Magnetic Resonance Imaging | CMS Coverage Update

Summary: The Centers for Medicare & Medicaid Services modified its Magnetic Resonance Imaging coverage policy, effective May 15, 2026. Here's what billing teams need to know before that date.

CMS MRI coverage policy changes affect a wide range of specialties — radiology, orthopedics, neurology, oncology, and cardiology among them. This modified policy does not list specific codes in the available policy data, so your first action is to pull the full policy text from the CMS source and verify how it maps to your current charge capture. The stakes here are high: MRI is one of the highest-volume imaging services billed to Medicare, and a missed coverage criterion means a denied claim and delayed reimbursement.

Quick-Reference Table

CMS Magnetic Resonance Imaging Coverage Criteria and Medical Necessity Requirements 2026

CMS MRI coverage policy is built on medical necessity. That's not new. What changes with each policy modification is how CMS defines and documents that necessity — which clinical conditions qualify, what documentation supports coverage, and where prior authorization requirements apply.

The available policy data for this modification does not include a detailed summary of the updated criteria. That means your billing team cannot rely on this post alone. Pull the full policy text directly from the CMS source before May 15, 2026, and compare it line-by-line against your current billing guidelines.

Here's what CMS MRI coverage policy has historically required as a baseline. Medicare covers MRI when the scan is medically necessary to diagnose or manage a specific condition. The ordering provider must document why an MRI — rather than a lower-cost imaging alternative — is the appropriate test for that patient at that time. Blanket orders, vague clinical indications, and missing documentation are the fastest path to a claim denial.

Prior authorization for MRI services under Medicare has been an expanding area of focus. The Protecting Access to Medicare Act (PAMA) created the Prior Authorization for Certain Hospital Outpatient Department (OPD) Services program. CMS has also rolled out the Appropriate Use Criteria (AUC) program for advanced imaging, which includes MRI. Under AUC, ordering providers must consult a qualified clinical decision support mechanism (CDSM) and include the AUC consultation results on the Medicare claim. If your team isn't already capturing AUC consultation codes on outpatient MRI claims, review this immediately.

Medical necessity documentation for MRI must be in the medical record before the service is billed — not reconstructed after a denial. Your coders need to verify that the ordering provider's notes contain a clear clinical indication, a documented reason the MRI is the appropriate imaging modality, and any relevant history that supports the decision.

Because this policy is a modification, the specific changes to coverage criteria, documentation requirements, or prior authorization thresholds are only visible in the updated policy text. Read the source. If you're not sure how the changes apply to your patient population or payer mix, talk to your compliance officer before May 15, 2026.

CMS MRI Exclusions and Non-Covered Indications

CMS does not cover MRI services that lack documented medical necessity. That's a policy constant, not a modification. But exclusions in MRI coverage policy often get more specific with each update — narrowing which indications qualify under which circumstances.

Historically, CMS has excluded or restricted MRI coverage in several categories. Screening MRI without a documented clinical indication is not covered. MRI for conditions where imaging will not change clinical management is not covered. Repeat MRI within a short interval without documented clinical change or new symptoms is often denied.

Patients with certain implanted devices — older pacemakers, cochlear implants, or metal implants that are not MRI-conditional — may face coverage restrictions tied to safety documentation requirements. Billing teams should verify that the medical record documents device compatibility, because a missing notation can turn a covered service into a claim denial.

Again: the specific exclusions in this modification are not available in the current policy data. Review the full policy text to identify any new non-covered indications added with this update.

Coverage Indications at a Glance

Because the policy data for this modification does not include a detailed indication-level breakdown, the table below reflects CMS's established MRI coverage framework. Verify each row against the updated policy text effective May 15, 2026.

All coverage statuses above are based on established CMS MRI coverage policy. Confirm any changes introduced by this May 2026 modification in the full policy text.

CMS MRI Billing Guidelines and Action Items 2026

The effective date is May 15, 2026. That's your deadline. Work backward from it.

CPT, HCPCS, and ICD-10 Codes for Magnetic Resonance Imaging Under This CMS Policy

The available policy data for this modification does not list specific CPT, HCPCS, or ICD-10 codes. Do not assume the code set is unchanged from the previous version.

Pull the full policy text from the CMS source and verify every code against your current charge master. If codes were added, removed, or reclassified in this modification, your charge capture and billing guidelines need to reflect those changes before May 15, 2026.

For reference, CMS MRI billing typically involves CPT codes in the 70000 series (brain and spine MRI), 71000 series (chest MRI), 73000 series (extremity MRI), and 74000 series (abdominal and pelvic MRI), along with HCPCS codes used for specific Medicare billing scenarios. The exact codes covered, excluded, or newly restricted under this modification are only available in the full policy document.

If your revenue cycle team uses a code-based workflow to flag claims for review, update that list as soon as you identify the relevant codes from the updated policy.