The letter from Senator Grassley does not mention Fernando Mendez-Villamil by name, but it cites documents from the Florida Agency for Healthcare Administration about a prescriber who wrote 96,685 prescriptions for from the last quarter of 2007 through the first quarter of 2009 for Medicaid patients. Mendez-Villamil wrote nearly twice as many prescriptions for psychiatric drugs as the No. 2 Medicaid prescriber in the state.