75561

Cardiac magnetic resonance imaging for morphology and function, without and with stress imaging, with or without contrast material(s); including morphology and function (for comparison), when performed

Cardiac magnetic resonance imaging (CMR) code 75561 describes a comprehensive non-invasive imaging procedure that utilizes strong magnetic fields and radio waves to create detailed images of the heart's structure (morphology) and its pumping ability (function). This specific code includes both resting and stress imaging components, allowing for the evaluation of myocardial perfusion and wall motion abnormalities under pharmacological stress (e.g., using dobutamine, adenosine, or regadenoson). The procedure may or may not involve the administration of contrast material (typically gadolinium-based) to enhance tissue characterization, delineate scar tissue (e.g., delayed enhancement), or improve blood pool visualization. The "including morphology and function (for comparison), when performed" clause indicates that baseline (non-stress) images of morphology and function are obtained and compared to images acquired during or after stress, providing a complete functional and structural assessment.

Clinical Indications

  • Assessment of myocardial ischemia in patients with chest pain, atypical symptoms, or equivocal stress tests.
  • Evaluation of myocardial viability and scar burden post-myocardial infarction.
  • Diagnosis and comprehensive assessment of various cardiomyopathies (e.g., dilated, hypertrophic, restrictive, arrhythmogenic right ventricular).
  • Characterization of cardiac masses, tumors, or thrombi.
  • Evaluation of congenital heart disease for complex anatomy, ventricular function, and shunt quantification.
  • Assessment of pericardial diseases, such as constrictive pericarditis or effusions.
  • Quantification of ventricular volumes, mass, and ejection fraction in various cardiac conditions.
  • Detailed assessment of valvular heart disease, including quantification of regurgitation or stenosis severity and impact on ventricular function.
  • Evaluation of aortic diseases (e.g., aneurysms, dissections, coarctation) in proximity to the heart.
  • Assessment of myocarditis or other inflammatory cardiac conditions.

Procedure Steps

  1. Patient preparation: including obtaining informed consent, removal of all metallic objects, establishment of intravenous access if contrast or stress agent is required, and vital sign monitoring.
  2. ECG gating: application of electrodes for continuous electrocardiographic monitoring to synchronize image acquisition with cardiac motion.
  3. Patient positioning: placement of the patient supine within the MRI scanner, often with coil placement over the chest.
  4. Scout images: acquisition of initial low-resolution images to plan subsequent imaging planes.
  5. Resting imaging sequences: acquisition of cine images for ventricular function and morphology, flow imaging, and potentially T1/T2 mapping or other tissue characterization sequences without stress.
  6. Stress agent administration: intravenous infusion of a pharmacological stress agent (e.g., dobutamine, adenosine, regadenoson) under continuous monitoring of ECG and blood pressure.
  7. Stress imaging sequences: acquisition of myocardial perfusion images and/or stress cine images during peak pharmacological stress.
  8. Contrast material administration: intravenous injection of gadolinium-based contrast agent, if indicated.
  9. Post-contrast imaging sequences: acquisition of delayed gadolinium enhancement (DGE) images approximately 10-20 minutes post-contrast to identify myocardial fibrosis or scar.
  10. Image reconstruction and post-processing: creation of high-resolution images and quantitative analysis of ventricular function, volumes, flow, and perfusion.
  11. Radiologist interpretation: comprehensive review of all acquired images and generation of a detailed diagnostic report.

Coding Guidelines

  • Code 75561 represents a complete cardiac MRI study including both rest and stress components, covering morphology and function evaluation, with or without contrast.
  • Do not report 75561 in conjunction with 75557, 75558, 75559, or 75560, as these codes represent components of 75561 or less comprehensive studies.
  • The administration of the pharmacological stress agent (e.g., dobutamine, adenosine, regadenoson) should be reported separately using appropriate HCPCS Level II codes (e.g., J0153, J0280, J1245, J2780).
  • Physician supervision for the stress portion of the test (e.g., code 93016 for stress test supervision, interpretation, and report or 93018 for stress test supervision and interpretation) should be reported separately when applicable.
  • Detailed documentation must support the medical necessity for both morphology/function assessment and the stress component, clearly indicating the clinical question being addressed.
  • The technical component (TC) covers the equipment, supplies, and technologist services, while the professional component (26) covers the radiologist's interpretation and report.

Associated ICD-10 Codes