Effective January 1, 2011, referring physicians (non-radiologists) who provide MRI, CT, and PET scans in their office practices will be required to make certain disclosures and provide information to their Medicare patients or risk violation of the Stark Law.[2] The Stark Law prohibits a physician from making referrals for designated health services (DHS) payable by Medicare to an entity in which the physician (or an immediate family member) has a financial relationship (ownership or compensation), unless an exception applies.[3] In addition, the Stark Law prohibits any provider from submitting claims for payment to Medicare for services provided as the result of a prohibited self-referral.[4] The Stark Law’s In-Office Ancillary Services Exception (IOASE) sets forth the exceptions that permit a physician in a solo or group practice to order and provide DHS in the office of the physician or practice group, provided that certain criteria are met.