By Elise Viebeck - 11/14/12 06:54 PM EST
"We write to you today because we believe more information is needed to determine whether QSSI will be able to act effectively in this role in a fair and transparent manner," Upton and Stearns wrote to Health and Human Services Secretary Kathleen Sebelius.
Sen. Orrin Hatch (R-Utah) has also expressed concerns over UnitedHealth Group's purchase of QSSI. Another critic compared the deal to the New York Yankees buying off their umpires in a conversation with The Hill.
A senior executive with Optum, the subsidiary of UnitedHealth Group, which bought QSSI, said his firm and UnitedHealthcare are entirely separate businesses.