1 EXHIBIT 21 Subsidiaries of Registrant 2 SUBSIDIARIES OF WEBMD CORPORATION The following are the subsidiaries of WebMD Corporation, excluding subsidiaries the omission of which is permitted under Item 601(b)(21) of Regulation S-K: NAME STATE OF INCORPORATION ---- ---------------------- CareInsite Corporation Massachusetts Envoy Corporation Delaware Medical Manager Health Systems, Inc. Delaware WebMD, Inc. Georgia