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Official Description

Pulmonary stress testing (eg, 6-minute walk test), including measurement of heart rate, oximetry, and oxygen titration, when performed

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 94618 refers to a specific type of pulmonary stress testing, commonly known as the 6-minute walk test. This test is designed to evaluate the exercise capacity of individuals who exhibit moderate to severe respiratory symptoms. The primary purpose of this assessment is to determine the functional status of the patient and the extent of any impairment they may be experiencing due to their respiratory condition. During the test, various physiological parameters are measured, including heart rate, blood pressure, and oxygen saturation levels, both before and during the exercise. The procedure involves the patient walking at their own pace along a designated corridor, typically measuring 30 meters (or 100 feet), for a duration of six minutes. This self-paced walking allows for a realistic assessment of the patient's endurance and response to physical exertion. Throughout the test, supplemental oxygen may be provided if necessary, based on the patient's oxygen saturation levels. After the completion of the walk, the recorded measurements are analyzed to evaluate the patient's response to exercise, the effectiveness of any administered medications such as inhaled bronchodilators or corticosteroids, and to identify any potential low oxygen levels that may require further intervention.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The pulmonary stress testing (CPT® Code 94618) is indicated for patients who present with moderate to severe respiratory symptoms. The following conditions may warrant the performance of this test:

  • Assessment of Functional Status This test helps in determining the functional capacity of individuals with respiratory issues, providing insight into their ability to perform daily activities.
  • Identification of Low Oxygen Levels The test is utilized to detect any instances of hypoxemia, or low oxygen levels in the blood, which may necessitate supplemental oxygen therapy.
  • Response to Supplemental Oxygen Therapy It evaluates how well a patient responds to supplemental oxygen, which is crucial for managing their respiratory condition effectively.
  • Assessment of Medication Response The test can also be used to assess the effectiveness of medications, such as inhaled bronchodilators and corticosteroids, in improving the patient's respiratory function.

2. Procedure

The procedure for pulmonary stress testing (CPT® Code 94618) involves several key steps that ensure accurate assessment of the patient's exercise capacity and respiratory function:

  • Step 1: Pre-Exercise Assessment Prior to the commencement of the test, the patient's heart rate, blood pressure, and oxygen saturation levels are measured and recorded. This baseline data is essential for comparison during and after the exercise.
  • Step 2: Patient Preparation The patient is prepared for the test by ensuring they are in a comfortable state and understand the procedure. They are informed that they will be walking at their own pace along a flat corridor.
  • Step 3: The 6-Minute Walk The patient then undertakes the 6-minute walk along a hard, flat corridor measuring 30 meters (100 feet). This self-paced exercise allows the patient to walk as far as they can within the allotted time, simulating real-life physical activity.
  • Step 4: Monitoring During Exercise Throughout the duration of the walk, the patient's heart rate, blood pressure, and oxygen saturation levels are continuously monitored and recorded. If indicated, supplemental oxygen is administered to maintain adequate oxygen levels.
  • Step 5: Post-Exercise Assessment After the completion of the 6-minute walk, the patient's heart rate, blood pressure, and oxygen saturation levels are assessed and recorded again. This post-exercise data is crucial for evaluating the patient's response to the physical exertion.

3. Post-Procedure

Following the pulmonary stress test, patients may experience varying levels of fatigue or shortness of breath, which are typically expected outcomes. It is important for healthcare providers to monitor the patient for any adverse reactions or complications that may arise post-exercise. The recorded measurements from the test will be analyzed to determine the patient's overall exercise capacity, response to supplemental oxygen, and the effectiveness of any medications administered during the test. Based on the results, further management or treatment plans may be developed to address the patient's respiratory condition effectively.

Short Descr PULMONARY STRESS TESTING
Medium Descr PULMONARY STRESS TESTING
Long Descr Pulmonary stress testing (eg, 6-minute walk test), including measurement of heart rate, oximetry, and oxygen titration, when performed
Status Code Active Code
Global Days XXX - Global Concept Does Not Apply
PC/TC Indicator (26, TC) 1 - Diagnostic Tests for Radiology Services
Multiple Procedures (51) 0 - No payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 0 - 150% payment adjustment for bilateral procedures does NOT apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 0 - Payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator STV-Packaged Codes
Berenson-Eggers TOS (BETOS) none
MUE 1
26 Professional component: certain procedures are a combination of a physician or other qualified health care professional component and a technical component. when the physician or other qualified health care professional component is reported separately, the service may be identified by adding modifier 26 to the usual procedure number.
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
GC This service has been performed in part by a resident under the direction of a teaching physician
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
TC Technical component; under certain circumstances, a charge may be made for the technical component alone; under those circumstances the technical component charge is identified by adding modifier 'tc' to the usual procedure number; technical component charges are institutional charges and not billed separately by physicians; however, portable x-ray suppliers only bill for technical component and should utilize modifier tc; the charge data from portable x-ray suppliers will then be used to build customary and prevailing profiles
GZ Item or service expected to be denied as not reasonable and necessary
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
52 Reduced services: under certain circumstances a service or procedure is partially reduced or eliminated at the discretion of the physician or other qualified health care professional. under these circumstances the service provided can be identified by its usual procedure number and the addition of modifier 52, signifying that the service is reduced. this provides a means of reporting reduced services without disturbing the identification of the basic service. note: for hospital outpatient reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well-being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
GA Waiver of liability statement issued as required by payer policy, individual case
CR Catastrophe/disaster related
76 Repeat procedure or service by same physician or other qualified health care professional: it may be necessary to indicate that a procedure or service was repeated by the same physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 76 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
Q6 Service furnished under a fee-for-time compensation arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area
GW Service not related to the hospice patient's terminal condition
UD Medicaid level of care 13, as defined by each state
25 Significant, separately identifiable evaluation and management service by the same physician or other qualified health care professional on the same day of the procedure or other service: it may be necessary to indicate that on the day a procedure or service identified by a cpt code was performed, the patient's condition required a significant, separately identifiable e/m service above and beyond the other service provided or beyond the usual preoperative and postoperative care associated with the procedure that was performed. a significant, separately identifiable e/m service is defined or substantiated by documentation that satisfies the relevant criteria for the respective e/m service to be reported (see evaluation and management services guidelines for instructions on determining level of e/m service). the e/m service may be prompted by the symptom or condition for which the procedure and/or service was provided. as such, different diagnoses are not required for reporting of the e/m services on the same date. this circumstance may be reported by adding modifier 25 to the appropriate level of e/m service. note: this modifier is not used to report an e/m service that resulted in a decision to perform surgery. see modifier 57 for significant, separately identifiable non-e/m services, see modifier 59.
53 Discontinued procedure: under certain circumstances, the physician or other qualified health care professional may elect to terminate a surgical or diagnostic procedure. due to extenuating circumstances or those that threaten the well being of the patient, it may be necessary to indicate that a surgical or diagnostic procedure was started but discontinued. this circumstance may be reported by adding modifier 53 to the code reported by the individual for the discontinued procedure. note: this modifier is not used to report the elective cancellation of a procedure prior to the patient's anesthesia induction and/or surgical preparation in the operating suite. for outpatient hospital/ambulatory surgery center (asc) reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
24 Unrelated evaluation and management service by the same physician or other qualified health care professional during a postoperative period: the physician or other qualified health care professional may need to indicate that an evaluation and management service was performed during a postoperative period for a reason(s) unrelated to the original procedure. this circumstance may be reported by adding modifier 24 to the appropriate level of e/m service.
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
77 Repeat procedure by another physician or other qualified health care professional: it may be necessary to indicate that a basic procedure or service was repeated by another physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 77 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
95 Synchronous telemedicine service rendered via a real-time interactive audio and video telecommunications system: synchronous telemedicine service is defined as a real-time interaction between a physician or other qualified health care professional and a patient who is located at a distant site from the physician or other qualified health care professional. the totality of the communication of information exchanged between the physician or other qualified health care professional and the patient during the course of the synchronous telemedicine service must be of an amount and nature that would be sufficient to meet the key components and/or requirements of the same service when rendered via a face-to-face interaction. modifier 95 may only be appended to the services listed in appendix p. appendix p is the list of cpt codes for services that are typically performed face-to-face, but may be rendered via a real-time (synchronous) interactive audio and video telecommunications system.
CC Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)
CS Cost-sharing waived for specified covid-19 testing-related services that result in and order for or administration of a covid-19 test and/or used for cost-sharing waived preventive services furnished via telehealth in rural health clinics and federally qualified health centers during the covid-19 public health emergency
GY Item or service statutorily excluded, does not meet the definition of any medicare benefit or, for non-medicare insurers, is not a contract benefit
HL Intern
KX Requirements specified in the medical policy have been met
PD Diagnostic or related non diagnostic item or service provided in a wholly owned or operated entity to a patient who is admitted as an inpatient within 3 days
PN Non-excepted service provided at an off-campus, outpatient, provider-based department of a hospital
Q0 Investigational clinical service provided in a clinical research study that is in an approved clinical research study
Q5 Service furnished under a reciprocal billing arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area
QJ Services/items provided to a prisoner or patient in state or local custody, however the state or local government, as applicable, meets the requirements in 42 cfr 411.4 (b)
RT Right side (used to identify procedures performed on the right side of the body)
SA Nurse practitioner rendering service in collaboration with a physician
X2 Continuous/focused services: for reporting services by clinicians whose expertise is needed for the ongoing management of a chronic disease or a condition that needs to be managed and followed with no planned endpoint to the relationship; reporting clinician service examples include but are not limited to: a rheumatologist taking care of the patient's rheumatoid arthritis longitudinally but not providing general primary care services
X3 Episodic/broad services: for reporting services by clinicians who have broad responsibility for the comprehensive needs of the patient that is limited to a defined period and circumstance such as a hospitalization; reporting clinician service examples include but are not limited to the hospitalist's services rendered providing comprehensive and general care to a patient while admitted to the hospital
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2018-01-01 Added Code Added.
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