CPT 70546Radiology

Mr angiograph head w/o&w/dye

CPT code 70546 is for an MR angiography (MRA) of the head performed twice—once without contrast dye and again with contrast dye injected into the bloodstream. This imaging study visualizes blood vessels in the brain to detect aneurysms, blockages, or vascular abnormalities.

Showing rates for

National Average

Base Medicare rate

$324.76

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

1.48

PE RVU (NF)

8.45

MP RVU

0.11

Total RVU

10.04

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Document medical necessity for dual-phase imaging explicitly—specify why both non-contrast and contrast phases were clinically required
Impact: Prevents downcoding to 70544 (without contrast only) or 70545 (with contrast only), preserving the full $324.76 reimbursement versus $267-$296 for single-phase studies
Verify contrast type and dosage documentation—gadolinium-based contrast agent name, dose, and route must be documented
Impact: Missing contrast documentation triggers automatic denials or downcoding to 70544, resulting in $30-60 underpayment per claim
Confirm that imaging sequences for both phases are distinctly documented in the radiology report with separate interpretations
Impact: Auditors look for evidence of both acquisitions; vague documentation risks recoupment of 15-20% of payments during post-payment audits
Do not bill 70546 with 70544 or 70545 for the same anatomical region on the same date—70546 is the comprehensive code
Impact: Prevents unbundling denials and potential fraud allegations; CCI edits will deny the separate codes with 100% payment loss
For bilateral imaging or multiple vascular territories, confirm the anatomical coverage matches 'head' definition—circle of Willis, intracranial vessels
Impact: Incorrect anatomical assignment (e.g., using head code for neck vessels) causes denials requiring extensive appeals and 4-8 week payment delays
Check patient renal function documentation before contrast administration and document GFR or creatinine levels
Impact: Lack of renal function screening increases medical liability and can trigger quality metric failures affecting facility accreditation and payer contracts

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Frequently asked questions

What is the difference between CPT 70546 and 70544?

CPT 70546 includes both non-contrast and contrast phases of head MR angiography, while 70544 is without contrast material only. Code 70546 reimburses at $324.76 and requires documentation of both imaging sequences, whereas 70544 is a lower-valued single-phase study used when contrast is contraindicated or not medically necessary.

How much does Medicare pay for CPT 70546 in 2025?

Medicare pays $324.76 for CPT 70546 under the 2025 Physician Fee Schedule (national average for both facility and non-facility settings). The code has 10.04 total RVUs with a conversion factor of 32.3465. Actual payment may vary by geographic locality.

Can I bill 70546 and 70553 together?

Generally no—billing both head MRA (70546) and brain MRI with contrast (70553) together often triggers bundling edits unless they address distinctly different clinical questions. If both are medically necessary, append modifier 59 to the secondary procedure and provide compelling documentation explaining why each study was separately required for different diagnostic purposes.

What diagnosis codes support medical necessity for 70546?

Common supporting diagnoses include cerebral aneurysm (I67.1), cerebrovascular stenosis (I65.x), subarachnoid hemorrhage (I60.x), transient ischemic attack (G45.x), arteriovenous malformation (I67.1), moyamoya disease (I67.5), and headache with suspected vascular etiology. Documentation must link the diagnosis to the need for vascular imaging with dual-phase technique.

Do I need prior authorization for CPT 70546?

Prior authorization requirements vary by payer. Most Medicare Advantage plans and many commercial insurers require preauthorization for advanced imaging including MRA studies. Failure to obtain required authorization can result in complete claim denial. Verify payer-specific requirements before scheduling.

What modifiers are most commonly used with 70546?

Modifier 26 (professional component) and TC (technical component) are most common for split billing between radiologist and facility. Modifier 59 is used for distinct procedural services when billed with other imaging. Modifier 76 applies for repeat procedures by the same physician on the same day due to technical issues.

How do I document medical necessity for both non-contrast and contrast phases?

Document specific clinical indications requiring dual-phase imaging, such as characterizing lesion enhancement patterns, differentiating slow flow from thrombus, evaluating aneurysm morphology, or assessing vessel wall enhancement. Reference ACR Appropriateness Criteria supporting dual-phase protocol for the clinical scenario. Include why single-phase imaging would be insufficient for diagnosis or treatment planning.