    <SEC-DOCUMENT>0001093557-21-000097-index.html : 20210326
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    <ACCEPTANCE-DATETIME>20210326160812
    ACCESSION NUMBER:		0001093557-21-000097
    CONFORMED SUBMISSION TYPE:	PRE 14A
    PUBLIC DOCUMENT COUNT:		45
    CONFORMED PERIOD OF REPORT:	20210520
    FILED AS OF DATE:		20210326
    DATE AS OF CHANGE:		20210326

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			DEXCOM INC
    		CENTRAL INDEX KEY:			0001093557
    		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
    		IRS NUMBER:				330857544
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		PRE 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-51222
    		FILM NUMBER:		21777379

    	BUSINESS ADDRESS:
    		STREET 1:		6340 SEQUENCE DRIVE
    		CITY:			SAN DIEGO
    		STATE:			CA
    		ZIP:			92121
    		BUSINESS PHONE:		8582000200

    	MAIL ADDRESS:
    		STREET 1:		6340 SEQUENCE DRIVE
    		CITY:			SAN DIEGO
    		STATE:			CA
    		ZIP:			92121
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    <FILENAME>dxcm-2021xpredef14aproxy_a.htm
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    Document 1 - file: dxcm-2021xpredef14aproxy_a.htm

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    <FILENAME>auditcommittee3.jpg
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    Document 3 - file: auditcommittee3.jpg

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    <FILENAME>bedependable1.jpg
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    Document 4 - file: bedependable1.jpg

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    Document 5 - file: boardmonitoring1.jpg

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    Document 6 - file: cash1.jpg

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    Document 7 - file: ceovsneochart1.jpg

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    Document 12 - file: clock1.jpg

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    <FILENAME>compcommittee3.jpg
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    Document 13 - file: compcommittee3.jpg

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    Document 14 - file: compensationconsultants1.jpg

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    <FILENAME>dexcomgreenstandalone2.jpg
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    Document 15 - file: dexcomgreenstandalone2.jpg

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    Document 16 - file: doubledmanufacturing1.jpg

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    Document 18 - file: dxcmpc_finalx031921xpagex21.jpg

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    <FILENAME>fdaapproval1.jpg
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    Document 19 - file: fdaapproval1.jpg

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    Document 20 - file: financialexpert1.jpg

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    Document 21 - file: image53.jpg

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    Document 22 - file: increasenewusers1.jpg

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    Document 23 - file: independent1.jpg

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    <FILENAME>industry1.jpg
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    Document 24 - file: industry1.jpg

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    <FILENAME>integrity1.jpg
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    Document 25 - file: integrity1.jpg

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    <FILENAME>internet1.jpg
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    Document 26 - file: internet1.jpg

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    Document 27 - file: listen1.jpg

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    <FILENAME>managementsrole1.jpg
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    Document 28 - file: managementsrole1.jpg

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    Document 29 - file: map1.jpg

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    <FILENAME>marketcapitalization1.jpg
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    Document 30 - file: marketcapitalization1.jpg

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    <SEQUENCE>31
    <FILENAME>meeting1.jpg
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    Document 31 - file: meeting1.jpg

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    <SEQUENCE>32
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    Document 32 - file: ml1.jpg

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    <FILENAME>nominatingandgovernancecoma.jpg
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    Document 33 - file: nominatingandgovernancecoma.jpg

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    Document 34 - file: policiesandprocedures1.jpg

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    Document 35 - file: report1.jpg

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    <SEQUENCE>36
    <FILENAME>responsibility1.jpg
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    Document 36 - file: responsibility1.jpg

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    <SEQUENCE>37
    <FILENAME>responsibility21.jpg
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    Document 37 - file: responsibility21.jpg

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    <FILENAME>responsibility31.jpg
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    Document 38 - file: responsibility31.jpg

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    <FILENAME>responsibility41.jpg
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    Document 39 - file: responsibility41.jpg

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    <SEQUENCE>40
    <FILENAME>revenue1.jpg
    <TEXT>
    Document 40 - file: revenue1.jpg

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    <SEQUENCE>41
    <FILENAME>stockprice2.jpg
    <TEXT>
    Document 41 - file: stockprice2.jpg

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    <SEQUENCE>42
    <FILENAME>technologycommittee3.jpg
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    Document 42 - file: technologycommittee3.jpg

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    <SEQUENCE>43
    <FILENAME>telephone1.jpg
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    Document 43 - file: telephone1.jpg

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    <SEQUENCE>44
    <FILENAME>thinkbig1.jpg
    <TEXT>
    Document 44 - file: thinkbig1.jpg

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    <FILENAME>trgt1.jpg
    <TEXT>
    Document 45 - file: trgt1.jpg

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