Site of Care: High-tech Radiology - (0550) — MM 0550 | CIGNA Coverage Update

Cigna modified MM 0550, its site-of-care policy for high-tech radiology, effective September 26, 2025. If your patients receive MRI, MRA, CT, or CTA services billed through a hospital-based imaging department, this change affects your medical necessity documentation and prior authorization workflow.

Cigna Healthcare updated Coverage Policy MM 0550 to address when a hospital-based imaging department or facility is medically necessary for high-tech imaging services. The policy covers magnetic resonance imaging (MRI), magnetic resonance angiography (MRA), computed tomography (CT), and computed tomography angiography (CTA). The policy does not publish specific CPT codes in this version of the document — but make no mistake, if your team bills high-tech radiology for Cigna members in any care setting, this policy governs your reimbursement.

Quick-Reference Table

Cigna High-Tech Radiology Site-of-Care Coverage Criteria and Medical Necessity Requirements 2025

The core question MM 0550 answers is simple: when is it medically necessary to perform MRI, MRA, CT, or CTA in a hospital-based setting rather than a freestanding outpatient imaging center?

This matters because hospital-based imaging rates are significantly higher than freestanding facility rates. Cigna uses this Cigna high-tech radiology coverage policy to push back on hospital-based billing when a lower-cost site of care is clinically appropriate. That's the financial exposure your billing team needs to understand.

Under MM 0550, Cigna evaluates medical necessity at the site-of-care level — not just the procedure level. It's not enough to show the MRI itself is necessary. You also need to show why the hospital-based setting was the right place to perform it. If the clinical record doesn't support the site choice, Cigna can deny the facility component of the claim.

This is the policy's real leverage point. A freestanding imaging center can perform MRI and CTA just as effectively as a hospital outpatient department for most patients. Cigna knows this, and MM 0550 is the mechanism it uses to enforce lower-cost site selection.

What "Medical Necessity" Means Here

Medical necessity under MM 0550 applies to the setting, not just the scan. A patient may clearly need a brain MRI — but if that MRI could be safely and effectively performed at a freestanding center, Cigna may not consider the hospital-based setting medically necessary.

The clinical scenarios where hospital-based imaging is typically defensible include patients who require monitoring during the scan, patients on IV medications, patients whose condition could deteriorate, or patients who are already admitted or being evaluated in an emergency department. If none of those conditions apply, document carefully before billing hospital-based rates.

Your referring physicians and ordering providers need to understand this distinction. The medical necessity burden falls on the documentation in the clinical record — not on assumptions about standard practice.

Prior Authorization and MM 0550

Cigna frequently requires prior authorization for high-tech imaging services, and MM 0550 operates alongside those requirements. Prior auth for the procedure doesn't automatically validate the site of care. Cigna can approve the MRI and still deny the hospital-based facility claim if the site isn't separately justified.

If your team handles Cigna prior authorization for MRI, MRA, CT, or CTA, add a site-of-care justification step to your workflow now — before September 26, 2025. Don't wait for your first post-effective-date claim denial to discover that gap.

Coverage Indications at a Glance

The MM 0550 policy document does not publish a granular indication-by-indication breakdown. The policy addresses site-of-care medical necessity as a category decision across all four modalities. The table below reflects what the policy establishes.

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CPT, HCPCS, and ICD-10 Codes for High-Tech Radiology Under MM 0550

The MM 0550 policy document does not list specific CPT, HCPCS, or ICD-10 codes. This is a site-of-care policy that applies categorically across MRI, MRA, CT, and CTA services — rather than to a defined code set.

That said, your team should treat all MRI, MRA, CT, and CTA CPT codes billed to Cigna at hospital-based facility rates as subject to this policy. Standard high-tech radiology CPT codes affected in practice include MRI brain, spine, and extremity codes, MRA head and neck codes, CT brain and body codes, and CTA chest and abdomen codes. These procedures generate the facility charges where site-of-care medical necessity becomes the deciding factor in reimbursement.

A Note on Billing Without a Published Code List

When a payer publishes a coverage policy without an attached code list, that's often intentional. It gives the payer flexibility to apply the policy broadly. Don't assume that because your specific CPT code isn't listed, MM 0550 doesn't apply. If it's high-tech radiology billed to a Cigna plan at hospital-based rates, this policy is in play.

Your billing guidelines for Cigna high-tech radiology should reflect that the medical necessity standard now applies to both the procedure and the site. That's a documentation burden your team needs to prepare for.