Changes to the federal Stark law that affect diagnostic imaging arrangements.

The Omnibus Budget Reconciliation Act of 1989 included an effort to prohibit self-referrals for services that has come to be known as the Stark law. Since its passage, the law has been modified a number of times to clarify ambiguity and address loopholes. This article describes changes made in 2007, specifically focusing on how those changes affect physicians who provide and refer for imaging services.