A judge has ended two months of plaintiffs lawyers’ squabbling and picked two firms to take the lead in a class action potentially worth hundreds of millions of dollars against Aetna Health Inc.

U.S. District Judge Faith Hochberg in Newark, N.J., on Friday selected Pomerantz Haudek Grossman & Gross of New York to chair a seven-firm plaintiffs’ executive committee and coordinate the litigation, which accuses Aetna of underpaying reimbursements for out-of-network health care.