CPT code 70549 – MRA neck with and without contrast

Key takeaways

CPT code 70549 covers MRA of the neck run as a without-then-with contrast series, billed once as one study.

The most common billing error is choosing 70548 (contrast only) when the report documents both phases.

The radiology report must describe the pre-contrast and post-contrast sequences separately before Medicare pays 70549.

Medicare coverage is contractor-specific, so check Novitas LCD L34865 or Palmetto LCD L34424 for your region.

Modifier 59 never unbundles 70549 from 70547 or 70548 billed on the same date.

CPT code 70549 covers a two-phase MRA of the neck

CPT code 70549 describes magnetic resonance angiography of the neck without contrast material, followed by contrast material and further sequences. The American Medical Association maintains the CPT code set and publishes this descriptor.

The key phrase is “without contrast followed by contrast.” The scanner runs a baseline pass with no contrast, the patient receives gadolinium, and the post-contrast sequences follow. Both phases belong to one study, billed once.

The code covers the neck vessels: the common, internal and external carotid arteries, the vertebral arteries, and nearby cervical vessels. It stops short of the intracranial circulation. When the radiologist also images the head, that study takes a separate code from the MRA head family, such as 70544. Check NCCI edits before you bill the pair.

The contrast protocol decides between 70547, 70548 and 70549

Three codes describe MRA of the neck: 70547, 70548 and 70549. Only the contrast protocol separates them. Picking the wrong one is the most common error on these claims.

The 70548 vs 70549 mix-up usually runs one way. The protocol ran both phases, but the coder or the order form defaults to 70548. The reverse happens too, and it costs more. Say the report describes only the post-contrast images. A payer reading that report will downcode a 70549 claim to 70548, or deny it outright.

Two questions about the report settle the code every time, as the diagram below shows.

The radiology report must prove both phases of a 70549 study

Payment for CPT code 70549 rests on the radiology report confirming every phase of the study. Auditors look for these five points.

1. Pre-contrast acquisition confirmed: The report states that non-contrast sequences were obtained. Time-of-flight (TOF) or phase-contrast angiography run before gadolinium qualifies. If the report doesn’t mention it, bill 70548.
2. Contrast agent documented: Record the agent name (typically a gadolinium-based agent), dose, route (IV) and administration time. Payers and auditors expect this in the radiologist’s attestation.
3. Post-contrast sequences confirmed: The report describes the contrast-enhanced phase separately from the pre-contrast run. “MRA neck with and without contrast performed” is not enough. Name the sequences or technique used for each phase.
4. Clinical indication stated: The referral note or radiology requisition gives the clinical reason. Typical examples are carotid stenosis, a suspected vertebral artery dissection, or a TIA workup. This is your medical necessity anchor.
5. Supervision and billing split recorded: In non-facility settings, the radiologist attests to the level of supervision the place of service requires. Hospital-based radiologist readings are billed with modifier 26. Global billing, with no modifier, applies when one entity owns the equipment and reads the study.

The simplest fix is upstream. Build these fields into the radiology order and the report template before the patient reaches the scanner.

Carotid and vertebral diagnoses carry medical necessity for 70549

Payers check the diagnosis paired with CPT code 70549 to confirm medical necessity. The ICD-10-CM codes below are the most commonly accepted pairings. You can look up any code’s full descriptor in our ICD-10-CM code library.

Medicare coverage guidance for MRA neck comes from Novitas LCD L34865 (billing article A56805) and Palmetto LCD L34424 (article A56775). Coverage is contractor-specific, so check the policy that applies to your region. Confirm the paired diagnosis appears on it before you submit.

Cervicalgia (M54.2) on its own is a high-risk pairing. Without clinical notes that document a vascular concern, it tends to trigger medical necessity review.

Medicare pays 70549 as a global, professional or technical service

Medicare reimburses CPT code 70549 under the Medicare Physician Fee Schedule (MPFS). Rates vary by place of service and by the geographic practice cost index (GPCI). The CMS MPFS lookup tool gives current-year rates by locality.

These figures are national averages for reference only. Your 2026 payment depends on your locality’s GPCI. The FastRVU 2026 RVU lookup shows the work, practice expense and malpractice RVUs for 70549 by location.

Commercial payers usually pay above Medicare levels, either as a percentage of MPFS or at a negotiated rate. Your electronic remittance advice is the quickest way to compare what you received against what the contract promised.

Modifiers 26 and TC split a 70549 claim between two billers

Three modifiers come up most often with CPT code 70549. The right one depends on who is billing and where the study took place.

Leave LT and RT off. The neck vessels are imaged on both sides, and the code isn’t lateralized. Most payers reject a 70549 line that carries either modifier.

A freestanding imaging center that owns the scanner and employs the radiologist bills globally, with no modifier. One payment then covers both components. Split billing with 26 and TC applies only when the radiologist and the facility bill separately.

Prior authorization for 70549 depends on the payer

Traditional Medicare rarely asks for prior authorization on MRA neck. Medicare Advantage plans, commercial insurers and Medicaid managed care plans often do.

• Medicare Advantage: Many plans route advanced imaging through eviCore or a similar radiology benefit manager. Outpatient MRA neck typically needs approval first.
• Commercial: It varies by plan. Plans with utilization management programs almost always require authorization for advanced imaging in the 70000 series.
• Medicaid managed care: Rules are state-specific, and most plans require authorization for non-emergency advanced imaging. Turnaround runs from 3 to 14 days, depending on the plan’s policy.
• Medicare Fee-for-Service (traditional): Generally no prior authorization for 70549. Medical necessity documentation still has to meet the contractor’s policy: Novitas LCD L34865 (billing article A56805) or Palmetto LCD L34424 (article A56775). Coverage is contractor-specific.

A missed authorization usually means a denial with no appeal path. The fix is to check at the point of ordering, not at billing. Insurance eligibility verification at scheduling catches the requirement while there’s still time to act.

A strong authorization packet for 70549 includes the ordering ICD-10 code, symptom history and duration, and any prior duplex ultrasound results. It also states the clinical question the MRA should answer.

NCCI edits stop 70549 from pairing with 70547 or 70548

The National Correct Coding Initiative (NCCI) decides which codes can be billed together on one date of service. For CPT code 70549, the usual same-day questions involve MRI brain codes and the other MRA neck codes.

Modifier 59 can’t break the 70549 + 70548 pair, because 70549 already includes the with-contrast phase. Billing both is unbundling. It triggers overpayment recovery and, if it keeps happening, a compliance problem.

The 70549 + 70553 pair needs a fresh look each time. Edit indicators change quarterly, so check the current NCCI table on the CMS site before you settle on a modifier strategy.

Most 70549 denials trace back to six fixable causes

Denials on CPT code 70549 follow a predictable pattern. Once you know the common triggers, you can fix them at the source instead of working each denial by hand. Good denial management for imaging codes starts at the front desk, not with the appeal letter.

• Wrong code selected (70548 billed instead of 70549): The report shows both phases, but the coder chose the contrast-only code. Send a corrected claim with the radiology report attached.
• Missing prior authorization: The plan required approval and nobody obtained it. Most plans won’t authorize retroactively, so the only protection is checking at scheduling.
• Contrast sequences not documented: The report doesn’t confirm both acquisitions, so the payer downcodes to 70548 or denies. The appeal needs an addendum from the interpreting radiologist confirming both phases.
• Unsupported diagnosis: The paired ICD-10 code isn’t on the payer’s covered list. Appeal with clinical documentation that shows medical necessity. For Medicare, cite the contractor’s policy: Novitas LCD L34865 (billing article A56805) or Palmetto LCD L34424 (article A56775).
• NCCI bundle conflict: 70549 billed with 70548 on the same date. Remove the bundled code on a corrected claim, because no modifier resolves this edit.
• Bilateral modifier error: LT or RT appended to 70549. Remove the modifier and resubmit.

For a Medicare medical necessity appeal, quote the LCD and billing article numbers from the CMS Medicare Coverage Database. Attach the relevant sections of the policy. Appeal forms vary by payer, so read the claim adjustment reason code (CARC) on the remittance first to find the right pathway.

Before you submit a 70549 claim: a quick checklist

Run through these six checks before the claim leaves the building. Each one maps to a denial reason above.

• The report describes the non-contrast pass and the post-contrast sequences separately.
• The contrast agent, dose, route and time are recorded.
• The diagnosis appears on the payer’s covered list, or the LCD for Medicare.
• Prior authorization is on file where the plan requires it.
• No 70547 or 70548 line sits on the same date of service.
• Modifier 26 or TC matches who owns the scanner, and no LT or RT is attached.

How claims management software keeps 70549 claims moving

Without a connected system, a billing team re-keys codes from the report, checks coverage by phone, and posts remittances by hand. Each handoff is a chance to drop a field or miss an approval.

Pabau, the practice management platform we build, includes claims management software for this work. It pre-fills the CPT and ICD-10 codes from the patient record. Then it checks that required claim fields are complete before sending. In the US, it submits claims to payers through Claim.MD and runs real-time eligibility checks through Claim.MD.

Built-in CPT and ICD-10 lookup libraries and required-field checks support clean claim submission on 837P electronic claims. When a 70549 claim comes back, the ERA posts back to the billing record. Corrected and secondary claims run through the same workflow.

Coding judgment still sits with your coder. Pabau doesn’t choose modifiers or evaluate NCCI pairs, so the checklist above stays part of the job.

Get 70549 claims out the door complete

Pabau pre-fills CPT and ICD-10 codes from the patient record and checks required claim fields before sending. US claims go through Claim.MD with real-time eligibility checks.

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Conclusion

CPT code 70549 pays when the report proves both phases. Coders can’t fix that at billing, so the work belongs with the radiologist and the report template. If your denials cluster on 70548 downcodes, start there.

The trade-off is a few extra lines at dictation against weeks of appeals later. After that, automating eligibility checks, claim-field validation and ERA reconciliation frees your team for the coding calls that need a person. Book a demo to see how Pabau handles claims for imaging codes like 70549.

Continue your research

Need to understand how clearinghouse claims validation works? Claim.MD clearinghouse guide explains how Pabau’s US clearinghouse partner routes electronic claims to payers.

Dealing with claim denials across your radiology billing workflow? Denial codes in medical billing explains common CARC denial codes, what each means, and how to respond at the claim level.

Want to see how the 837 electronic claim format affects your submissions? 837 file guide walks through the 837P claim file structure and how it maps to professional billing for outpatient imaging.

Losing imaging claims to missing approvals? Prior authorization process walks through each step, from the request to the payer’s decision.

Imaging the head as well as the neck? CPT code 70546 covers the matching without-then-with contrast MRA of the head.

Frequently asked questions