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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2022-06-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001472595</issuerCik>
        <issuerName>R1 RCM Holdco Inc.</issuerName>
        <issuerTradingSymbol>NONE</issuerTradingSymbol>
    </issuer>

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            <rptOwnerCik>0001187572</rptOwnerCik>
            <rptOwnerName>HENNEMAN JOHN B III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O R1 RCM INC.</rptOwnerStreet1>
            <rptOwnerStreet2>434 W. ASCENSION WAY, 6TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>MURRAY</rptOwnerCity>
            <rptOwnerState>UT</rptOwnerState>
            <rptOwnerZipCode>84123</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
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            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On June 21, 2022, pursuant to the Transaction Agreement and Plan of Merger, dated as of January 9, 2022, by and among R1 RCM Holdco Inc. (f/k/a R1 RCM Inc.) (the &quot;Company&quot;), R1 RCM Inc. (f/k/a Project Roadrunner Parent Inc.) (&quot;New R1&quot;), Project Roadrunner Merger Sub Inc. (&quot;R1 Merger Sub&quot;), CoyCo 1, L.P., CoyCo 2, L.P. and certain other parties, R1 Merger Sub was merged with and into the Company, with the Company surviving as a direct, wholly owned subsidiary of New R1 (the &quot;Reorganization&quot;).</footnote>
        <footnote id="F2">Upon consummation of the Reorganization, each share of the Company's common stock issued and outstanding immediately prior to the Reorganization was automatically exchanged into an equivalent corresponding share of common stock of New R1 and the Company's stockholders became stockholders of New R1. In addition, each restricted stock unit (&quot;RSU&quot;) and option to purchase shares of common stock of the Company issued and outstanding immediately prior to the Reorganization was automatically exchanged into an equivalent corresponding RSU or option to purchase shares of common stock of New R1, subject to the same terms and conditions (including applicable vesting terms) as were applicable to RSUs or options to purchase shares immediately prior to the consummation of the Reorganization.</footnote>
        <footnote id="F3">Option was granted under a stock incentive plan, in a transaction exempt under Rule 16(b)-3. The option is fully vested.</footnote>
        <footnote id="F4">Option was granted in lieu of retainer fees of $15,000 under a stock incentive plan, in a transaction exempt under Rule 16(b)-3. The option is fully vested.</footnote>
        <footnote id="F5">Option was granted in lieu of retainer fees of $15,000 under a stock incentive plan, in a transaction exempt under Rule 16(b)-3. The option will vest in one installment on July 1, 2022.</footnote>
        <footnote id="F6">Option was granted in lieu of retainer fees of $15,000 under a stock incentive plan, in a transaction exempt under Rule 16(b)-3. The option will vest in one installment on October 1, 2022.</footnote>
        <footnote id="F7">Option was granted in lieu of retainer fees of $15,000 under a stock incentive plan, in a transaction exempt under Rule 16(b)-3. The option will vest in one installment on January 3, 2023.</footnote>
        <footnote id="F8">Option was granted in lieu of retainer fees of $22,500 under a stock incentive plan, in a transaction exempt under Rule 16(b)-3. The option will vest in one installment on April 1, 2023.</footnote>
        <footnote id="F9">Each RSU represents a contingent right to receive one share of the Company's common stock.</footnote>
        <footnote id="F10">The RSUs will vest in one annual installment on May 27, 2023.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ E. Terry Platis, Attorney-in-Fact</signatureName>
        <signatureDate>2022-06-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
