    <SEC-DOCUMENT>0001193125-15-190589-index.html : 20150518
    <SEC-HEADER>0001193125-15-190589.hdr.sgml : 20150518
    <ACCEPTANCE-DATETIME>20150515201513
    ACCESSION NUMBER:		0001193125-15-190589
    CONFORMED SUBMISSION TYPE:	S-1/A
    PUBLIC DOCUMENT COUNT:		14
    FILED AS OF DATE:		20150518
    DATE AS OF CHANGE:		20150515

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			EXAGEN DIAGNOSTICS INC
    		CENTRAL INDEX KEY:			0001274737
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-MEDICAL LABORATORIES [8071]
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			DE

    	FILING VALUES:
    		FORM TYPE:		S-1/A
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-198850
    		FILM NUMBER:		15871479

    	BUSINESS ADDRESS:
    		STREET 1:		1261 LIBERTY WAY
    		CITY:			VISTA
    		STATE:			CA
    		ZIP:			92081
    		BUSINESS PHONE:		(760) 560-1501

    	MAIL ADDRESS:
    		STREET 1:		1261 LIBERTY WAY
    		CITY:			VISTA
    		STATE:			CA
    		ZIP:			92081
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>S-1/A
    <SEQUENCE>1
    <FILENAME>d693329ds1a.htm
    <DESCRIPTION>S-1/A
    <TEXT>
    Document 1 - file: d693329ds1a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23.1
    <SEQUENCE>2
    <FILENAME>d693329dex231.htm
    <DESCRIPTION>EX-23.1
    <TEXT>
    Document 2 - file: d693329dex231.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>g693329g07q40.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: g693329g07q40.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>g693329g12o97.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: g693329g12o97.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>g693329g15a16.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: g693329g15a16.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g693329g17c99.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g693329g17c99.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g693329g18k90.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g693329g18k90.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g693329g21a42.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g693329g21a42.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>g693329g28r54.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g693329g28r54.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>g693329g31f69.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g693329g31f69.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>g693329g67l84.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g693329g67l84.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>g693329g72g81.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g693329g72g81.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g693329g79b67.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g693329g79b67.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g693329g92b06.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g693329g92b06.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>