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Official Description

Computed tomography, thorax, low dose for lung cancer screening, without contrast material(s)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

A low dose computed tomography (CT) scan of the thorax, designated by CPT® Code 71271, is a specialized imaging procedure primarily utilized for lung cancer screening. This method is particularly recommended for adults aged between 50 and 80 years who possess a significant smoking history, specifically those with a 20 pack-year history of smoking. The procedure is aimed at individuals who are at high risk for developing lung cancer but currently exhibit no symptoms. The annual screening is advised for those who have quit smoking within the last 15 years or for individuals who continue to smoke. The low dose aspect of this CT scan is crucial as it minimizes the radiation exposure to the patient while still providing detailed images of the lungs, which is essential for early detection of potential malignancies. The low dose CT scan operates by utilizing multiple, narrow X-ray beams that rotate around a single axis, capturing a series of two-dimensional images from various angles. These images are then processed by advanced computer software to create thin, cross-sectional images of the thoracic region. Furthermore, by stacking these individual 2D slices, three-dimensional models of the lungs can be generated, enhancing the visualization of any abnormalities. During the procedure, the patient is positioned on a table that slides into the CT scanner, where the imaging takes place. Following the scan, a physician meticulously reviews the obtained images to identify any lumps, tumors, or masses, and subsequently provides a written interpretation of the findings, which is critical for determining the next steps in patient care.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The low dose computed tomography (CT) scan of the thorax, coded as CPT® 71271, is indicated for specific patient populations based on their smoking history and age. The following conditions warrant the use of this screening procedure:

  • Age Range: Adults aged 50 to 80 years.
  • Smoking History: Individuals with a 20 pack-year history of smoking.
  • High Risk for Lung Cancer: Patients who are at high risk for lung cancer but currently do not exhibit any symptoms.
  • Recent Smoking Cessation: Those who have quit smoking within the last 15 years.
  • Current Smokers: Individuals who are still actively smoking.

2. Procedure

The procedure for conducting a low dose CT scan of the thorax involves several critical steps to ensure accurate imaging and patient safety. Each step is designed to optimize the quality of the images while minimizing radiation exposure.

  • Step 1: Patient Preparation The patient is first prepared for the procedure, which includes explaining the process and ensuring they understand the importance of remaining still during the scan. The patient may be asked to remove any clothing or accessories that could interfere with the imaging, such as jewelry or metal objects.
  • Step 2: Positioning The patient is then positioned on the CT scanner table, typically lying on their back. Proper alignment is crucial as it ensures that the thoracic area is centered within the scanner for optimal imaging.
  • Step 3: Scanning Process Once the patient is in position, the CT scanner begins to take images. The machine uses multiple, narrow X-ray beams that rotate around the patient, capturing a series of two-dimensional images from various angles. The low dose setting is employed to reduce radiation exposure while still providing high-quality images.
  • Step 4: Image Processing After the images are captured, advanced computer software processes the data to create thin, cross-sectional images of the thorax. These images are essential for identifying any potential abnormalities within the lungs.
  • Step 5: 3D Reconstruction The individual 2D slices are then stacked to create three-dimensional models of the lungs, allowing for a more comprehensive view of the thoracic anatomy and any detected lesions.
  • Step 6: Image Review Finally, a physician reviews the images to identify any lumps, tumors, or masses. The physician notes any abnormalities and provides a detailed written interpretation of the findings, which is crucial for further patient management.

3. Post-Procedure

After the completion of the low dose CT scan, there are several considerations for post-procedure care. Patients are typically able to resume their normal activities immediately, as the procedure is non-invasive and does not require sedation. However, they may be advised to wait for the results, which will be communicated by their healthcare provider. The physician will discuss any findings from the scan, including the presence of any abnormalities, and outline the next steps in terms of further testing or follow-up appointments if necessary. It is important for patients to understand the significance of the results and to maintain regular screenings as recommended, especially if they fall within the high-risk categories.

Short Descr CT THORAX LUNG CANCER SCR C-
Medium Descr COMPUTED TOMOGRAPHY THORAX LW DOSE LNG CA SCR C-
Long Descr Computed tomography, thorax, low dose for lung cancer screening, without contrast material(s)
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) 4 - Special payment adjustment rules on the technical component (TC) of multiple diagnostic imaging 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 88 -
APC Status Indicator Procedure or Service, Not Discounted when Multiple
Type of Service (TOS) 4 - Diagnostic Radiology
Berenson-Eggers TOS (BETOS) none
MUE 1

This is a primary code that can be used with these additional add-on codes.

0722T Add On Code MPFS Status: Carrier Priced APC S Quantitative computed tomography (CT) tissue characterization, including interpretation and report, obtained with concurrent CT examination of any structure contained in the concurrently acquired diagnostic imaging dataset (List separately in addition to code for primary procedure)
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.
X5 Diagnostic services requested by another clinician: for reporting services by a clinician who furnishes care to the patient only as requested by another clinician or subsequent and related services requested by another clinician; this modifier is reported for patient relationships that may not be adequately captured by the above alternative categories; reporting clinician service examples include but are not limited to, the radiologist's interpretation of an imaging study requested by another clinician
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
GC This service has been performed in part by a resident under the direction of a teaching physician
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).
GA Waiver of liability statement issued as required by payer policy, individual case
ME The order for this service adheres to appropriate use criteria in the clinical decision support mechanism consulted by the ordering professional
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
MG The order for this service does not have applicable appropriate use criteria in the qualified clinical decision support mechanism consulted by the ordering professional
MH Unknown if ordering professional consulted a clinical decision support mechanism for this service, related information was not provided to the furnishing professional or provider
GZ Item or service expected to be denied as not reasonable and necessary
CR Catastrophe/disaster related
QQ Ordering professional consulted a qualified clinical decision support mechanism for this service and the related data was provided to the furnishing professional
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
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
CT Computed tomography services furnished using equipment that does not meet each of the attributes of the national electrical manufacturers association (nema) xr-29-2013 standard
MC Ordering professional is not required to consult a clinical decision support mechanism due to the significant hardship exception of electronic health record or clinical decision support mechanism vendor issues
MF The order for this service does not adhere to the appropriate use criteria in the clinical decision support mechanism consulted by the ordering professional
FY X-ray taken using computed radiography technology/cassette-based imaging
MA Ordering professional is not required to consult a clinical decision support mechanism due to service being rendered to a patient with a suspected or confirmed emergency medical condition
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).
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.
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.
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.
97 Rehabilitative services: when a service or procedure that may be either habilitative or rehabilitative in nature is provided for rehabilitative purposes, the physician or other qualified health care professional may add modifier 97 to the service or procedure code to indicate that the service or procedure provided was a rehabilitative service. rehabilitative services help an individual keep, get back, or improve skills and functioning for daily living that have been lost or impaired because the individual was sick, hurt, or disabled.
CC Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)
GG Performance and payment of a screening mammogram and diagnostic mammogram on the same patient, same day
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
GW Service not related to the hospice patient's terminal condition
GX Notice of liability issued, voluntary under payer policy
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
KX Requirements specified in the medical policy have been met
LT Left side (used to identify procedures performed on the left side of the body)
MB Ordering professional is not required to consult a clinical decision support mechanism due to the significant hardship exception of insufficient internet access
PN Non-excepted service provided at an off-campus, outpatient, provider-based department of a hospital
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
Q3 Live kidney donor surgery and related services
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)
X4 Episodic/focused services: for reporting services by clinicians who provide focused care on particular types of treatment limited to a defined period and circumstance; the patient has a problem, acute or chronic, that will be treated with surgery, radiation, or some other type of generally time-limited intervention; reporting clinician service examples include but are not limited to, the orthopedic surgeon performing a knee replacement and seeing the patient through the postoperative period
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
XP Separate practitioner, a service that is distinct because it was performed by a different practitioner
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
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2021-01-01 Added Code added.
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