"Health care inflation is still front and center for a lot of organizations due to the higher cost driven by things like increased utilization, technological advances, prescription drug cost increases, and the list goes on," said Julie Gebauer, president of Health, Wealth & Career at Willis Towers Watson.

According to the lawsuit, the Labor Department issued the advisory opinion after Morgan Stanley launched an extensive campaign with its law firm.

"By tackling branded pharmas and equitable pricing strategies that have left Americans carrying the financial weight of global drug innovation, the government is helping to relieve a long-standing burden on U.S. consumers and businesses," David Joyner, the CVS chief executive officer, said.