Health care providers that bill Medicare for Part B mental health services should take special heed of a March 28 program memorandum from the Centers for Medicare & Medicaid Services (AB-03-037; http://cms.hhs.gov/manuals/pm_trans/AB03037.pdf). The memo is designed to help providers master the intricacies of mental health billing and documentation rules - an urgent compliance risk area highlighted in a number of recent reports from the HHS Office of Inspector General. In other recent program memoranda, CMS: