| Company | Portal | Disease Knowlegebase |
|---|---|---|
| AOL Time Warner | Health | Health publishing Inc. |
| Caremark Rx | Caremark.com | Thomson + CHI |
| Discovery | DiscoveryHealth | Healthanswers |
| Dr-I-Net.com Inc. | DrInet.com | n/a |
| Healthcommunities.com | Healthcommunities.com | n/a |
| Health Talk Interactive Inc. | Health Talk Interactive | self |
| Healthy.Net | Healthy.Net | self |
| Aetna-InteliHealth Inc. | Intelihealth | Harvard |
| GE: NBC: iVillage Inc. | iVillage Health | self |
| Mayo Clinic | Health Oasis | Mayo Clinic |
| MDChoice Inc. | MDChoice.com/ HealthCentral | gov agencies |
| MediResorce Inc. | Medbroadcast.com | Mediresource |
| Medco Health Solutions | Medco Health | McKesson |
| Online Medical Network Inc. | MDAdvice.com | Medical data exchange |
| Telemedical.com | Your Telemedical Office | multiple |
| WebMD | WebMD + MedicineNet | Healthwise + self |
| Yahoo | Yahoo Health | Adam |