small coding mistake can turn a completed test into an unpaid claim. For healthcare providers, accurate billing matters just as much as the assessment itself. The primary CPT code for Functional Capacity Testing is 97750, but using the right code doesn’t guarantee payment.

Missing documentation, incorrect billing units, or payer restrictions can still lead to denials. This guide explains when to use 97750, how to bill it correctly, and how to avoid common claim denials.

What Is Functional Capacity Testing?

Functional capacity assessment is sometimes referred to as Functional Capacity Evaluation (FCE). This test gauges a patient’s functional capacity to undertake physical activities like lifting, carrying, walking, standing, pushing, and pulling.

Think of the example of a worker in the warehouse that has an injured back. While the worker may be able to walk without difficulties, he definitely won’t be able to lift any load. Here FCE can help determine these restrictions.

When Should a Provider Order Functional Capacity Testing?

Not every patient receiving physical therapy needs an FCE. The assessment should answer a specific clinical or functional question.

A provider might consider testing when:

• A need exists for an objective evaluation of physical capabilities prior to going back to work.
• There is uncertainty about the patient’s capabilities regarding lifting, carrying, or endurance after being injured at work.
• The treating professional will require more information in order to formulate a rehabilitation plan.
• The workers’ compensation case involves an evaluation of the present physical capabilities for work.
• A patient has progressed to a stage where a performance evaluation will help proceed further.

The reason matters. An employer’s request, an insurance form, or a patient’s preference alone doesn’t establish that a test meets the medical necessity requirements of a health insurance plan.

What CPT Code Is Used for Functional Capacity Testing?

For most separately reportable physical performance assessments, CPT 97750 is the code providers should evaluate first.

It covers structured physical performance tests or measurements, including functional capacity testing, when the service meets the code requirements and the provider produces a written report.

The code isn’t limited to workplace assessments. Other qualifying performance measurements may also fall under 97750, depending on the service performed and its clinical purpose.

CPT 97750: Physical Performance Test or Measurement

The most common mistake is assuming that any functional assessment qualifies for CPT 97750.

It doesn’t.

A therapist who checks a patient’s strength, range of motion, and basic mobility as part of a routine evaluation generally shouldn’t bill those measurements separately under 97750. The code addresses testing beyond the usual evaluation, with its own clinical purpose and supporting report.

CPT 97750 vs. Other Functional Assessment Codes

Functional performance testing overlaps with several rehabilitation services. That doesn’t make their billing codes interchangeable.

These codes describe different services. A functional capacity test that measures what a patient can currently do is not automatically the same as therapeutic activity intended to improve what the patient can do.

Is CPT 97755 an Alternative to 97750?

Usually, no.

CPT 97755 covers assistive technology evaluation, and this is different from physical performance evaluation.

An occupational therapist evaluating specific assistive technology devices for a patient who has significant functional impairment will be guided by CPT 97755. An occupational therapist evaluating lifting tolerance for work reintegration purposes will be guided by CPT 97750.

There should also be a report describing the assistive technology evaluation process and needs of the patient.

Are CPT 99455 and 99456 Functional Capacity Evaluation Codes?

Not directly. These codes relate to specific work-related or medical disability examinations, including circumstances that involve impairment or work-related evaluations.

A treating physician performing a qualifying impairment examination may need a different code from the therapist who performs physical performance testing.

Don’t select a code solely because the case involves workers’ compensation. Identify the actual service, the professional performing it, and the applicable payer requirements first.

How to Bill CPT 97750 for Functional Capacity Testing

CPT 97750 is a timed code. The bottom line here is that you cannot bill for more units than the actual time it takes to perform the service. This is where you can run into problems because your office may be doing long evaluations of functional capacity.

How Many Units of CPT 97750 Can You Bill?

For Medicare outpatient therapy services subject to its timed-code rules, the familiar eight-minute rule helps determine how many 15-minute units are supported.

These intervals show the computation of Medicare timed service when the minutes fall into one timed procedure only. In case more than one timed procedure takes place at the same visit, add up all the units of service first based on the Medicare combined timed code policy.

Commercial insurers and workers’ compensation programs may apply different requirements, including authorization conditions or limits on the duration of testing.

Functional Capacity Testing Billing Example

Suppose a physical therapist performs a structured functional capacity assessment for a patient recovering from a shoulder injury.

The visit consists of 38 minutes of qualified performance testing. In addition, the therapist is responsible for writing up the necessary written report.

Based on the Medicare timed code formula that applies, 38 qualifying minutes will yield three units of CPT 97750, provided that no other timed services impact the unit count.

Now consider a different situation.

The patient is in the clinic for 90 minutes, but 30 minutes are for registration and other non-billable tasks. Stating that there were 6 units performed because the patient was in the clinic for 90 minutes might lead to overstating the billable service.

Document exactly what occurred. Document the accurate time and make sure it is in line with the service documentation. Don’t assume administrative and reporting time as billable time without the support of the appropriate payer policy.

What Documentation Does CPT 97750 Require?

You may have used the right code but failed the case because the medical documentation does not show why the assessment is needed.

A brief note stating “FCE completed” tells the payer almost nothing. What did you measure? Why did the patient need those measurements? How will the findings affect clinical decisions?

CMS contractor guidance identifies several areas providers should document when reporting 97750.

1. Reason for Performing the Test

Start with the clinical problem.

In case your patient is unable to return back to work after having lumbar injuries, it is necessary to specify the functional limitations that need to be assessed. The reason for this should not be the employer’s requirements.

2. Specific Tests Performed

Identify the actual measurements rather than writing a general description.

Depending on the situation, you will have to provide information regarding lifting capability, carrying capability, repetition capability, walking tolerance, or standing tolerance.

The patient’s symptoms and safety limitations should also appear where relevant.

3. Objective Findings and Written Report

CPT 97750 requires a written report. Your documentation should include the measured findings and your clinical interpretation, not simply the names of tests performed.

Where appropriate, include quantified results, comparisons with relevant functional demands, performance limitations, and the patient’s response during testing.

4. Connection to Functional Activities

Measurements become more meaningful when you explain their practical effect.

A finding that the patient can lift a particular weight is useful. Explaining how that ability compares with their documented job demands gives the treating provider information that can guide a decision.

5. Impact on the Treatment Plan

State what the findings mean for the patient’s care.

Did the results support changes to rehabilitation goals? Did they identify limitations that require further treatment? Do they provide information for return-to-work recommendations?

A separate, signed report with clear conclusions can help establish the purpose and value of the assessment.

Medical Necessity: When Does Functional Capacity Testing Qualify for Coverage?

FCE can have clinical value even though it may not meet the criteria for reimbursement under a certain insurance benefit.

This is an important point to consider.

Some functional capacity evaluations may focus on the job, legal considerations, and disability insurance. Health insurance policies may treat these kinds of FCEs differently from medical rehabilitation FCEs.

Before scheduling an assessment, establish who requested it and who is responsible for payment.

Medicare Coverage Considerations

Medicare may consider qualifying physical performance testing under applicable outpatient therapy coverage rules. But CPT 97750 is not a blanket approval for every functional capacity evaluation.

The record needs to support a separately identifiable testing service, and the testing must meet the relevant coverage conditions. Routine measurements already included in a therapy evaluation do not become separately payable just because a clinic creates a report.

Workers’ Compensation Requirements

Workers’ compensation frequently involves questions about physical work capacity. Yet billing requirements differ across states and insurance arrangements.

One program may require authorization before testing. Another may impose a time limit or apply a particular fee schedule.

For example, state workers’ compensation rules have specifically addressed CPT 97750 for limited and full functional capacity evaluations, sometimes with separate duration restrictions. Such rules must be verified for the current state and date of service rather than applied nationwide.

Commercial Insurance Plans

Each commercial payer might also have additional criteria related to medical necessity, network providers, documentation, and preauthorization.

It is important to check whether the patient’s plan covers the service and whether any providers can report the information prior to conducting the extensive assessment.

An authorization, when required and issued, still doesn’t guarantee payment. The final claim must meet the payer’s remaining conditions.

ICD-10-CM Codes That May Be Associated With Functional Capacity Testing

CPT 97750 describes the testing procedure. An ICD-10-CM code explains the patient’s documented diagnosis or condition.

There isn’t one diagnosis code that automatically makes every functional capacity evaluation medically necessary.

Providers may encounter diagnoses such as:

ICD-10-CM code	Description
M54.50	Low back pain, unspecified
M25.511	Pain in right shoulder
M25.512	Pain in left shoulder
M25.561	Pain in right knee
M25.562	Pain in left knee
M62.81	Muscle weakness (generalized)
R26.2	Difficulty in walking, not elsewhere classified
R26.89	Other abnormalities of gait and mobility
Z74.09	Other reduced mobility

These are examples, not a list of diagnoses that guarantee coverage for CPT 97750.

Use the code supported by the patient’s medical record, including any more specific diagnosis when available. For injuries, additional details such as laterality, encounter character, and injury circumstances may influence ICD-10-CM selection.

A generic pain code shouldn’t replace an established, more specific diagnosis simply because the practice believes the claim will process more easily.

Medicare Modifiers and Coding Edits Providers Should Check

Modifiers can affect how therapy claims are processed. They also attract attention when a practice applies them incorrectly.

Here are some that providers should recognize.

Modifier	Relevant use or consideration
GP	Services furnished under an outpatient physical therapy plan of care
GO	Services furnished under an outpatient occupational therapy plan of care
KX	Attestation that applicable Medicare therapy-threshold requirements are satisfied
CQ	Qualifying physical therapist assistant involvement
CO	Qualifying occupational therapy assistant involvement
59	Distinct procedural service, only when appropriately supported and permitted by coding edits

Can You Bill CPT 97750 With a PT or OT Evaluation?

For Medicare, this deserves particular attention.

The 2026 National Correct Coding Initiative (NCCI) policy states that CPT 97750 generally cannot be separately reported on the same date as PT or OT evaluation or re-evaluation services when one practitioner, or practitioners of the same specialty, perform both services.

A qualifying circumstance involving different practitioners of different specialties may permit separate reporting with an appropriate NCCI-associated modifier.

That doesn’t mean you should automatically add modifier 59 whenever the practice performs testing and an evaluation on the same day. The actual services, practitioner specialties, and applicable edit requirements determine whether separate reporting is allowed.

What Is the Medicare KX Threshold for 2026?

For calendar year 2026, CMS identifies a $2,480 KX modifier threshold for physical therapy and speech-language pathology combined, with a separate $2,480 threshold for occupational therapy.

Once applicable expenses exceed the relevant threshold, claims for medically necessary therapy services need the KX modifier when required. Crossing the threshold doesn’t automatically make the service ineligible for payment.

CMS also maintains a $3,000 targeted medical review threshold for each applicable category in 2026.

Providers should check these requirements when a functional performance test falls under Medicare outpatient therapy billing.

Why Do Functional Capacity Testing Claims Get Denied?

An FCE claim may contain the correct CPT code, appropriate diagnosis, and valid provider information but still come back unpaid.

Often, the problem lies in what the claim doesn’t explain.

Common CPT 97750 Denial Reasons

Claim problem	Why it causes trouble	What the provider should check
Missing medical necessity	Records don’t establish why testing was needed	Referral, clinical findings, and testing purpose
Missing written report	Payer cannot verify the service performed	Complete performance measurements and interpretation
Incorrect units	Time reported doesn’t match supporting records	Qualified minutes and payer-specific unit rules
Duplicate or bundled services	Testing overlaps with another reported evaluation	NCCI edits and same-day procedures
Authorization problems	Plan requires advance approval	Authorization requirements and approved scope
Diagnosis mismatch	Diagnosis doesn’t adequately support the testing	Documented condition and coding accuracy
Noncovered service	Payer excludes the requested type of assessment	Benefit language and payment responsibility

CARC Codes Providers May Encounter

When a payer denies or adjusts a claim, the electronic remittance advice may contain Claim Adjustment Reason Codes (CARCs).

Some potentially relevant codes include:

• CO-50: The payer considers the service medically unnecessary under its coverage rules.
• CO-16: The claim lacks information or contains a submission error needed for adjudication.
• CO-97: The payer considers the service included in payment for another service or procedure.
• CO-197: The payer identifies an authorization, notification, or precertification requirement that wasn’t met.

These examples don’t mean every 97750 denial will use one of these codes. Read the actual CARC, any Remittance Advice Remark Code (RARC), and the payer’s explanation before deciding what to correct.

How to Fix a Denied CPT 97750 Claim

A denial doesn’t always mean the service was reported incorrectly. Sometimes the payer needs additional documentation. In other cases, the original claim contains an error that requires a corrected submission.

The first move should be to identify the actual reason.

Step 1: Review the Payer’s Explanation

Read the remittance details and determine whether the claim was denied for coverage, coding, authorization, or missing information.

Don’t resubmit an unchanged claim without understanding the denial. That can create another rejection or denial rather than resolve the original problem.

Step 2: Compare the Claim With the Medical Record

Check the procedure code, units, diagnosis, rendering provider, modifiers, and date of service.

Then review the written testing report. Does it explain the clinical reason for the FCE and show what the provider measured?

Step 3: Correct Errors or Gather Supporting Evidence

If the practice submitted the wrong units, follow the payer’s corrected-claim process.

If the payer questions medical necessity, review the existing records for supporting information. The referral, progress notes, functional limitations, and completed test report may help explain why the assessment was appropriate.

Never add findings or change documented time simply to make the claim payable.

Step 4: Submit the Appropriate Appeal

Where the record supports coverage but the payer maintains a denial, prepare an appeal that directly addresses its stated reason.

Include relevant documentation, applicable policy language, and the clinical explanation for the service. Check the filing deadline before submission.

Step 5: Track the Outcome

Once the practice submits an appeal, monitor the response rather than treating the case as closed.

Watch for requests for records, upheld denials, additional adjustments, or payment. Patterns across multiple claims may also reveal a broader billing problem that needs attention.

How Providers Can Prevent Functional Capacity Testing Denials

The easiest denial to manage is the one that never reaches the payer.

A few checks before the appointment and before claim submission can prevent avoidable problems.

1. Confirm the payment source. Determine whether medical insurance, workers’ compensation, or another party is responsible for the evaluation.
2. Check coverage before testing. Review benefit limits, prior authorization, and documentation requirements.
3. Establish a clear clinical purpose. The referral and records should explain the functional question the assessment intends to answer.
4. Document actual testing time. Keep time records consistent with the billed units.
5. Complete the written report. Include objective results, interpretation, and the findings’ relevance to functional activities.
6. Review same-day services. Check for NCCI edits, bundled procedures, and modifier requirements.
7. Validate the claim. Compare CPT, ICD-10-CM, units, provider details, and authorization information before submission.

These checks won’t prevent every denial. They can, however, reduce errors that the practice has control over.

How Oregon Billing Can Help With Functional Capacity Testing Reimbursement

Your clinical staff shouldn’t have to spend hours chasing an FCE payment because a claim contained the wrong units or the payer requested records that the practice already had.

Functional capacity testing requires more than selecting CPT 97750. Providers must manage varying payer requirements, supporting documentation, timed billing, and sometimes complicated workers’ compensation arrangements.

Oregon Billing can support practices by reviewing coding accuracy, checking payer-specific claim requirements, identifying submission errors, and organizing denial follow-up.

Professional billing support can also help providers recognize recurring problems. If multiple FCE claims receive similar denials, examining the underlying pattern may reveal an issue with documentation, authorization checks, or coding workflows.