In this article, we investigated the estimated cost to the Medicare program for covering psychotherapy services provided by marriage and family therapists (MFTs). Historical trends were identified by using psychotherapy cost and utilization data for the years 1999-2001. Using these trends, projections for the years 2002-2006 were made with MFTs included as providers. Employing this methodology, the 5-year estimated net increase and gross increase in cost due to the provision of psychotherapy services by MFTs was found to be approximately $10.5 million (or $2.1 million per year) and $13.9 million (or $2.8 million per year), respectively. This represents an increase of less than 1/2 of 1% of the Medicare mental health budget, and less than .0015% of Medicare expenditures overall.