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Official Description

Magnetic resonance imaging, breast, without contrast material; unilateral

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

Magnetic resonance imaging (MRI) of the breast, as described by CPT® Code 77046, refers to a specialized imaging procedure that is performed on one breast without the use of contrast material. This noninvasive technique leverages the magnetic properties of hydrogen atoms present in the body. When exposed to a strong magnetic field and radio waves, the nuclei of these hydrogen atoms emit radiofrequency signals. A computer then processes these signals to generate high-resolution, tomographic, three-dimensional images of the breast's internal structures. This imaging modality is particularly useful for evaluating breast tissue and identifying any abnormalities such as lesions, tumors, or masses. During the procedure, patients may be administered a sedative to help them remain still, as the imaging requires the patient to lie on a motorized table within a large MRI tunnel. The resulting images provide critical information for diagnostic purposes, aiding healthcare professionals in making informed decisions regarding patient care.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 77046 is indicated for various clinical scenarios where detailed imaging of breast tissue is necessary. The following conditions may warrant the use of this MRI technique:

  • Evaluation of Breast Abnormalities This procedure is often performed to assess any detected abnormalities in breast tissue, such as lumps or areas of concern identified during physical examinations or other imaging studies.
  • Assessment of Tumors MRI is utilized to evaluate the extent of known breast tumors, helping to determine their size and whether they have spread to surrounding tissues.
  • Screening in High-Risk Patients Women with a family history of breast cancer or genetic predispositions may undergo this imaging to screen for potential malignancies that may not be visible through traditional mammography.
  • Monitoring Treatment Response This imaging technique can be used to monitor the effectiveness of ongoing treatment for breast cancer, providing insights into changes in tumor size or characteristics.

2. Procedure

The procedure for performing an MRI of the breast without contrast material involves several key steps that ensure accurate imaging results. The following outlines the procedural steps:

  • Patient Preparation Prior to the MRI, the patient is informed about the procedure and any necessary preparations, such as removing metal objects and changing into a gown. The healthcare provider may also discuss the use of a sedative to help the patient remain still during the imaging process.
  • Positioning The patient is positioned on a motorized table, typically lying face down, with the breast to be imaged placed in a dedicated coil that is designed to capture high-quality images. This positioning is crucial for obtaining clear and detailed images of the breast tissue.
  • Imaging Process Once the patient is comfortably positioned, the MRI machine is activated. The machine generates a strong magnetic field and radio waves, which interact with the hydrogen atoms in the body. The emitted radiofrequency signals are captured and processed by a computer to create detailed images of the breast.
  • Image Acquisition The imaging process may take approximately 30 to 60 minutes, during which the patient must remain still to avoid motion artifacts that could compromise image quality. The MRI technician monitors the patient throughout the procedure to ensure comfort and safety.
  • Completion and Recovery After the imaging is completed, the patient is assisted off the table and may be monitored briefly if a sedative was administered. The images are then reviewed by a radiologist for interpretation and reporting.

3. Post-Procedure

Following the MRI procedure, patients may experience some minor discomfort or a feeling of pressure in the breast area due to the positioning during the scan. It is generally recommended that patients resume their normal activities immediately after the procedure, unless otherwise advised by their healthcare provider. The radiologist will analyze the images and provide a report to the referring physician, who will discuss the findings with the patient and determine any necessary follow-up actions or additional testing based on the results.

Short Descr MRI BREAST C- UNILATERAL
Medium Descr MRI BREAST WITHOUT CONTRAST MATERIAL UNILATERAL
Long Descr Magnetic resonance imaging, breast, without contrast material; unilateral
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 Codes That May Be Paid Through a Composite APC
ASC Payment Indicator Radiology service paid separately when provided integral to a surgical procedure on ASC list; payment based on OPPS relative payment weight.
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.

0649T Add-on Code MPFS Status: Carrier Priced APC S Quantitative magnetic resonance for analysis of tissue composition (eg, fat, iron, water content), including multiparametric data acquisition, data preparation and transmission, interpretation and report, obtained with diagnostic MRI examination of the same anatomy (eg, organ, gland, tissue, target structure); single organ (List separately in addition to code for primary procedure)
0698T Add-on Code Resequenced Code MPFS Status: Carrier Priced APC S ASC Z2 Quantitative magnetic resonance for analysis of tissue composition (eg, fat, iron, water content), including multiparametric data acquisition, data preparation and transmission, interpretation and report, obtained with diagnostic MRI examination of the same anatomy (eg, organ, gland, tissue, target structure); multiple organs (List separately in addition to code for primary procedure)
C8937 Medicare Coverage: Special Coverage Instructions Add-on Code APC N Computer-aided detection, including computer algorithm analysis of breast mri image data for lesion detection/characterization, pharmacokinetic analysis, with further physician review for interpretation (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.
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).
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.
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.
CR Catastrophe/disaster related
GC This service has been performed in part by a resident under the direction of a teaching physician
LT Left side (used to identify procedures performed on the left side of the body)
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
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
RT Right side (used to identify procedures performed on the right side of the body)
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
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
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2019-01-01 Added Added
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