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

    <schemaVersion>X0607</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2026-09-02</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001692415</issuerCik>
        <issuerName>Co-Diagnostics, Inc.</issuerName>
        <issuerTradingSymbol>CODX</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002154493</rptOwnerCik>
            <rptOwnerName>Bohrer Daniel</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>2401 S. FOOTHILL DR, STE. D</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SALT LAKE CITY</rptOwnerCity>
            <rptOwnerState>UT</rptOwnerState>
            <rptOwnerZipCode>84109</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>EVP of Finance &amp; Accounting</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3657</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Includes 2,722 unvested Restricted stock units (RSUs) awarded to the Reporting Person pursuant to the Co-Diagnostics, Inc. 2015 Long Term Incentive Plan comprised of 2,500 awarded on April 26, 2024 and 2,834 awarded on August 11, 2025, of which 1,667 and 945, respectively, previously vested. Vesting of April 26, 2024 award occurs in equal amounts every six months beginning November 23, 2024 and ending on May 23, 2027.  Vesting of August 11, 2025 award occurs in equal amounts every six months beginning November 23, 2025 and ending on May 23, 2028.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Daniel Bohrer</signatureName>
        <signatureDate>2026-09-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
