<SEC-DOCUMENT>0001598100-20-000007.txt : 20200316
<SEC-HEADER>0001598100-20-000007.hdr.sgml : 20200316
<ACCEPTANCE-DATETIME>20200316160642
ACCESSION NUMBER:		0001598100-20-000007
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20200312
FILED AS OF DATE:		20200316
DATE AS OF CHANGE:		20200316

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Reddy Sundeep G.
		CENTRAL INDEX KEY:			0001747579

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13252
		FILM NUMBER:		20717132

	MAIL ADDRESS:	
		STREET 1:		6555 NORTH STATE HWY 161
		CITY:			IRVING
		STATE:			TX
		ZIP:			75039

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MCKESSON CORP
		CENTRAL INDEX KEY:			0000927653
		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-DRUGS PROPRIETARIES & DRUGGISTS' SUNDRIES [5122]
		IRS NUMBER:				943207296
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		6555 STATE HIGHWAY 161
		CITY:			IRVING
		STATE:			TX
		ZIP:			75039
		BUSINESS PHONE:		972-446-4800

	MAIL ADDRESS:	
		STREET 1:		6555 STATE HIGHWAY 161
		CITY:			IRVING
		STATE:			TX
		ZIP:			75039

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MCKESSON HBOC INC
		DATE OF NAME CHANGE:	19990115

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MCKESSON CORP
		DATE OF NAME CHANGE:	19950209

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SP VENTURES INC
		DATE OF NAME CHANGE:	19940728
</SEC-HEADER>
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<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-03-12</periodOfReport>

    <issuer>
        <issuerCik>0000927653</issuerCik>
        <issuerName>MCKESSON CORP</issuerName>
        <issuerTradingSymbol>MCK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001747579</rptOwnerCik>
            <rptOwnerName>Reddy Sundeep G.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6555 STATE HWY 161</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>IRVING</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75039</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>SVP &amp; Controller</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-03-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>37</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1231</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On February 10, 2020, McKesson Corporation (NYSE:MCK) commenced an exchange offer (the &quot;exchange offer&quot;) related to the split-off of its wholly-owned subsidiary, PF2 Spinco, Inc. (&quot;SpinCo&quot;), which then held, directly or indirectly, all of McKesson's interests in Change Healthcare LLC (&quot;Change Healthcare&quot;), as part of McKesson's previously announced agreement with Change Healthcare Inc. (Nasdaq:CHNG) (&quot;Change&quot;) to merge SpinCo with and into Change. In the exchange offer, McKesson offered to exchange 175,995,192 shares of SpinCo common stock, par value $0.001 per share (&quot;SpinCo Common Stock&quot;), which represented all of the shares of SpinCo Common Stock that were then outstanding, for outstanding shares of McKesson common stock, par value $0.01 per share (&quot;McKesson Common Stock&quot;), that were tendered and accepted, as described in further detail in SpinCo's prospectus - offer to exchange dated February 28, 2020 (the &quot;Prospectus - Offer to Exchange&quot;).</footnote>
        <footnote id="F2">The number of shares of McKesson Common Stock reported reflects the total tendered by and accepted from the reporting person, based on a final proration factor with approximately 14.82 % for the exchange offer, which was announced on March 12, 2020, the day after the day on which the guaranteed delivery period for the exchange offer ended.</footnote>
        <footnote id="F3">In the exchange offer, each share of SpinCo Common Stock owned by McKesson was exchanged for shares of McKesson Common Stock at a ratio of 11.4086 shares of SpinCo Common Stock for each share of McKesson Common Stock tendered and accepted in such offer</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Laura Heiman, Attorney-in-fact</signatureName>
        <signatureDate>2020-03-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
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</SEC-DOCUMENT>
