
Quick Summary: New Legal Challenge to IDR Use by Providers
A Pattern of Dispute and Pushback Strategy
UnitedHealthcare, the largest health insurer in the country, filed a lawsuit in August 2025 against Radiology Partners, the nation’s largest radiology group, accusing the provider of manipulating the Independent Dispute Resolution (IDR) process under the No Surprises Act. The suit, filed in federal court in Arizona, claims Radiology Partners used a separate out-of-network entity—Sonoran Radiology—to submit claims for services actually performed by in-network physicians, allegedly to generate higher reimbursements through arbitration.
Radiology Partners, headquartered in El Segundo, CA, employs over 4,000 radiologists and has acquired multiple Arizona imaging practices, including Scottsdale Medical Imaging and Sun City Imaging, which had contracts with UnitedHealthcare. According to the complaint, Radiology Partners created Sonoran Radiology in 2019 with different billing credentials. After the No Surprises Act took effect, UnitedHealthcare alleges that Radiology Partners began billing services under Sonoran’s out-of-network tax ID—despite the work being performed by doctors from in-network entities—then sought arbitration for underpayment of those claims.
This is not UnitedHealthcare’s first legal action against Radiology Partners. Earlier this year, an arbitration panel vacated a $134 million award previously granted to the radiology group, adding further tension between the two entities. The current lawsuit seeks to vacate prior arbitration awards, block future claims from Sonoran Radiology, and recoup payments made under the disputed circumstances.
You can read more about the lawsuit from Benefits Pro.
Why This Matters to Your Practice
UnitedHealthcare’s legal challenge illustrates the intensifying scrutiny over how providers use the IDR process. Providers must be vigilant:
At Patriot Group, we understand the complex regulatory framework of the No Surprises Act and the challenges providers face in asserting their rights through the IDR process. Our team works closely with healthcare organizations to ensure compliance, defend against insurer disputes, and secure appropriate reimbursement.
Patriot Group can help your organization maximize IDR outcomes and defend against payer tactics that threaten revenue.
Contact Thomas J. Force, Esq., President and Founder of Patriot Group at [email protected] or call (631) 870-4040 to protect your practice and ensure you get paid what you deserve.