<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2006-06-08</periodOfReport>

    <dateOfOriginalSubmission>2006-06-12</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000201653</issuerCik>
        <issuerName>DIALYSIS CORP OF AMERICA</issuerName>
        <issuerTradingSymbol>DCAI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001096049</rptOwnerCik>
            <rptOwnerName>EVERETT STEPHEN W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O DIALYSIS CORPORATION OF AMERICA</rptOwnerStreet1>
            <rptOwnerStreet2>1302 CONCOURSE DRIVE, SUITE 204</rptOwnerStreet2>
            <rptOwnerCity>LINTHICUM</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21090</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-06-08</value>
                <footnoteId id="F1"/>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>10000</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>364729</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Date of stockholder approval of an amendment to the Issuer's Stock Option Plan (&quot;Plan&quot;) to provide for the granting of stock awards.</footnote>
        <footnote id="F2">Award of up to 40,000 shares under employment agreement; 10,000 shares vest immediately upon shareholder approval of the amendment to the Plan (see Note 1 above) and 10,000 shares, or a pro-rata portion thereof, vest at the end of each of the next three fiscal years, commencing with 2006, based upon a performance formula.</footnote>
        <footnote id="F3">Amendment reflects corrected symbol for acquisition.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Stephen W. Everett</signatureName>
        <signatureDate>2006-06-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
