##### 



Exhibit 21

SUBSIDIARIES OF THE REGISTRANT

The following are the subsidiaries of WebMD Corporation:

|                  |                                      |                                             |                                              |                                            |                   |          |  | 
|----------------- | ------------------------------------ | ------------------------------------------- | -------------------------------------------- | ------------------------------------------ | ----------------- | -------- |  | 
|Name              |                                      | Jurisdiction of Incorporation              
|                  |                                      |                                            
|WebMD Corporation |                                      | Delaware                                   
|                  | CareInsite Corporation               |                                             | Massachusetts                               
|                  |                                      | Care Acquisition Corp.                      |                                              | Delaware                                  
|                  |                                      | CareAgents, Inc.                            |                                              | Delaware                                  
|                  |                                      | Med-Link Technologies, Inc.                 |                                              | Delaware                                  
|                  |                                      | THINC Acquisition Corp.                     |                                              | Delaware                                  
|                  |                                      |                                             | THINC, LLC (1%)                              |                                            | New York         
|                  |                                      | THINC, LLC (99%)                            |                                              | New York                                  
|                  | Envoy Corporation                    |                                             | Delaware                                    
|                  |                                      | Envoy/ExpressBill, Inc.                     |                                              | Tennessee                                 
|                  |                                      | Kinetra LLC                                 |                                              | Delaware                                  
|                  |                                      |                                             | IMS  Net of Arkansas, Inc.                  |                                            | Arkansas         
|                  |                                      |                                             | IMS  Net of Central Florida, Inc.           |                                            | Colorado         
|                  |                                      |                                             | IMS  Net of Colorado, Inc.                  |                                            | Colorado         
|                  |                                      |                                             | IMS  Net of Illinois, Inc.                  |                                            | Illinois         
|                  |                                      |                                             |                                              | Illinois Medical Information Network, Inc. |                   | Illinois
|                  |                                      |                                             | Minnesota Medical Communication Network, LLC |                                            | Colorado         
|                  |                                      | National Electronic Information Corporation |                                              | Delaware                                  
|                  |                                      | WebMD Clinical Services, LLC                |                                              | Delaware                                  
|                  | Healtheon Software India Pvt. Ltd.   |                                             | India                                       
|                  | Healtheon/WebMD Cable Corporation    |                                             | Delaware                                    
|                  | Healtheon/WebMD Internet Corporation |                                             | Delaware                                    
|                  | HW International Holdings, Inc.      |                                             | Delaware                                    
|                  |                                      | WebMD International, LLC                    |                                              | Delaware                                  
|                  |                                      |                                             | WebMD Canada Ventures, Inc.                  |                                            | Canada           
|                  |                                      |                                             | WebMD UK Limited                             |                                            | England and Wales
|                  | HW Japan, Inc.                       |                                             | Delaware                                    
|                  | LaPook Lear Systems, Inc.            |                                             | New York                                    
|                  | MDNX Acquisition Corp.               |                                             | Florida                                     
|                  | MedEAmerica Corporation              |                                             | Delaware                                    
|                  |                                      | Healthcare Interchange, Inc.                |                                              | Missouri                                  
|                  |                                      | MedE America Corporation of Ohio            |                                              | Ohio                                      
|                  | Medical
Manager Health Systems, Inc. |                                             | Delaware                                    
|                  |                                      | Adaptive Health Systems of Arizona, Inc.    |                                              | Arizona                                   
|                  |                                      | Medical Manager PCN, Inc.                   |                                              | Delaware                                  
|                  |                                      |                                             | Benchmark Systems, Inc. of Louisiana         |                                            | Louisiana        
|                  |                                      | Medical Manager R & D                       |                                              | Florida                                   
|                  |                                      | Medical Manager Sales & Marketing           |                                              | California                                
|                  |                                      | Peachtree Associates, Inc.                  |                                              | Georgia                                   
|                  |                                      | Preferred System Solutions, Inc.            |                                              | Oklahoma                                  
|                  |                                      | TouchPoint Software Corporation             |                                              | Delaware                                  
|                  |                                      | United Software Architects, Inc.            |                                              | Texas                                     





---



##### 



| |                                 |                             |                                           |                                  |            |          |  | 
| | ------------------------------- | --------------------------- | ----------------------------------------- | -------------------------------- | ---------- | -------- |  | 
| | OnHealth Network Company        |                             | Washington                               
| |                                 | BabyData.com, Inc.          |                                           | Delaware                        
| |                                 | Demand Management, Inc.     |                                           | Colorado                        
| |                                 |                             | Health Decisions International, LLC (30%) |                                  | Colorado  
| |                                 | Health Decisions, Inc.      |                                           | Delaware                        
| |                                 |                             | Health Decisions International, LLC (70%) |                                  | Colorado  
| | The Ornish Health Program, Inc. |                             | California                               
| | PRX Holdings Corp.              |                             | Delaware                                 
| | SNTC Holdings, Inc.             |                             | Delaware                                 
| |                                 | Porex Holdings, Inc.        |                                           | Delaware                        
| |                                 |                             | Porex Bio Products, Inc.                  |                                  | Delaware  
| |                                 |                             | Porex Corporation                         |                                  | Delaware  
| |                                 |                             |                                           | Mupor Limited                    |            | England 
| |                                 |                             |                                           | Porex GmbH                       |            | Germany 
| |                                 |                             |                                           | Porex International, Inc.        |            | Barbados
| |                                 |                             |                                           | Porex Products Malaysia SDN, BHD |            | Malaysia
| |                                 |                             |                                           | Porex Surgical, Inc.             |            | Delaware
| |                                 |                             |                                           | Porex UK Ltd.                    |            | England 
| |                                 |                             | Porex Medical Products, Inc.              |                                  | California
| | SYN Healthcare Services, Inc.   |                             | California                               
| | SYNC Corp.                      |                             | New Jersey                               
| | WebMD Domain Corp.              |                             | Delaware                                 
| | WebMD, Inc.                     |                             | Georgia                                  
| |                                 | Endeavor Technologies, Inc. |                                           | Georgia                         
| |                                 | MMM Acquisition Company     |                                           | Delaware                        
| |                                 |                             | Medscape Portals, Inc.                    |                                  | Delaware  
| |                                 | Telemedics, Inc.            |                                           | Georgia                         
| |                                 | Wellmed, Inc.               |                                           | Delaware