-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 E0IX6jzdLjkBRWVClwaLkQ==

<SEC-DOCUMENT>0000916304-04-000010.txt : 20040210
<SEC-HEADER>0000916304-04-000010.hdr.sgml : 20040210
<ACCEPTANCE-DATETIME>20040210170115
ACCESSION NUMBER:		0000916304-04-000010
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040206
FILED AS OF DATE:		20040210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MASSEY RICHARD J
		CENTRAL INDEX KEY:			0000939094
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23252
		FILM NUMBER:		04582736

	BUSINESS ADDRESS:	
		STREET 1:		IGEN INT INC
		STREET 2:		16020 INDUSTRIAL RD
		CITY:			GAITHERSBURG
		STATE:			MD
		ZIP:			20877
		BUSINESS PHONE:		3019848000

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IGEN INTERNATIONAL INC /DE
		CENTRAL INDEX KEY:			0000916304
		STANDARD INDUSTRIAL CLASSIFICATION:	PATENT OWNERS & LESSORS [6794]
		IRS NUMBER:				942852543
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		16020 INDUSTRIAL DR
		CITY:			GAITHERSBURG
		STATE:			MD
		ZIP:			20877
		BUSINESS PHONE:		3019848000

	MAIL ADDRESS:	
		STREET 1:		16020 INDUSTRIAL DRIVE
		CITY:			GAITHERSBURG
		STATE:			MD
		ZIP:			20877

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	IGEN INC /CA/
		DATE OF NAME CHANGE:	19931216
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4_rjm021004ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-02-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000916304</issuerCik>
        <issuerName>IGEN INTERNATIONAL INC /DE</issuerName>
        <issuerTradingSymbol>IGEN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000939094</rptOwnerCik>
            <rptOwnerName>MASSEY RICHARD J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>IGEN INT INC</rptOwnerStreet1>
            <rptOwnerStreet2>16020 INDUSTRIAL RD</rptOwnerStreet2>
            <rptOwnerCity>GAITHERSBURG</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>20877</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President &amp; COO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-02-06</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2004-02-06</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2637</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>37.91</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>881773</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Option to Buy</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>37.91</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2004-02-06</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2004-02-06</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2637</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>37.91</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2002-06-04</value>
            </exerciseDate>
            <expirationDate>
                <value>2012-06-04</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2637</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Incentive Stock Option granted under the Issuer's 1994 Stock Option Plan.  Option vests 20% one year from the date of grant and then an additional 5% per quarter thereafter.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Richard J. Massey</signatureName>
        <signatureDate>2004-02-10</signatureDate>
    </ownerSignature>
</ownershipDocument>

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