EXHIBIT 21.1

List of Subsidiaries



|                                              |  |                                   |  |            
|--------------------------------------------- |  | --------------------------------- |  | -----------
|Subsidiary                                    |  | State of Incorporation/ Formation |  | D/B/A      
|                                              |  |                                  
|1. Centrus Corporation                        |  | Delaware                          |  |            
|                                              |  |                                  
|2. Integrail Inc.                             |  | Delaware                          |  |            
|                                              |  |                                  
|3. Inteq Corp.                                |  | Delaware                          |  |            
|                                              |  |                                  
|4. Inteq PBM, L.P.                            |  | Texas                             |  |            
|                                              |  |                                  
|5. Inteq TX Corp.                             |  | Texas                             |  |            
|                                              |  |                                  
|6. Interchange PMP, Inc.                      |  | Oklahoma                          |  |            
|                                              |  |                                  
|7. National Medical Health Card IPA, Inc.     |  | New York                          |  | NMHCRX IPA 
|                                              |  |                                  
|8. NMHC Funding, LLC                          |  | Delaware                          |  |            
|                                              |  |                                  
|9. NMHC Group Solutions Insurance, Inc.       |  | Delaware                          |  |            
|                                              |  |                                  
|10. NMHCRX, Inc.                              |  | Delaware                          |  |            
|                                              |  |                                  
|11. NMHCRX Contracts, Inc                     |  | Delaware                          |  |            
|                                              |  |                                  
|12. NMHCRX Mail Order, Inc.                   |  | Delaware                          |  | NMHC Mail  
|                                              |  |                                  
|13. PBM Technology, Inc.                      |  | Delaware                          |  |            
|                                              |  |                                  
|14. PCN DE Corp.                              |  | Delaware                          |  |            
|                                              |  |                                  
|15. Pharmaceutical Care Network               |  | California                        |  | PCN        
|                                              |  |                                  
|16. Pharmacy Associates, Inc.                 |  | Arkansas                          |  |            
|                                              |  |                                  
|17. Portland Professional Pharmacy            |  | Maine                             |  | NMHC Ascend
|                                              |  |                                  
|18. Portland Professional Pharmacy Associates |  | Maine                             |  | NMHC Ascend
|                                              |  |                                  
|19. Specialty Pharmacy Care, Inc.             |  | New York                          |  |