Summary & Overview
HCPCS S8042: Magnetic Resonance Imaging, Low-Field
HCPCS Level II code S8042 designates low-field magnetic resonance imaging (MRI), a diagnostic imaging modality used for a range of clinical indications where lower magnetic field strength is appropriate. Low-field MRI can offer advantages in certain clinical scenarios such as improved safety for some implants, reduced susceptibility artifacts, and lower operational costs; it remains an important option within the broader MRI service mix. Nationally, clear identification of services by HCPCS codes enables consistent billing, coverage determinations, and utilization monitoring across payers.
Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of how S8042 is classified, typical sites of service, and the clinical context for low-field MRI. The publication summarizes benchmark concepts for reimbursement and utilization, notes relevant payer coverage trends where available, and highlights policy and coding considerations affecting billing for MRI services. This resource is intended to inform billing staff, revenue cycle professionals, and policy analysts on the clinical definition and payer landscape for HCPCS Level II code S8042 so they can interpret coverage policies and billing workflows consistently in a national context. Data not available in the input is noted where specific payer rates, taxonomies, or related codes would normally appear.
Billing Code Overview
HCPCS Level II code S8042 represents magnetic resonance imaging (MRI), low-field. This code describes the performance of a low-field MRI scan, a diagnostic imaging service that uses lower-strength magnetic fields compared with standard high-field MRI systems.
Service Type: Imaging — Magnetic Resonance Imaging (MRI)
Typical Site of Service: Outpatient imaging center or hospital radiology department
Clinical & Coding Specifications
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.
Coding Specifications
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