Last fall, a group of physicians and three Colorado-based physician-owned companies that furnish cardiac catheterization services “under arrangement” to local hospitals filed a lawsuit in the United States District Court for the District of Columbia seeking to invalidate the “under arrangement” portion of the Stark regulations on the grounds that it is based on an impermissible interpretation of the Stark law and that CMS exceeded its statutory authority in enacting the new rule. On April 20, 2009, the court determined that it did not have jurisdiction over the claims asserted by the plaintiffs and dismissed the case. Colorado Heart Institute, LLC v. Johnson, No. 08-166-RMC (D.D.C. April 20, 2009).