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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-01-25</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001295949</rptOwnerCik>
            <rptOwnerName>Farha Todd S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O WELLCARE HEALTH PLANS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>8725 HENDERSON ROAD</rptOwnerStreet2>
            <rptOwnerCity>TAMPA</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33634</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman &amp;  CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

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        <nonDerivativeTransaction>
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                <sharesOwnedFollowingTransaction>
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                <sharesOwnedFollowingTransaction>
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                <sharesOwnedFollowingTransaction>
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                    <value>D</value>
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                <sharesOwnedFollowingTransaction>
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        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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                <value>2007-01-25</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>555</value>
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                <transactionPricePerShare>
                    <value>75.30</value>
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                <transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1071626</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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                    <value></value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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                    <value></value>
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        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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                <value>2007-01-25</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
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                <value></value>
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                    <value>124</value>
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                    <value>75.28</value>
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                <sharesOwnedFollowingTransaction>
                    <value>1071254</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2007-01-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
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                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>124</value>
                    <footnoteId id="F1"/>
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                <transactionPricePerShare>
                    <value>75.27</value>
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                    <value>D</value>
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                <sharesOwnedFollowingTransaction>
                    <value>1071130</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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                <natureOfOwnership>
                    <value></value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2007-01-25</value>
            </transactionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>372</value>
                    <footnoteId id="F1"/>
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                <transactionPricePerShare>
                    <value>75.26</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1070758</value>
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            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Planned sale pursuant to the Reporting Person's Rule 10b5-1 trading plan.</footnote>
    </footnotes>

    <remarks>1 of 2</remarks>

    <ownerSignature>
        <signatureName>/s/  Michael Haber, attorney-in-fact</signatureName>
        <signatureDate>2007-01-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
