MRI Code Guide: Common MRI CPT Codes by Body Part

Every MRI CPT code follows the same underlying logic, but with dozens of body parts, contrast combinations, and modifier rules stacked on top of each other, it's easy to bill the wrong one - and an incorrect MRI code is one of the fastest ways to trigger a denial or an overpayment recoupment. This guide walks through the MRI code you'll need for the most commonly imaged body regions, how contrast changes the code, and the modifiers that keep MRI claims compliant. MRI CPT (Current Procedural Terminology) codes are organized in the AMA's Radiology section and follow a consistent pattern for most body regions: a "without contrast" code, a "with contrast" code, and a "without followed by with contrast" code. Below you'll find the most common MRI codes by body region, the contrast rules that determine which one to bill, and the modifiers and mistakes that most often cause claim denials.

What Is an MRI Code, and Why Does the Contrast Pattern Matter?

An MRI code is a five-digit CPT code that tells the payer exactly which body region was imaged and whether contrast material - typically a gadolinium-based dye - was used. The American Medical Association assigns these codes, and for most body regions, three related codes form a predictable pattern:

• Without contrast - a single set of images with no dye
• With contrast - a single set of images after dye is injected
• Without followed by with contrast - two full sets of images, one before and one after dye injection, used for comparison

Choosing the wrong one of these three - especially billing the "without and with" code when only one set of images was actually performed - is one of the most common and most easily prevented MRI billing errors.

Common MRI CPT Codes by Body Part

Brain and Head MRI Codes

Spine MRI Codes

Chest, Abdomen, and Pelvis MRI Codes

Extremity and Joint MRI Codes

Breast, Cardiac, and Other Common MRI Codes

Contrast Rules: How to Pick the Right MRI Code

1. Confirm what was actually performed from the radiology report - not the order - before assigning a code. The order may request "with and without contrast," but if only one set of images was obtained, that code doesn't apply.
2. Use the "without and with contrast" code only when both a pre-contrast and post-contrast set of images were performed in the same session.
3. Never bill a "without contrast" code and a "with contrast" code separately for the same session when the "without-and-with" combination code exists and applies - that combination is a single code, not two.
4. Check payer-specific prior authorization requirements, especially for higher-cost combination studies like 70553 or 72158, since many commercial and Medicare Advantage plans require prior authorization before the exam is performed. CMS's own National Coverage Determination for Magnetic Resonance Imaging (NCD 220.2) is the starting point for understanding which MRI indications are nationally covered versus left to local contractor discretion.

Modifiers That Matter for MRI Billing

• Modifier 26 - Indicates the professional component only (the radiologist's interpretation), used when a different entity bills the technical work separately.
• Modifier TC - Indicates the technical component only (equipment, supplies, technologist time), used when the professional interpretation is billed separately.
• RT / LT - Required for MRI of paired structures (like extremities) to indicate which side was imaged.
• Modifier 59 - Used when two MRI procedures that would normally be bundled were performed as distinct, separately documented studies - for example, two different, unrelated body areas imaged in the same session. Always check the current CMS National Correct Coding Initiative (NCCI) edits before applying it.
• Multiple procedure reduction - When more than one MRI is performed in the same session, most payers apply a reduced payment rate to the lower-valued technical component rather than denying the second study outright.

Common MRI CPT Code Mistakes to Avoid

• Billing the "without and with contrast" code when the report only documents one contrast phase
• Coding from the order instead of the final radiology report, which can misstate what was actually performed
• Missing RT/LT modifiers on extremity and joint studies
• Failing to check prior authorization requirements before the exam, leading to denials that can't be appealed after the fact
• Not applying the multiple procedure reduction correctly when more than one MRI is billed for the same session

These same denial patterns - missing modifiers, documentation gaps, and skipped authorization checks - are exactly what payers flag in post-payment reviews. Practices running other Medicare-audited programs alongside imaging will recognize the pattern from our RPM audit checklist for avoiding Medicare recoupments. Denials also spike when a patient's imaging coincides with a hospital discharge, and the diagnosis coding doesn't line up - see our ICD-10 codes for transition of care reference guide for that specific scenario.

Where MRI Billing Connects to Chronic Care Management

Circle Health does not manage MRI or radiology billing directly - that's not its role, and this guide isn't meant to suggest otherwise. But many patients who need repeat or surveillance MRIs - for multiple sclerosis, cancer follow-up, or chronic musculoskeletal conditions - are also managing other chronic conditions in parallel: diabetes, hypertension, heart failure. Those chronic conditions qualify for separate Medicare care coordination programs, such as Chronic Care Management (CCM) and Remote Patient Monitoring (RPM), that run alongside - not instead of - the imaging and radiology billing described above. For health systems and multi-speciality practices already coordinating the whole patient, these programs represent additional, compliant recurring revenue built around the chronic conditions that same MRI patient is already being treated for, run through Circle Health. If your practice coordinates imaging alongside chronic disease management, our guide on 15 common chronic illness examples and how they're managed long-term is a useful companion read. Practices managing complex medication regimens around a contrast-enhanced MRI may also find our guide on CPT codes for medication reconciliation useful.

Conclusion

MRI coding comes down to two consistent decisions: matching the code to the body region actually imaged, and matching the contrast code to what the radiology report documents - not what the order requested. Get those two things right, apply RT/LT and modifier 59 correctly, and check prior authorization and bundling rules before the claim goes out, and most MRI denials become preventable.

MRI codes, NCCI edits, and prior authorization requirements are reviewed by CMS and commercial payers on a regular cycle, so treat this guide as a starting reference rather than a final word. Always verify current codes and coverage criteria against the latest CMS and AMA publications, and loop in your billing team or a certified coder whenever a study doesn't fit neatly into the categories above. Practices running a CCM program alongside imaging should also review how to prepare for a CMS CCM audit, since the documentation discipline that protects an MRI claim also protects a CCM claim.

Frequently Asked Questions

What is the difference between an MRI code with and without contrast?

The "without contrast" code covers a single set of images with no dye. The "with contrast" code covers images after dye injection, while "without and with contrast" includes both pre-contrast and post-contrast images in the same session.

What CPT code is used for a knee MRI?

A knee MRI is billed using lower extremity joint codes: 73721 without contrast, 73722 with contrast, or 73723 without and with contrast. Use RT or LT modifiers to indicate laterality.

When should modifier 26 or TC be used on an MRI claim?

Use modifier 26 when you bill only the radiologist's professional interpretation. Use modifier TC when you bill only the technical component, including equipment and technologist time.

Why do MRI claims get denied so often?

Common causes include using a contrast combination code when only one phase was performed, coding from the order instead of the final report, missing laterality modifiers, and failing to secure prior authorisation before the exam. Diagnosis coding inconsistencies can also contribute to denials.

How can Circle Health help?

While Circle Health does not manage MRI or radiology billing directly, its AI-powered care management platform supports physician groups, health systems, and multi-specialty practices with CCM, RPM, PCM, BHI, and TCM programmes for patients with chronic or complex conditions.