-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 UpKWQ0DOiAheBmyOxbmXTs0K5kuKDIRIqWAwCOeiDweEsLgfkZ7xeIyDv24eAEf2
 pJ8ADIJ25mweN8AGmMz9Pw==

<SEC-DOCUMENT>0001179110-04-006052.txt : 20040315
<SEC-HEADER>0001179110-04-006052.hdr.sgml : 20040315
<ACCEPTANCE-DATETIME>20040315192635
ACCESSION NUMBER:		0001179110-04-006052
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040312
FILED AS OF DATE:		20040315

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			IGSB KEENAN I LLC
		CENTRAL INDEX KEY:			0001279743

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50082
		FILM NUMBER:		04670973

	MAIL ADDRESS:	
		STREET 1:		PO BOX 5609
		CITY:			SANTA BARBARA
		STATE:			CA
		ZIP:			93150

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IMPAC MEDICAL SYSTEMS INC
		CENTRAL INDEX KEY:			0001026448
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				943109238

	BUSINESS ADDRESS:	
		STREET 1:		100 W EVELYN AVE
		CITY:			MOUNTAIN VIEW
		STATE:			CA
		ZIP:			94041
		BUSINESS PHONE:		6506238800

	MAIL ADDRESS:	
		STREET 1:		100 W EVELYN AVE
		CITY:			MOUNTAIN VIEW
		STATE:			CA
		ZIP:			94041
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-03-12</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001026448</issuerCik>
        <issuerName>IMPAC MEDICAL SYSTEMS INC</issuerName>
        <issuerTradingSymbol>IMPCE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001279743</rptOwnerCik>
            <rptOwnerName>IGSB KEENAN I LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1485 EAST VALLEY ROAD, SUITE H</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SANTA BARBARA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>93108</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>13(d) group member - &gt;10%</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-03-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>6500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>22.2014</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>150000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>IGSB-KEENAN I, LLC  By:  IGSB IEP I, L.P., Member,  By:  IGSB, LLC, its General Partner,  By:  s Luise M. Phelps, President</signatureName>
        <signatureDate>2004-03-15</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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