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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001134554-04-000002.txt : 20040423
<SEC-HEADER>0001134554-04-000002.hdr.sgml : 20040423
<ACCEPTANCE-DATETIME>20040423145534
ACCESSION NUMBER:		0001134554-04-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040421
FILED AS OF DATE:		20040423

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MASSARANY HANY
		CENTRAL INDEX KEY:			0001134554

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20931
		FILM NUMBER:		04750726

	BUSINESS ADDRESS:	
		STREET 1:		1910 INNOVATION PARK DR
		CITY:			TUCSON
		STATE:			AZ
		ZIP:			85737

	MAIL ADDRESS:	
		STREET 1:		1910 INNOVATION PARK DR
		CITY:			TUCSON
		STATE:			AZ
		ZIP:			85737

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			VENTANA MEDICAL SYSTEMS INC
		CENTRAL INDEX KEY:			0000893160
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		IRS NUMBER:				942976937
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3865 N BUSINESS CENTER DRIVE
		CITY:			TUCSON
		STATE:			AZ
		ZIP:			85705
		BUSINESS PHONE:		5208872155

	MAIL ADDRESS:	
		STREET 1:		3865 N BUSINESS CENTER DR
		CITY:			TUCSON
		STATE:			AZ
		ZIP:			85705
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
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    <periodOfReport>2004-04-21</periodOfReport>

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        <issuerName>VENTANA MEDICAL SYSTEMS INC</issuerName>
        <issuerTradingSymbol>VMSI</issuerTradingSymbol>
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            <rptOwnerStreet2></rptOwnerStreet2>
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            <isTenPercentOwner>0</isTenPercentOwner>
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            <officerTitle>Sr. Vice President, Global Ops</officerTitle>
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            <transactionDate>
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            <transactionTimeliness>
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            <transactionAmounts>
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                <transactionPricePerShare>
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            <exerciseDate>
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            <expirationDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>568</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>20.24</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <value>2003-01-27</value>
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                <directOrIndirectOwnership>
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            <securityTitle>
                <value>Stock Options (Right to Buy)</value>
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            <conversionOrExercisePrice>
                <value>20.24</value>
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            <transactionDate>
                <value>2004-04-22</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
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                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>7493</value>
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                <transactionPricePerShare>
                    <value>20.24</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <value>2003-01-27</value>
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            <expirationDate>
                <value>2013-01-27</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>7493</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Stock options vest 20% on 5/6/00 and 1/60th of the shares vest the last day of each month thereafter with full vesting on 5/6/04.</footnote>
        <footnote id="F2">Stock options vest 20% on 1/1/01 and 1/60th of the shares vest the last day of each month thereafter with full vesting on 1/1/05.</footnote>
        <footnote id="F3">Stock options vest 20% on 1/22/03 and 1/60th of the shares vest the last day of each month thereafter with full vesting on 1/22/07.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Nicholas Malden as attorney in fact for Hany Massarany</signatureName>
        <signatureDate>2004-04-23</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----