1 EXHIBIT 21 LIST OF SUBSIDIARIES Name State of Organization - ---- --------------------- AdvancePCS, L.P. Delaware AdvancePCS Research, L.L.C. Delaware AdvanceRx.com, L.P. Delaware ADVP Consolidation, L.L.C. Delaware ADVP Management, L.P. Delaware Ambulatory Care Review Services, Inc. Ohio Baumel-Eisner Neuromedical Institute, Inc. Florida FFI Rx Managed Care, Inc. Florida First Florida International Holdings, Inc. Florida HMN Health Services, Inc. Ohio PCS Health Systems, Inc. Delaware PCS Holding Corporation Delaware PCS Mail Services, Inc. Arizona PCS Mail Services of Birmingham, Inc. Alabama PCS Mail Services of Ft. Worth, Inc. Delaware PCS Mail Services of Scottsdale, Inc. Arizona PCS Services, Inc. Delaware