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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2016-09-28</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001651561</issuerCik>
        <issuerName>Tabula Rasa HealthCare, Inc.</issuerName>
        <issuerTradingSymbol>TRHC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001384604</rptOwnerCik>
            <rptOwnerName>ORIGINATE GROWTH FUND 1A LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>205 WEBSTER STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BETHLEHEM</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>18015</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000902959</rptOwnerCik>
            <rptOwnerName>BRESSNER GLEN R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>205 WEBSTER STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BETHLEHEM</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>18015</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>37658</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Series A Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>472560</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series A-1 Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>302659</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series B Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>53912</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">All series of Preferred Stock will automatically convert into Tabula Rasa HealthCare, Inc. (the &quot;Issuer&quot;) common stock immediately prior to the closing of the initial public offering and have no expiration date.</footnote>
        <footnote id="F2">This report is filed jointly by Originate Growth Fund #1A, L.P. (&quot;Originate #1A&quot;), Originate Growth GP, LLC (&quot;Originate GP&quot;), Glen Bressner (&quot;Bressner&quot;), Eric Arnson (&quot;Arnson&quot;), and Michael Gausling (&quot;Gausling&quot;). Originate #1A is the record holder of 916,766 shares of Series A Preferred Stock, which will automatically convert into 472,560 shares of common stock upon the closing of the Issuer's initial public offering. Originate #1A is the record holder of 587,158 shares of Series A-1 Preferred Stock, which will automatically convert into 302,659 shares of common stock upon the closing of the Issuer's initial public offering. Originate #1A is the record holder of 104,589 shares of Series B Preferred Stock, which will automatically convert into 53,912 shares of common stock upon the closing of the Issuer's initial public offering.</footnote>
        <footnote id="F3">The shares are held by Originate #1A. The general partner of Originate #1A is Originate GP, a limited liability company. The members of Originate GP are Bressner, Arnson, and Gausling. The members of Originate GP share voting and dispositive power over the shares held by Originate #1A. Each of these individuals disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Originate Growth Fund #1A, L.P. By: Originate Growth  GP, LLC By: /s/ Glen Bressner, Managing Partner</signatureName>
        <signatureDate>2016-09-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Originate Growth  GP, LLC By: /s/ Glen Bressner, Managing Partner</signatureName>
        <signatureDate>2016-09-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Glen Bressner</signatureName>
        <signatureDate>2016-09-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Eric Arnson</signatureName>
        <signatureDate>2016-09-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Michael J. Gausling</signatureName>
        <signatureDate>2016-09-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
