The brain MRI CPT code is 70551, which describes a magnetic resonance imaging study of the brain without contrast material. This code is used to bill for non-contrast MRI scans performed to evaluate structural abnormalities, tumors, strokes, or degenerative conditions.
CPT code 70551 covers a complete MRI of the brain, including axial, coronal, and sagittal views. It includes interpretation and reporting by a radiologist. The procedure does not involve intravenous contrast agents, which distinguishes it from code 70553, used when contrast is administered.
According to the American Medical Association (AMA), CPT code 70551 applies to MRI exams that focus exclusively on the brain, excluding the orbits, spine, or neck. If additional areas are scanned, such as the cervical spine or internal auditory canals, separate codes may be required. The AMA's CPT® 2024 Professional Edition confirms this scope.
When a patient presents with headaches, seizures, or suspected neurological deficits, a physician may order a brain MRI. The imaging center performs the scan using a 1.5T or 3T magnet, acquiring multiple sequences such as T1-weighted, T2-weighted, and FLAIR. The radiologist reviews the images, identifies findings, and generates a formal report.
For billing, the healthcare provider submits claim form CMS-1500 or UB-04 with CPT code 70551. The code is assigned based on the actual procedure performed, not the reason for the exam. A diagnosis code such as G93.0 (for stroke) or Z00.00 (for routine screening) supports medical necessity.
A common error is using 70551 for scans that include the neck or spinal cord. For example, if a scan extends into the upper cervical spine, the correct code is 72148 (MRI of the cervical spine). Misuse leads to claim denials and audits.
Not all brain MRIs use the same CPT code. The choice depends on whether contrast is used and the extent of the scan.
| Code | Description | Use Case |
|---|---|---|
| 70551 | Brain MRI without contrast | Initial evaluation of headaches, trauma, or suspected mass |
| 70553 | Brain MRI with contrast | Evaluating tumors, infections, or inflammatory conditions |
| 70554 | Brain MRI with and without contrast | Complex cases requiring both phases, such as suspected metastases |
Code 70551 is often paired with modifier 26 (professional component only) when a radiologist interprets the scan but does not perform the imaging. Modifier 59 (distinct procedural service) may apply if the scan is done alongside another imaging test, such as a carotid ultrasound.
One frequent mistake is assuming that 70551 covers all MRI scans of the head. However, it excludes scans focused solely on the orbits, temporal bones, or pituitary gland. For those, different codes apply-such as 70555 for MRI of the orbits or 70556 for the sella turcica.
Another issue arises when providers submit 70551 for follow-up scans that were previously ordered. The code remains valid regardless of prior imaging, but payers may deny claims if the patient's history shows no change since the last scan. Documentation must justify clinical need.
A non-obvious point: 70551 does not include functional MRI (fMRI) or diffusion tensor imaging (DTI), which require separate codes. fMRI uses 70730, and DTI uses 70757. These are specialized techniques used in research or pre-surgical planning, not routine diagnostics.
A 45-year-old woman presents with daily headaches unresponsive to medication. Her neurologist orders a brain MRI to rule out structural causes. The scan is performed at a local imaging center using a 3T scanner. The protocol includes axial T1, T2, FLAIR, and DWI sequences. No contrast is used.
The radiologist reports: "No evidence of mass, hemorrhage, or acute infarction. Mild generalized cerebral atrophy consistent with aging." The facility bills CPT code 70551 with diagnosis code G44.1 (migraine without aura).
Insurance processes the claim. The payer denies coverage because the patient had a similar MRI six months ago. The provider appeals with updated clinical notes showing worsening symptoms and new onset of photophobia. The appeal succeeds due to documented progression.
This case illustrates that CPT code 70551 is valid for repeat scans when clinically justified. The key is supporting documentation-not just the code itself.
Brain MRI CPT code 70551 is a standard code for non-contrast MRI of the brain. It is widely used in outpatient clinics, emergency departments, and neurology practices. Accuracy in coding reduces claim denials and ensures proper reimbursement.
Always verify that the scan is limited to the brain. If the neck or spine is included, use a different code. Avoid confusion with functional or advanced sequences-those have their own CPT codes.