The insurer and its law firm denies a doctor’s online claim that it refused to cover care for a cancer patient.

UnitedHealth Group has retained Clare Locke, a top defamation law firm, to battle what it describes as false and inaccurate social media allegations against its practices.

A doctor recently claimed on social media that UnitedHealth called her mid-surgery, denied her patient an overnight stay, and threatened legal action for her online posts about the incident after the ...