<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-04-14</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001279363</issuerCik>
        <issuerName>WELLCARE HEALTH PLANS, INC.</issuerName>
        <issuerTradingSymbol>WCG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001253602</rptOwnerCik>
            <rptOwnerName>SPEP GENERAL PARTNER LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>888 SEVENTH AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>33RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10106</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001237660</rptOwnerCik>
            <rptOwnerName>QIH MANAGEMENT INVESTOR LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>888 SEVENTH AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>33RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10106</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001237658</rptOwnerCik>
            <rptOwnerName>QIH MANAGEMENT LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>888 SEVENTH AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>33RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10106</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001029160</rptOwnerCik>
            <rptOwnerName>SOROS FUND MANAGEMENT LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>888 SEVENTH AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>33RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10106</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000900203</rptOwnerCik>
            <rptOwnerName>SOROS GEORGE</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>888 SEVENTH AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>33RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10106</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <remarks>Effective as of April 14, 2005, (i) the entity formerly known as Soros Private Equity Investors LP, a Delaware limited partnership, changed its name to TowerBrook Investors L.P. (&quot;TBI&quot;); (ii) the entity formerly known as SPEP General Partner LP, a Delaware limited partnership, changed its name to TCP General Partner L.P. (&quot;TCP GP&quot;); and SPEP General Partner LLC, a Delaware limited liability company (&quot;SPEP GP LLC&quot;), ceased to be the general partner of TCP GP.  Reference is hereby made to a Form 3 to be filed on April 25, 2005 with respect to the Shares of the Issuer held for the account of TBI.  The filing of this statement shall not be deemed an admission that any of the Reporting Persons is the beneficial owner of any securities not held directly for its account for purposes of Section 16 of the Securities Act of 1934, as amended, or otherwise.  The following notes relate to the signatures for this statement:  (a) Richard D. Holahan, Jr. is signing in his capacity as Assistant General Counsel of SFM, the managing member of QIH Management LLC, the sole general partner of QIH Management Investor, L.P., the managing member of SPEP General Partner LLC.  (b) Richard D. Holahan, Jr. is signing in his capacity as Assistant General Counsel of SFM, the managing member of QIH Management LLC, the sole general partner of QIH Management Investor, L.P.  (c) Richard D. Holahan, Jr. is signing in his capacity as Assistant General Counsel of SFM, the managing member of QIH Management LLC.</remarks>

    <ownerSignature>
        <signatureName>Richard D. Holahan, Jr., SPEP General Partner LLC (a)</signatureName>
        <signatureDate>2005-04-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Richard D. Holahan, Jr., QIH Management Investor, L.P. (b)</signatureName>
        <signatureDate>2005-04-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Richard D. Holahan, Jr., QIH Management LLC (c)</signatureName>
        <signatureDate>2005-04-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Richard D. Holahan, Jr., as Assistant General Counsel of Soros Fund Management LLC</signatureName>
        <signatureDate>2005-04-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Richard D. Holahan, Jr., as Attorney-in-Fact for Mr. George Soros</signatureName>
        <signatureDate>2005-04-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
