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| NAME | STATE OF INCORPORATION | |
|---|---|---|
| CISI Business Corporation | Delaware | |
| 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 New Orleans, L.L.C. (doing business as Concentra Medical Centers) | Delaware | |
| 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 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 | |
| CRA Managed Care of Washington, Inc. | Washington | |
| CRA-MCO, Inc. | Nevada | |
| FHM Business Corporation | Delaware | |
| First Notice Systems, Inc. | Delaware | |
| FOCUS Healthcare Management, Inc. | Tennessee | |
| HealthNetwork Systems LLC | Delaware | |
| Managed Prescription Program Joint Venture | Arizona | |
| Medical Network Systems LLC | Delaware | |
| MetraComp, Inc | Connecticut | |
| National Healthcare Resources, Inc. | Delaware | |
| OccuCenters I, L.P. (doing business as Concentra Medical Centers; Concentra) | Texas | |
| 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 | |
| Tucson Occupational Medicine Partnership (doing business as Concentra Medical Centers) | Arizona |
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