Exhibit 21.1

SUBSIDIARIES



|                                                                                                 |  |                      
|------------------------------------------------------------------------------------------------ |  | ---------------------
|NAME                                                                                             |  | STATE OFINCORPORATION
|Beech Street Corporation                                                                         |  | California           
|Beech Street Corporation                                                                         |  | Delaware             
|BestCare, Inc.                                                                                   |  | Louisiana            
|CM Occupational Health, Limited Liability Company                                                |  | Maine                
|Concentra Akron, L.L.C.                                                                          |  | Delaware             
|Concentra Arkansas, L.L.C. (doing business as Concentra Medical Centers)                         |  | Delaware             
|Concentra Birmingham, L.L.C. (doing business as Concentra Medical Centers)                       |  | Delaware             
|Concentra Health Services, Inc. (doing business as Concentra Medical Centers)                    |  | Nevada               
|Concentra Integrated Services, Inc.                                                              |  | Massachusetts        
|Concentra Laboratory, L.L.C. (doing business as Advanced Toxicology Network)                     |  | Delaware             
|Concentra Management Services, Inc.                                                              |  | Nevada               
|Concentra Network Services, Inc.                                                                 |  | Nevada               
|Concentra Occupational Healthcare Harrisburg, L.P. (doing business as Concentra Medical Centers) |  | Pennsylvania         
|Concentra Preferred Systems, Inc.                                                                |  | Delaware             
|Concentra St. Louis, L.L.C. (doing business as Concentra Medical Centers)                        |  | Delaware             
|Concentra Services, Inc.                                                                         |  | Nevada               
|Concentra South Carolina, L.L.C. (doing business as Concentra Medical Centers)                   |  | Delaware             
|Concentra-UPMC, L.L.C. (doing business as Concentra Medical Centers)                             |  | Delaware             
|Concentra Vanderbilt, L.L.C. (doing business as Concentra Medical Centers)                       |  | Delaware             
|Concentra Winston-Salem, L.L.C. (doing business as Concentra Medical Centers)                    |  | Delaware             
|CPS Business Corporation                                                                         |  | Delaware             
|FHM Business Corporation                                                                         |  | Delaware             
|First Script Network Services, Inc.                                                              |  | Nevada               
|FOCUS Healthcare Management, Inc.                                                                |  | Tennessee            
|Healthcare Network Services Corporation                                                          |  | Delaware             
|HealthNetwork Systems LLC                                                                        |  | Delaware             
|Kent/OH+R, LLC                                                                                   |  | Rhode Island         
|Managed Prescription Program                                                                     |  | Arizona              
|MetraComp, Inc.                                                                                  |  | Connecticut          
|National Healthcare Resources, Inc.                                                              |  | Delaware             
|OccuCenters I, L.P. (doing business as Concentra Medical Centers; Concentra)                     |  | Texas                
|Occupational Health + Rehabilitation LLC                                                         |  | Delaware             
|Occupational Health Ventures, L.L.C. (doing business as Concentra Medical Centers)               |  | Pennsylvania         
|OCI Holdings, Inc.                                                                               |  | Nevada               
|OHC of Oklahoma, L.L.C. (doing business as Concentra Medical Centers)                            |  | Oklahoma             
|OHR/Baystate, LLC                                                                                |  | Massachusetts        
|OHR/MMC, Limited Liability Company                                                               |  | Maine                
|OMP Insurance Company, Ltd.                                                                      |  | Cayman Islands