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Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT The following are the subsidiaries of WebMD Corporation: Name
    
    Jurisdiction of IncorporationWebMD Corporation
    
    DelawareAdvanced Business Fulfillment, Inc.
    
    MissouriCLD Corporation
    
    DelawareEnvoy Corporation
    
    DelawareCareInsite LLC
    
    MassachusettsTHINC, LLC (99%)
    
    New YorkTHINC Acquisition Corp.
    
    DelawareTHINC, LLC (1%)
    
    New YorkClaims Processing Service, Inc.
    
    ConnecticutEnvoy/ExpressBill, Inc.
    
    TennesseeKinetra LLC
    
    DelawareIMS  Net of Arkansas, Inc.
    
    ArkansasIMS  Net of Central Florida, Inc.
    
    ColoradoIMS  Net of Colorado, Inc.
    
    ColoradoIMS  Net of Illinois, Inc.
    
    IllinoisIllinois Medical Information Network, Inc.
    
    IllinoisMinnesota Medical Communication Network, LLC
    
    ColoradoMediFAX-EDI Holding Company
    
    DelawareMediFAX-EDI LLC
    
    TennesseeMedi, Inc.
    
    CaliforniaMediFAX, Inc.
    
    TennesseeMedware Solutions, Inc.
    
    FloridaMediFAX-EDI Holdings, Inc.
    
    DelawareMediFAX-EDI Services, Inc.
    
    DelawareNational Electronic Information Corporation
    
    DelawareWebMD Clinical Services, LLC
    
    DelawareHealtheon Software India Pvt. Ltd.
    
    IndiaHealtheon/WebMD Cable Corporation
    
    DelawareHealtheon/WebMD Internet Corporation
    
    DelawareHW International Holdings, Inc.
    
    DelawareWebMD International, LLC
    
    DelawareWebMD Canada Ventures, Inc.
    
    CanadaWebMD UK Limited
    
    England and WalesHW Japan, Inc.
    
    DelawareLaPook Lear Systems, Inc.
    
    New YorkMDNX Acquisition Corp.
    
    FloridaMedEAmerica Corporation
    
    DelawareHealthcare Interchange, Inc.
    
    MissouriMedE America Corporation of Ohio
    
    OhioOnHealth Network Company
    
    WashingtonBabyData.com, Inc.
    
    DelawareDemand Management, Inc.
    
    ColoradoHealth Decisions International, LLC (30%)
    
    ColoradoHealth Decisions, Inc.
    
    DelawareHealth Decisions International, LLC (70%)
    
    ColoradoThe Ornish Health Program, Inc.
    
    CaliforniaPRX Holdings Corp.
    
    DelawareSNTC Holding, Inc.
    
    DelawarePorex Corporation
    
    DelawareMupor Limited
    
    EnglandPorex GmbH
    
    GermanyPorex International, Inc.
    
    BarbadosPorex Products Malaysia SDN, BHD
    
    MalaysiaPorex Surgical Inc.
    
    DelawarePorex Surgical GmbH
    
    GermanySYN Healthcare Service, Inc.
    
    CaliforniaSYNC Corp.
    
    New JerseyWebMD Domain Corp.
    
    Delaware




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Name
    
    Jurisdiction of IncorporationWebMD, Inc.
    
    GeorgiaEndeavor Technologies, Inc.
    
    GeorgiaMMM Acquisition Company
    
    DelawareMedscape Portals, Inc.
    
    DelawareMDhub, LLC
    
    ConnecticutNational Physicians DataSource, LLC
    
    ConnecticutOW Corp
    
    DelawarePhysicians Telephone Directory, Inc.
    
    ConnecticutTelemedics, Inc.
    
    GeorgiaWellmed, Inc.
    
    DelawareWebMD Practice Services, Inc.
    
    DelawareAdaptive Health Systems of Arizona, Inc.
    
    ArizonaMAS Subsidiary, Inc.
    
    DelawareMedical Manager PCN, Inc.
    
    DelawareBenchmark Systems, Inc. of Louisiana
    
    LouisianaMedical Manager Research & Development, Inc.
    
    FloridaMedical Manager Sales & Marketing, Inc.
    
    CaliforniaPeachtree Associates, Inc.
    
    GeorgiaPersonal Best!, Inc.
    
    North CarolinaPreferred System Solutions, Inc.
    
    OklahomaTouchPoint Software Corporation
    
    DelawareUnited Software Architects, Inc.
    
    Texas