Summary & Overview

CPT 0542T: Multichannel Magnetocardiography for Cardiac Ischemia Detection

CPT code 0542T represents a single multichannel magnetocardiography (MCG) imaging study for detection of cardiac ischemia in patients presenting with chest pain. The code covers acquisition of magnetic-field, time-series images using a device with at least 36 channels, quantitative magnetic dipole analysis, automated scoring and reporting, and physician interpretation with a written report. Nationally, the code signals adoption of advanced noninvasive cardiac diagnostics that supplement existing ischemia evaluation pathways and may influence imaging utilization and diagnostic workflows.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise briefing on the clinical context of MCG for ischemia detection, the service setting and workflow implications, and the scope of the billed service. The publication provides benchmarks and coverage considerations relevant to payers and providers, highlights policy updates that may affect coding and reimbursement, and outlines practical elements for claims submission based on the defined service description. Data not available in the input is noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare0542TCPTmagnetocardiographycardiac imagingischemia detectiondiagnostic cardiologymedical billingimaging interpretation

Billing Code Overview

CPT code 0542T describes a single multichannel magnetocardiography (MCG) imaging study used to detect cardiac ischemia in a patient presenting with chest pain. The procedure uses an MCG device with a minimum of 36 channels to generate magnetic-field, time-series images, performs quantitative analysis of magnetic dipoles, provides a clinical score, and produces an automatic report. The provider interprets the findings and prepares a written report.

Service type: Diagnostic cardiac imaging with multichannel magnetocardiography and interpretation
Typical site of service: Hospital outpatient department, imaging center, or other diagnostic facility where advanced cardiac imaging is performed

Clinical & Coding Specifications

Clinical Context

A 58-year-old patient presents to an outpatient cardiac imaging center reporting acute onset chest discomfort and intermittent exertional chest tightness over several days. Vital signs are stable, and initial ECG and troponin results are non-diagnostic. The ordering cardiologist requests noninvasive multichannel magnetocardiography to evaluate for occult myocardial ischemia. The patient is screened for metal implants and contraindications, positioned in the magnetically shielded room, and a multichannel MCG system with at least 36 channels performs a single study that records magnetic-field, time-series cardiac signals. The interpreting provider (cardiologist or electrocardiography specialist) performs quantitative analysis of magnetic dipoles, reviews the automated clinical score and generated automatic report, documents interpretation findings, and prepares a final report sent to the referring clinician. Typical site of service is an outpatient hospital-based or freestanding cardiac imaging facility; the service may also occur in ambulatory surgical centers equipped with appropriate magnetically shielded rooms. Service type: advanced diagnostic noninvasive cardiac imaging with physician interpretation and reporting.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work required to interpret and report the MCG is substantially greater than typical due to complexity (document justification).
`23`	Unusual anesthesia	Rarely applicable; use only if unrelated anesthesia is required for the patient during the MCG study (document).
`52`	Reduced services	Use when the study is partially completed and substantially reduced from full protocol but not terminated.
`53`	Discontinued procedure	Use when the MCG study is started but terminated due to patient intolerance or safety concerns; document reason.
`54`	Surgical care only	Not typically applicable; would indicate only surgical portion if combined with other procedures.
`55`	Postoperative management only	Not typically applicable for diagnostic MCG.
`56`	Preoperative management only	Not typically applicable for this diagnostic service.
`62`	Two surgeons	Rarely applicable; use only if two qualified physicians jointly perform interpretation or technical acquisition per payer policy.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services furnished in whole or in part by a physician assistant, nurse practitioner, or clinical nurse specialist	Use when an advanced practice clinician performs the MCG acquisition or preliminary interpretation per state law and payer rules; include supervising physician per local rules.
`CQ`	Service furnished by a physical therapist in part C of Medicare Advantage demonstration areas (historical)	Uncommonly used; include only if specific payer requires this modifier.
`QK`	Medical direction of two, three, or four concurrent anesthesia procedures (more than 1 MD)	Not typically applicable to MCG; include only if anesthesia medical direction meets criteria.
`QX`	Modifier for CRNA service when performed under physician direction	Not typically applicable; include only if CRNA involved per payer rules.
`QY`	Medical direction of one CRNA by an anesthesiologist	Not typically applicable; include only if anesthesia services meet criteria.
`SH`	Speech-language pathology services under an assistant	Not applicable to MCG but included in the supplied list; avoid use unless an SPL provider is legitimately involved.
`SJ`	Stereotactic radiosurgery, other (specific uses)	Not applicable to diagnostic MCG; do not use.

Taxonomy Code	Specialty	Notes
2084P0800X	Cardiology	Interpreting cardiologists commonly order and interpret MCG studies and produce final reports.
2085R0200X	Cardiac Electrophysiology	Electrophysiologists evaluate arrhythmia correlates and dipole mapping from MCG data.
364S00000X	Diagnostic Radiology	Radiology practices or imaging centers may operate the MCG equipment and provide technical acquisition support.
363L00000X	Clinical Cardiac Electrophysiology Technician/Technologist	Technologists perform the acquisition and quality control of multichannel recordings.
3336S0121X	Cardiac Device Specialist	Device specialists may assist with screening for implants and safety clearance prior to MCG.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I20.9`	Angina pectoris, unspecified	Chest pain suggestive of myocardial ischemia is a primary indication for MCG evaluation.
`R07.9`	Chest pain, unspecified	Symptom-based presentation prompting noninvasive ischemia testing including MCG.
`I21.4`	Non-ST elevation (NSTEMI) myocardial infarction, unspecified	MCG may be used when ECG/troponin are non-diagnostic to detect ischemic signatures in suspected NSTEMI.
`I25.10`	Atherosclerotic heart disease of native coronary artery without angina pectoris	Chronic CAD patients with new or worsening chest symptoms may undergo MCG for ischemia assessment.
`R94.31`	Abnormal electrocardiogram [ECG]	When ECG abnormalities are present but inconclusive, MCG can provide additional electrophysiologic and ischemic information.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`93000`	Electrocardiogram, routine ECG with at least 12 leads; with interpretation and report	Often performed before or alongside MCG to provide standard electrical ECG correlation and to document baseline rhythm.
`93010`	Electrocardiogram interpretation and report only	Used when only the interpretation of a separately acquired ECG is billed in conjunction with MCG interpretation.
`93015`	Cardiovascular stress test using maximal or submaximal treadmill or bicycle exercise, with continuous ECG monitoring, with interpretation and report	May be performed before or after MCG when ischemia is exercise-induced and correlation with stress testing is needed.
`93306`	Echocardiography, transthoracic, real-time with image documentation, complete, with spectral and color Doppler	Frequently used adjunctively to assess cardiac structure and function when ischemia is suspected.
`93042`	Rhythm monitoring, 12 lead, continuous overnight, interpretation and report (Holter-type)	Ambulatory rhythm monitoring can complement MCG when intermittent symptoms or arrhythmias are of concern.

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Summary & Overview

CPT 0542T: Multichannel Magnetocardiography for Cardiac Ischemia Detection

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare0542TCPTmagnetocardiographycardiac imagingischemia detectiondiagnostic cardiologymedical billingimaging interpretation

Billing Code Overview

Service type: Diagnostic cardiac imaging with multichannel magnetocardiography and interpretation
Typical site of service: Hospital outpatient department, imaging center, or other diagnostic facility where advanced cardiac imaging is performed

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work required to interpret and report the MCG is substantially greater than typical due to complexity (document justification).
`23`	Unusual anesthesia	Rarely applicable; use only if unrelated anesthesia is required for the patient during the MCG study (document).
`52`	Reduced services	Use when the study is partially completed and substantially reduced from full protocol but not terminated.
`53`	Discontinued procedure	Use when the MCG study is started but terminated due to patient intolerance or safety concerns; document reason.
`54`	Surgical care only	Not typically applicable; would indicate only surgical portion if combined with other procedures.
`55`	Postoperative management only	Not typically applicable for diagnostic MCG.
`56`	Preoperative management only	Not typically applicable for this diagnostic service.
`62`	Two surgeons	Rarely applicable; use only if two qualified physicians jointly perform interpretation or technical acquisition per payer policy.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services furnished in whole or in part by a physician assistant, nurse practitioner, or clinical nurse specialist	Use when an advanced practice clinician performs the MCG acquisition or preliminary interpretation per state law and payer rules; include supervising physician per local rules.
`CQ`	Service furnished by a physical therapist in part C of Medicare Advantage demonstration areas (historical)	Uncommonly used; include only if specific payer requires this modifier.
`QK`	Medical direction of two, three, or four concurrent anesthesia procedures (more than 1 MD)	Not typically applicable to MCG; include only if anesthesia medical direction meets criteria.
`QX`	Modifier for CRNA service when performed under physician direction	Not typically applicable; include only if CRNA involved per payer rules.
`QY`	Medical direction of one CRNA by an anesthesiologist	Not typically applicable; include only if anesthesia services meet criteria.
`SH`	Speech-language pathology services under an assistant	Not applicable to MCG but included in the supplied list; avoid use unless an SPL provider is legitimately involved.
`SJ`	Stereotactic radiosurgery, other (specific uses)	Not applicable to diagnostic MCG; do not use.

Taxonomy Code	Specialty	Notes
2084P0800X	Cardiology	Interpreting cardiologists commonly order and interpret MCG studies and produce final reports.
2085R0200X	Cardiac Electrophysiology	Electrophysiologists evaluate arrhythmia correlates and dipole mapping from MCG data.
364S00000X	Diagnostic Radiology	Radiology practices or imaging centers may operate the MCG equipment and provide technical acquisition support.
363L00000X	Clinical Cardiac Electrophysiology Technician/Technologist	Technologists perform the acquisition and quality control of multichannel recordings.
3336S0121X	Cardiac Device Specialist	Device specialists may assist with screening for implants and safety clearance prior to MCG.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I20.9`	Angina pectoris, unspecified	Chest pain suggestive of myocardial ischemia is a primary indication for MCG evaluation.
`R07.9`	Chest pain, unspecified	Symptom-based presentation prompting noninvasive ischemia testing including MCG.
`I21.4`	Non-ST elevation (NSTEMI) myocardial infarction, unspecified	MCG may be used when ECG/troponin are non-diagnostic to detect ischemic signatures in suspected NSTEMI.
`I25.10`	Atherosclerotic heart disease of native coronary artery without angina pectoris	Chronic CAD patients with new or worsening chest symptoms may undergo MCG for ischemia assessment.
`R94.31`	Abnormal electrocardiogram [ECG]	When ECG abnormalities are present but inconclusive, MCG can provide additional electrophysiologic and ischemic information.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`93000`	Electrocardiogram, routine ECG with at least 12 leads; with interpretation and report	Often performed before or alongside MCG to provide standard electrical ECG correlation and to document baseline rhythm.
`93010`	Electrocardiogram interpretation and report only	Used when only the interpretation of a separately acquired ECG is billed in conjunction with MCG interpretation.
`93015`	Cardiovascular stress test using maximal or submaximal treadmill or bicycle exercise, with continuous ECG monitoring, with interpretation and report	May be performed before or after MCG when ischemia is exercise-induced and correlation with stress testing is needed.
`93306`	Echocardiography, transthoracic, real-time with image documentation, complete, with spectral and color Doppler	Frequently used adjunctively to assess cardiac structure and function when ischemia is suspected.
`93042`	Rhythm monitoring, 12 lead, continuous overnight, interpretation and report (Holter-type)	Ambulatory rhythm monitoring can complement MCG when intermittent symptoms or arrhythmias are of concern.