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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2018-03-29</periodOfReport>

    <dateOfOriginalSubmission>2018-04-02</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001561387</issuerCik>
        <issuerName>Health Insurance Innovations, Inc.</issuerName>
        <issuerTradingSymbol>HIIQ</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001366007</rptOwnerCik>
            <rptOwnerName>Telkamp Bruce</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O HEALTH INSURANCE INNOVATIONS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>15438 N. FLORIDA AVE., SUITE 201</rptOwnerStreet2>
            <rptOwnerCity>TAMPA</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33613</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CEO of HealthPocket, Inc.*</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-03-29</value>
                <footnoteId id="F1"/>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>16188</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>33688</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Due to a technical error, the reporting person's September 5, 2017 Form 4 was inadvertently re-filed today in lieu of a Form 4 for the March 29, 2018 transaction that was intended to be reported today.  This amended Form 4 is being filed to amend and restate the Form 4 to report the actual March 29, 2018 transaction.</footnote>
        <footnote id="F2">Represents grant of restricted shares pursuant to the terms of a Performance Share and Restricted Stock Award Agreement.  50% of the restricted shares will vest on January 1, 2019 and 50% will vest on January 1, 2020.</footnote>
    </footnotes>

    <remarks>*  HealthPocket, Inc. is a subsidiary of Issuer.</remarks>

    <ownerSignature>
        <signatureName>/s/ Michael Hershberger, Attorney-in-Fact for Bruce Telkamp</signatureName>
        <signatureDate>2018-04-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
