Summary & Overview
CPT 70546: Magnetic Resonance Angiography of Head, With and Without Contrast
CPT code 70546 denotes magnetic resonance angiography (MRA) of the head and surrounding vessels performed both without and with intravenous contrast. This diagnostic imaging code is nationally relevant due to the central role of MRA in evaluating cerebrovascular disease, suspected aneurysm or stenosis, and pre- or post-procedural vascular assessment. Use and reimbursement of this code affect hospital outpatient imaging volumes, radiology practice workflows, and imaging utilization policy.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, common settings where the service is delivered, and what benchmarks and policy items are typically assessed for this service nationally: utilization benchmarks, payment policy variations across major commercial payers and Medicare, prior authorization trends, and documentation expectations tied to clinical indications.
This publication provides practical reference material for coding and billing teams, radiology managers, and policy analysts seeking clear definitions, payer coverage scope, and the principal operational considerations associated with CPT code 70546. Data not available in the input.
Billing Code Overview
CPT code 70546 describes magnetic resonance angiography (MRA) of the vessels of the head and surrounding areas performed with and without contrast. The procedure includes initial non-contrast imaging of intracranial and extracranial vessels followed by administration of intravenous contrast and subsequent contrast-enhanced imaging.
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Service type: Diagnostic imaging — magnetic resonance angiography with and without contrast
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Typical site of service: Hospital outpatient imaging center or freestanding imaging facility equipped for MRI with contrast capabilities
Clinical & Coding Specifications
Clinical Context
A typical patient is a 58-year-old woman who presents to the emergency department with acute-onset severe headache and transient right-sided weakness. Neurologic exam is nonfocal after symptoms resolve. The emergency physician orders neurovascular imaging to evaluate for intracranial large-vessel occlusion, aneurysm, or arteriovenous malformation. The radiology department schedules a magnetic resonance angiography (MRA) of the head with and without contrast (70546).
The clinical workflow: the patient is registered and screened for MRI safety and renal function. A noncontrast MRA sequence is performed first to assess flow-related signal and identify vascular abnormalities without gadolinium. Following the noncontrast sequences, intravenous access is confirmed and gadolinium-based contrast is administered to obtain contrast-enhanced MRA sequences for improved vessel lumen delineation. A supervising radiologist reviews images, documents findings (e.g., stenosis, occlusion, aneurysm), and generates a final report. Images are archived and communicated to the referring neurologist for further management decisions.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the interpreting physician component separate from the technical component |
TC | Technical component | Use when billing only the equipment/technologist portion of the service |
59 | Distinct procedural service | Use when another separate, unrelated service was performed on the same day and documentation supports distinct service |
76 | Repeat procedure by same provider | Use when the same MRA is repeated by the same provider during the same day |
77 | Repeat procedure by another provider | Use when a repeat MRA is performed by a different provider on the same day |
52 | Reduced services | Use when the study is partially reduced or not completed (e.g., aborted exam due to patient intolerance) |
53 | Discontinued procedure | Use when the MRA is started but discontinued for documented medical reasons |
59 | Distinct procedural service | Use when a separate diagnostic procedure not normally reported together is performed (note: use sparingly per payer rules) |
76 | Repeat procedure by same provider | Use when image quality necessitates a repeat study same day by the same provider |
QK | Medical direction of 2-4 auxiliary personnel | Use in situations where physician-directed services meet specific anesthesia/monitoring qualifiers (rare for MRA) |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
2086S0101X | Diagnostic Radiology | Radiologists commonly interpret and supervise MRA studies |
207RC0000X | Neurology | Neurologists may request and review results for stroke evaluation |
2084P0808X | Vascular & Interventional Radiology | Vascular/interventional radiologists perform interpretation when planning interventions |
207L00000X | Emergency Medicine | Emergency physicians frequently initiate vascular imaging for acute neurologic presentations |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
I63.9 | Cerebral infarction, unspecified | Suspected ischemic stroke prompting vascular imaging to evaluate for vessel occlusion |
G45.9 | Transient cerebral ischemic attack, unspecified | TIA evaluation often includes MRA to assess for high-grade stenosis or embolic source |
I60.9 | Subarachnoid hemorrhage, unspecified | MRA is used to detect aneurysms as potential sources of subarachnoid hemorrhage when noninvasive imaging is preferred |
I67.4 | Hypertensive encephalopathy | Vascular imaging may be used to evaluate for secondary vascular pathology |
Q28.2 | Arteriovenous malformation of cerebral vessels | MRA identifies AVMs and helps in treatment planning |
R51 | Headache | Persistent or severe headache with neuro deficits may prompt MRA to exclude vascular causes |
G44.1 | Vascular headache, not elsewhere classified | Recurrent atypical headaches with concerning features may warrant vascular imaging |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
70450 | CT head/brain without contrast | Often performed prior to 70546 in acute settings to exclude hemorrhage before advanced vascular imaging |
70496 | CT angiography, head without contrast, followed by contrast (CTA) | Alternative vascular imaging modality when CT angiography is indicated instead of MRA |
70544 | MRI head without contrast, followed by contrast (routine brain MRI with and without contrast) | Performed when both parenchymal and vascular evaluation are needed alongside MRA |
73725 | MRI lower extremity, total joint, contrast as appropriate (example musculoskeletal) | Not directly related to head MRA; included only if vascular studies of other territories are performed in the same encounter |
93571 | Catheter angiography, cerebral (diagnostic) | Invasive diagnostic angiography may follow 70546 when therapeutic planning or precise vascular mapping is required |