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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001204320-08-000003.txt : 20080605
<SEC-HEADER>0001204320-08-000003.hdr.sgml : 20080605
<ACCEPTANCE-DATETIME>20080605141917
ACCESSION NUMBER:		0001204320-08-000003
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080603
FILED AS OF DATE:		20080605
DATE AS OF CHANGE:		20080605

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AMICAS, Inc.
		CENTRAL INDEX KEY:			0001028584
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				592248411
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		20 GUEST STREET
		STREET 2:		SUITE 400
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02135
		BUSINESS PHONE:		617-779-7221

	MAIL ADDRESS:	
		STREET 1:		20 GUEST STREET
		STREET 2:		SUITE 400
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02135

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	VITALWORKS INC
		DATE OF NAME CHANGE:	20010809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	VITAL WORKS INC
		DATE OF NAME CHANGE:	20010806

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INFOCURE CORP
		DATE OF NAME CHANGE:	19961209

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DENELSKY STEPHEN J
		CENTRAL INDEX KEY:			0001204320

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-25311
		FILM NUMBER:		08882665

	BUSINESS ADDRESS:	
		STREET 1:		VITALWORKS INC
		STREET 2:		239 ETHAN ALLEN HIGHWAY
		CITY:			RIDGEFIELD
		STATE:			CT
		ZIP:			06877
		BUSINESS PHONE:		617-779-7878

	MAIL ADDRESS:	
		STREET 1:		C/O AMICAS, INC.
		STREET 2:		20 GUEST STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02135
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-06-03</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001028584</issuerCik>
        <issuerName>AMICAS, Inc.</issuerName>
        <issuerTradingSymbol>amcs</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001204320</rptOwnerCik>
            <rptOwnerName>DENELSKY STEPHEN J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AMICAS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>20 GUEST STREET</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02135</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-06-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5300</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>28152</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">These restricted shares were granted on June 3, 2008 under the AMICAS, Inc. 2006 Stock Incentive Plan (the &quot;Plan&quot;). These restricted shares will vest in full on the earlier of (a) a Reorganization Event (as defined in the Plan); (b) June 3, 2009; and (c) the date of AMICAS' next annual meeting of stockholders.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Kevin C. Burns for Stephen J. DeNelsky</signatureName>
        <signatureDate>2008-06-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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