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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-03-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000885978</issuerCik>
        <issuerName>U S PHYSICAL THERAPY INC /NV</issuerName>
        <issuerTradingSymbol>USPH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001270356</rptOwnerCik>
            <rptOwnerName>READING CHRISTOPHER J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1300 W. SAM HOUSTON PKWY S.</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77042</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-03-04</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>20451</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>88918</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The 20,451 shares of common stock was granted as restricted stock pursuant to the Company's Amended and Restated 2003 Stock Incentive Plan.  Restrictions lapse in 16 equal quarterly installment with the 1,278 shares on April 1, 2019 and thereafter with 1,278 on April 1, July 1, October 1 and January 1 of each year with the final 1,281 shares lapsing on January 1, 2023.</footnote>
        <footnote id="F2">Includes 49,493 shares, inclusive of the 20,451 shares in footnote 1, of restricted stock granted under the Company's equity plans.  Restrictions lapse as to 4,984 shares on each of April 1, 2019, July 1, 2019, October 1, 2019 and January 1, 2020; 3,564 shares on each of April 1, July 1 and October 1, 2020; 3,578 shares on January 1, 2021; 2,543 shares on each of April 1, July 1 and October 1, 2021 and on January 1, 2022; 1,278 on each of April 1, July 1 and October 1, 2022; and 1,281 on January 1, 2023.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Christopher J Reading</signatureName>
        <signatureDate>2019-03-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
