UnitedHealth Says US Hiding Key Info in Suit Over Amedisys Deal

UnitedHealth Group Inc. and Amedisys Inc. are accusing the US of withholding key market information in its lawsuit seeking to block their $3.3 billion tie-up, which they argue should doom the case.

The Justice Department’s November challenge of UnitedHealth’s proposed acquisition of home health and hospice services provider Amedisys says the deal would stifle competition for home care in 23 states and Washington, D.C., and lead to higher prices.

But what’s “conspicuously missing” from the complaint is detailed information about relevant geographic areas where competition will be substantially lessened—a necessary component of antitrust merger actions—the companies argued Wednesday in the ...