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Official Description

Magnetic resonance (eg, proton) imaging, brain (including brain stem); without contrast material

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

Magnetic resonance imaging (MRI) of the brain, specifically coded as CPT® 70551, is a sophisticated imaging technique that utilizes the magnetic properties of hydrogen atoms present in the body to create detailed images of the brain and brain stem. This noninvasive procedure does not involve the use of ionizing radiation, making it a safer alternative for patients requiring diagnostic imaging. During the MRI process, the patient is positioned on a motorized table that slides into a large cylindrical scanner, which houses a powerful magnet. The magnetic field generated by the scanner aligns the hydrogen atoms in the body. Subsequently, radiowaves are transmitted into this magnetic field, causing the protons in the hydrogen nuclei of various tissues to emit specific radiofrequency signals. These signals are captured and processed by a computer, which constructs high-resolution, three-dimensional images of the brain. MRI of the brain is instrumental in diagnosing a wide range of neurological conditions. It provides critical information regarding the presence, location, and extent of various abnormalities, including tumors, cysts, and other masses. Additionally, it is effective in identifying swelling, infections, vascular disorders such as aneurysms and intracranial hemorrhages, and diseases affecting the pituitary gland. The procedure is also valuable in assessing strokes, developmental and structural anomalies of the brain, hydrocephalus, and chronic conditions impacting the central nervous system, including headaches and multiple sclerosis. When the MRI is performed without the use of intravenous contrast material, the appropriate code to report is 70551. In cases where contrast dye, such as gadolinium, is administered prior to imaging, the correct code is 70552. If the MRI is initially conducted without contrast and additional images are obtained after the administration of contrast, the code 70553 should be used. Following the procedure, the physician reviews the MRI results, identifies any abnormalities, and provides a comprehensive written interpretation of the findings.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The MRI of the brain, coded as CPT® 70551, is indicated for a variety of neurological conditions and symptoms. The following are the explicitly provided indications for performing this procedure:

  • Tumors - To diagnose the presence, location, and extent of brain tumors or other masses.
  • Cysts - To identify and assess brain cysts.
  • Swelling and Infection - To evaluate areas of swelling or infection within the brain.
  • Vascular Disorders - To detect vascular malformations, such as aneurysms and intracranial hemorrhages.
  • Pituitary Gland Disease - To assess conditions affecting the pituitary gland.
  • Stroke - To evaluate the presence and extent of stroke-related damage.
  • Developmental and Structural Anomalies - To identify any developmental or structural anomalies of the brain.
  • Hydrocephalus - To diagnose and assess hydrocephalus.
  • Chronic Conditions - To evaluate chronic conditions affecting the central nervous system, such as headaches and multiple sclerosis.

2. Procedure

The procedure for conducting an MRI of the brain without contrast material involves several key steps, which are detailed below:

  • Patient Preparation - The patient is first prepared for the MRI by explaining the procedure and ensuring that they are comfortable. It is important to remove any metal objects, such as jewelry or hairpins, as these can interfere with the magnetic field.
  • Positioning - The patient is then positioned on a motorized table that will slide into the MRI scanner. Proper alignment is crucial to ensure that the area of interest is adequately imaged.
  • Scanning Process - Once the patient is in position, the MRI machine is activated. The powerful magnet creates a strong magnetic field, which aligns the hydrogen atoms in the body. Radiowaves are then sent into the body, causing the protons to emit signals that are captured by the MRI machine.
  • Image Acquisition - The emitted signals are processed by a computer to create detailed, high-resolution images of the brain. The imaging process typically takes between 20 to 60 minutes, depending on the specific protocols used.
  • Post-Procedure Review - After the imaging is complete, the patient is carefully removed from the scanner. The physician will then review the images for any abnormalities and prepare a written interpretation of the findings.

3. Post-Procedure

After the MRI procedure is completed, there are generally no specific post-procedure care requirements, as the MRI is noninvasive and does not involve the use of contrast material. Patients can typically resume their normal activities immediately following the procedure. However, if any sedation was used, patients may need to be monitored until the effects wear off. The physician will provide a written report detailing the findings from the MRI, which will be discussed with the patient in a follow-up appointment to determine any necessary next steps or treatments based on the results.

Short Descr MRI BRAIN STEM W/O DYE
Medium Descr MRI BRAIN BRAIN STEM W/O CONTRAST MATERIAL
Long Descr Magnetic resonance (eg, proton) imaging, brain (including brain stem); without contrast material
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 MPFS nonfacility PE RVUs.
Type of Service (TOS) 4 - Diagnostic Radiology
Berenson-Eggers TOS (BETOS) I2C - Advanced imaging - MRI/MRA: brain/head/neck
MUE 2
CCS Clinical Classification 198 - Magnetic resonance imaging

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)
0866T Add On Code MPFS Status: Carrier Priced APC S Quantitative magnetic resonance image (MRI) analysis of the brain with comparison to prior magnetic resonance (MR) study(ies), including lesion detection, characterization, and quantification, with brain volume(s) quantification and/or severity score, when performed, data preparation and transmission, interpretation and report, obtained with diagnostic MRI examination of the brain (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
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).
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
ME The order for this service adheres to 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
GA Waiver of liability statement issued as required by payer policy, individual case
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
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
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.
QQ Ordering professional consulted a qualified clinical decision support mechanism for this service and the related data was provided to the furnishing professional
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
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
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
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).
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
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
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.
GW Service not related to the hospice patient's terminal condition
CR Catastrophe/disaster related
XP Separate practitioner, a service that is distinct because it was performed by a different practitioner
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
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
22 Increased procedural services: when the work required to provide a service is substantially greater than typically required, it may be identified by adding modifier 22 to the usual procedure code. documentation must support the substantial additional work and the reason for the additional work (ie, increased intensity, time, technical difficulty of procedure, severity of patient's condition, physical and mental effort required). note: this modifier should not be appended to an e/m service.
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).
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.
AM Physician, team member service
CC Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)
CG Policy criteria applied
ET Emergency services
GQ Via asynchronous telecommunications system
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
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
GZ Item or service expected to be denied as not reasonable and necessary
H9 Court-ordered
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
MD Ordering professional is not required to consult a clinical decision support mechanism due to the significant hardship exception of extreme and uncontrollable circumstances
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
PO 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
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
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
U2 Medicaid level of care 2, as defined by each state
U6 Medicaid level of care 6, as defined by each state
UA Medicaid level of care 10, as defined by each state
Date
Action
Notes
2013-01-01 Changed Short Descriptor changed.
Pre-1990 Added Code added.
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