The bipartisan bill is backed by more than 250 organizations, but ACMG remains opposed, arguing that ordering tests is part of the practice of medicine.
Scheduled to go into effect next year, CMS' price transparency regulations could drive down reimbursements but also streamline billing for hospital labs.
A pair of lawyers familiar with the case said that while ACLA might not win the legal battle, its lawsuit could aid efforts to get a legal fix to the law.
