CPT code 72157: MRI thoracic spine without and with contrast

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Key takeaways

CPT code 72157 reports thoracic spine MRI without contrast followed by with contrast, which separates it from the single-phase codes 72146 and 72147.

Medicare assigns 72157 the same total RVUs in a facility as in an office, so the setting alone does not change the total payment.

Modifiers -26 and -TC divide the professional and technical components, and -59 overrides NCCI bundling edits where they apply.

Claims management software can flag an incomplete modifier field or a missing prior authorization before a 72157 claim leaves the queue.

CPT code 72157 is the billing code for magnetic resonance imaging of the thoracic spinal canal and its contents. The study runs without contrast material first, then with contrast material and further sequences.

Radiologists and billing staff use it to report that complete two-phase thoracic spine exam. It is the counterpart to 72146, which reports the same anatomy without contrast, and 72147, which reports it with contrast only.

Medicare’s 2026 national average lands at roughly $290 to $350 for the global service, and the facility total sits in the same range. The setting is not what moves the payment on this code. Modifier -26 and modifier -TC are.

This reference covers the official descriptor, 2026 fee schedule rates, modifiers, ICD-10 pairings, documentation standards, and the neighboring spinal MRI codes.

What CPT code 72157 covers

The American Medical Association (AMA) publishes the official descriptor. It reads: Magnetic resonance imaging, spinal canal and contents, thoracic; without contrast material(s), followed by with contrast material(s) and further sequences.

The code sits within the Radiology chapter of the CPT code set, under the Magnetic Resonance subsection.

The “without followed by with contrast” sequencing means the scanner captures pre-contrast images of the thoracic spine first. Gadolinium-based contrast is then administered and a second set is acquired.

Physicians order the combined protocol when they need baseline anatomy alongside enhanced views. The usual reasons are characterizing a lesion, assessing cord signal abnormalities, or evaluating for demyelinating disease and metastatic involvement.

2026 Medicare reimbursement and fee schedule

Medicare reimbursement for CPT code 72157 is published annually in the CMS Physician Fee Schedule Look-Up Tool. Rates vary by place of service, Medicare Administrative Contractor (MAC) locality, and Geographic Practice Cost Index (GPCI) adjustments.

The 2026 values below are national averages before any geographic adjustment, so your actual reimbursement will differ by locality.

72157 carries the same total RVUs in both settings, which is why the two totals above sit so close together. Plotted side by side, the money moves on the modifier rather than on the place of service.

Always verify current-year rates through the CMS tool before quoting patients or submitting claims. Commercial payers usually set rates as a percentage of Medicare, often 100-150%, but negotiated rates vary by contract. After submission, reconcile each electronic remittance advice against the fee schedule value you expected.

Modifiers that apply to 72157

Modifiers change how CPT code 72157 is reported and reimbursed. Applying the wrong modifier, or omitting a required one, is among the leading causes of radiology claim denials.

Medicare prefers XE, XS, XP, or XU modifiers over modifier -59, because they say more precisely why the services are distinct. When -59 applies, check whether one of the X-modifiers describes the clinical situation better before you submit.

ICD-10 diagnosis codes that support medical necessity

The ICD-10 code paired with CPT code 72157 must establish medical necessity for a thoracic spine MRI with and without contrast. Payers cross-check the diagnosis against their Local Coverage Determination (LCD) before approving the claim.

The same principle runs through the wider ICD-10-CM code reference. The diagnosis has to justify both the imaging modality and the contrast protocol chosen.

Pairing acceptability is payer-specific and governed by individual LCD policies. Check that your paired diagnosis maps to a covered indication under your MAC’s LCD for spinal MRI before the claim goes out.

Medical necessity and documentation requirements

The CMS Medicare Coverage Database sets out the national framework for medical necessity, while MAC-issued LCDs specify local indications for thoracic spine MRI.

Before ordering the study, the ordering physician should document why the combined without-and-with-contrast protocol is clinically necessary rather than the without-only or with-only variant.

Core documentation elements that must appear in the medical record to support a 72157 claim:

• Clinical indication: the specific signs, symptoms, or findings that justify thoracic spine MRI (e.g. progressive myelopathy, suspected demyelinating disease, known malignancy)
• Physician order: signed order naming the code or the study description, with ordering provider NPI and date
• Contrast rationale: why both pre- and post-contrast sequences are required (e.g. “to differentiate an active MS lesion from a stable plaque”)
• Relevant history: prior imaging results, lab findings, or specialist notes that support the study
• Radiologist report: structured report including clinical indication, technique (without then with contrast), findings, and impression
• Prior conservative treatment: for musculoskeletal indications, documentation that conservative care has been tried and failed, per most LCD requirements

Store these elements in the patient record rather than in a separate billing folder. An auditor asking for support on a 72157 claim wants the order, the indication, and the signed report in one place.

Prior authorization requirements

Most commercial payers require prior authorization for thoracic spine MRI, and that includes CPT code 72157. Traditional Medicare does not require it for MRI in general. Medicare Advantage plans set their own preauthorization rules, which vary by plan, so check with each payer before scheduling.

A prior authorization request should carry the same documentation elements listed above. Payers typically want the clinical indication, the ordering note, and any prior imaging that shows why the contrast study is now appropriate.

Denials for missing authorization rarely survive appeal, so tracking authorization status before the appointment protects the revenue.

72157 vs 72156 vs 72158: Choosing the right thoracic spine code

CPT codes 72156, 72157, and 72158 share the same contrast protocol, without followed by with contrast, but each applies to a different spinal region. Selecting the wrong code for the anatomy is a billing error, and payers catch it at adjudication.

A patient may have MRI of two adjacent spinal regions in one session, such as cervical and thoracic. Both codes may then be reported with appropriate modifiers, documenting each anatomical study separately.

Related spinal MRI codes

CPT code 72157 belongs to a family of spinal MRI codes separated by anatomical region and contrast status. Its nearest neighbor is 72146, which reports the same thoracic anatomy on a single non-contrast pass. That is the code a payer will expect when the contrast rationale is thin.

Billing tips that reduce 72157 denials

Denials on this code cluster around five avoidable errors. Each one is visible before submission, which is what makes a pre-submission check worth the minute it takes.

• Missing or wrong modifier: Confirm whether the radiologist bills globally, with -26, or whether the facility bills -TC separately. Billing the global rate when the radiologist is hospital-employed leads to overpayment recovery demands.
• Place of service mismatch: The POS code must match where the scan was performed, POS 11 for office and POS 22 for hospital outpatient. A mismatch triggers an automatic edit at the MAC level.
• Unsupported diagnosis: The paired ICD-10 code must appear on the payer’s covered diagnosis list for thoracic spine MRI. If M54.6 alone is insufficient, add specificity or pair a secondary code that strengthens the clinical picture.
• Missing prior authorization number: Include the authorization number in the appropriate claim field before submission. Submitting without it causes a denial even when authorization was obtained verbally.
• Incomplete radiologist report: Many payers require a signed, dated report before paying a radiology claim. Unsigned or preliminary reports at claim submission trigger medical record requests and delays.

Building a structured check that catches these errors before submission costs far less than working the denials afterward. Medicare is required to pay a clean electronic claim within 14 to 30 days. Most state prompt-pay laws give commercial payers 20 to 45 days. Every rework cycle pushes the payment past those windows.

How practice management software supports 72157 billing

Reference lookup tools such as AAPC, FindACode, and MDClarity tell you what CPT code 72157 means. They do not touch your claim submission workflow. A practice running a reference tool alongside a separate billing system retypes modifier selections, authorization numbers, and diagnosis codes between the two. That retyping is where errors enter.

Practice management software like Pabau removes that retyping by holding the clinical record, the modifier assignment, and the claim data in one system.

Pabau’s claims management software lets staff attach the authorization number directly to the encounter. An incomplete modifier field is flagged before the claim leaves the queue, and remittance advice is reconciled in the same place.

US claims route through Claim.MD, our clearinghouse partner, which validates submissions against thousands of payers and returns eligibility and remittance data alongside each claim. For a team billing 72157 weekly, a denial then surfaces as a task where the note was written.

Stop losing revenue to missed prior authorizations

Pabau’s claims management tools let your team track authorization status, flag outstanding approvals before imaging appointments, and submit cleaner 72157 claims with fewer denials.

Book a demo

Conclusion

Treat 72157 as a modifier question before you treat it as a rate question. The place of service barely changes what Medicare pays here. The decision that carries the money is whether you bill globally, professionally, or technically.

The other two decisions are settled before the scan happens. Pick the ICD-10 code that justifies contrast, not the one that merely describes the pain. Capture the authorization number while the appointment is still being booked. A team that fixes those three habits stops rebilling the same study twice.

The trade-off is that all three depend on the documentation reaching the claim intact, which separate systems make harder than it should be. Book a demo to see how Pabau connects the radiology record to the claim that bills it.

Continue your research

Need a framework for reducing radiology denials? Denial management in healthcare covers the structured workflow steps that prevent common claim rejections across imaging codes.

Want to understand the clearinghouse layer? Medical claims clearinghouse guide explains how electronic claims are scrubbed and routed before they reach payers.

Looking for broader billing compliance guidance? Medical billing compliance outlines the documentation and audit standards that apply to all outpatient procedure codes.

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