| Aetna Blue Cross
 BMS
 Cancer Treatment Centers
 Cardinal Health
 CareMark
 Eli Lilly
 Fortis Health
 Frazier Healthcare
 Humana
 Johnson and Johnson
 Kindred Healthcare
 
 | Lincare Mass Mutual
 Medicine Net
 MedJet Intl
 Merck
 Met Life
 Mutual Of Omaha
 Nationwide
 New York Life
 UHC
 United Health Group
 
 |