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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-11-07</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001602367</issuerCik>
        <issuerName>Adeptus Health Inc.</issuerName>
        <issuerTradingSymbol>ADPT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001611325</rptOwnerCik>
            <rptOwnerName>Sterling Capital Partners III, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O STERLING PARTNERS, 401</rptOwnerStreet1>
            <rptOwnerStreet2>NORTH MICHIGAN AVENUE, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001611318</rptOwnerCik>
            <rptOwnerName>SCP III AIV THREE-FCER Conduit, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O STERLING PARTNERS, 401</rptOwnerStreet1>
            <rptOwnerStreet2>NORTH MICHIGAN AVENUE, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001611319</rptOwnerCik>
            <rptOwnerName>SCP III AIV THREE-FCER, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O STERLING PARTNERS, 401</rptOwnerStreet1>
            <rptOwnerStreet2>NORTH MICHIGAN AVENUE, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001611317</rptOwnerCik>
            <rptOwnerName>SC Partners III, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O STERLING PARTNERS, 401</rptOwnerStreet1>
            <rptOwnerStreet2>NORTH MICHIGAN AVENUE, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001407214</rptOwnerCik>
            <rptOwnerName>Taslitz Steven</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O STERLING PARTNERS, 401</rptOwnerStreet1>
            <rptOwnerStreet2>NORTH MICHIGAN AVENUE, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001011186</rptOwnerCik>
            <rptOwnerName>ELFMAN MERRICK</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O STERLING PARTNERS, 401</rptOwnerStreet1>
            <rptOwnerStreet2>NORTH MICHIGAN AVENUE, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001072473</rptOwnerCik>
            <rptOwnerName>BECKER DOUGLAS L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O STERLING PARTNERS, 401</rptOwnerStreet1>
            <rptOwnerStreet2>NORTH MICHIGAN AVENUE, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001011193</rptOwnerCik>
            <rptOwnerName>HOEHN SARIC RULDOLF CHRISTOPHER</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O STERLING PARTNERS, 401</rptOwnerStreet1>
            <rptOwnerStreet2>NORTH MICHIGAN AVENUE, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001352791</rptOwnerCik>
            <rptOwnerName>Rosenberg Daniel</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O STERLING PARTNERS, 401</rptOwnerStreet1>
            <rptOwnerStreet2>NORTH MICHIGAN AVENUE, SUITE 3300</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Series A Preferred Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2016-11-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4313</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1000</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4313</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Series A Preferred Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2016-11-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3187</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1000</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3187</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On November 7, 2016, SCP III AIV THREE-FCER, L.P. and SCP III AIV THREE-FCER Conduit, L.P. purchased 4,313 and 3,187 newly issued shares of Series A Preferred Stock, par value $0.01, of the Company (&quot;Series A Preferred Stock&quot;) for an aggregate amount of $4,313,000 and $3,187,000, respectively.</footnote>
        <footnote id="F2">Shares of Series A Preferred Stock of the Issuer are held by SCP III AIV THREE-FCER, L.P.</footnote>
        <footnote id="F3">Shares of Series A Preferred Stock of the Issuer are held by SCP III AIV THREE-FCER Conduit, L.P.</footnote>
        <footnote id="F4">Sterling Capital Partners III, LLC is the general partner of SC Partners III, L.P., the general partner of each of SCP III AIV THREE-FCER, L.P. and SCP III AIV THREE-FCER Conduit, L.P. Messrs. Steven M. Taslitz, Merrick M. Elfman, Douglas L. Becker and R. Christopher Hoehn-Saric are the managers of Sterling Capital Partners III, LLC. Mr. Rosenberg also has an indirect interest in the securities of the Issuer reported herein.</footnote>
    </footnotes>

    <remarks>Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein, if any. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise, the Reporting Persons are the beneficial owners of any securities reported herein.</remarks>

    <ownerSignature>
        <signatureName>/s/ M. Avi Epstein, General Counsel of Sterling Capital Partners III, LLC, the general partner of SC Partners III, L.P., the general partner of SCP III AIV THREE-FCER, L.P.</signatureName>
        <signatureDate>2016-11-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ M. Avi Epstein, General Counsel of Sterling Capital Partners III, LLC, the general partner of SC Partners III, L.P., the general partner of SCP III AIV THREE-FCER Conduit, L.P.</signatureName>
        <signatureDate>2016-11-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ M. Avi Epstein, General Counsel of Sterling Capital Partners III, LLC, the general partner of SC Partners III, L.P.</signatureName>
        <signatureDate>2016-11-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ M. Avi Epstein, General Counsel of Sterling Capital Partners III, LLC</signatureName>
        <signatureDate>2016-11-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ M. Avi Epstein, attorney-in-fact for Steven M. Taslitz</signatureName>
        <signatureDate>2016-11-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ M. Avi Epstein, attorney-in-fact for Merrick M. Elfman</signatureName>
        <signatureDate>2016-11-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ M. Avi Epstein, attorney-in-fact for Douglas L. Becker</signatureName>
        <signatureDate>2016-11-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ M. Avi Epstein, attorney-in-fact for R. Christopher Hoehn-Saric</signatureName>
        <signatureDate>2016-11-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ M. Avi Epstein, attorney-in-fact for Daniel W. Rosenberg</signatureName>
        <signatureDate>2016-11-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
