Clinical Context
A typical patient is an adult with chronic low back pain and suspected degenerative disc disease referred for a diagnostic magnetic resonance imaging exam using a low-field MRI system when high-field MRI is unavailable, contraindicated, or when clinical need/setting favors low-field imaging (eg, claustrophobic patients tolerating upright/open scanners, bedside imaging in an inpatient unit, or facilities using portable low-field units). The clinical workflow begins with an order from a referring provider (eg, orthopedic surgeon, neurosurgeon, or primary care physician) documenting symptoms such as radicular leg pain, neurologic deficit, or suspicion for herniated disc. The patient is screened for MRI safety (implants, ferromagnetic objects, and implants that are MRI-conditional), scheduled at the radiology department or designated imaging suite, and completes pre-scan screening and consent. The low-field MRI exam is performed by an MRI technologist; image acquisition protocols are selected to evaluate the relevant spine region (cervical, thoracic, lumbar) or other indicated anatomy. Images are transmitted to the radiologist for interpretation; the radiologist provides a report documenting findings (eg, disc herniation, spinal stenosis, metastatic disease) and any comparison to prior imaging. Billing uses S8042 to indicate magnetic resonance imaging performed on a low-field MRI system, with appropriate modifiers appended for professional component, technical component, place of service, or unusual circumstances as required by the payer. Typical sites of service include outpatient imaging centers, hospital radiology departments, and inpatient wards where portable low-field units are used.