Masked Social Security Number

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Approval Status

  • Approval Status: Approved
  • Example Task Force: 9/5/2019
  • SDWG: 10/10/2019

C-CDA 2.1 Example:

  • US Realm Header: 2.16.840.1.113883.

Reference to full CDA sample:

  • Empty CCD

Validation location


  • This is an example of how to represent a social security number (SSN) that has been masked to show only the last four digits.


  • ONC


  • Lisa R Nelson (GitHub: lisarnelson/C-CDA-Examples


  • social security number, SSN




Example: download example view on GitHub

<?xml version="1.0" encoding="UTF-8"?>
        <!-- Example Social Security Number using the root for the Social Security Administion assigningAuthority. -->
        <id assigningAuthorityName="US Social Security Administration" 
            root="2.16.840.1.113883.4.1" extension="414122222"/>
        <!-- SSN provided, but masked to include only the last 4 characters. -->
        <!-- Note: both examples are shows for comparison. It would not make sense to use both of these options in a real C-CDA Document. -->
        <!-- When recording SSN in the extension dashes (-) are permitted but not required" -->
        <!-- Receiving systems may decide whether to store the last 4 or discard -->
        <!-- an id with a nullFlavor of "MSK" SHALL NOT be used for matching or indexing -->
        <id assigningAuthorityName="US Social Security Administration"         
            root="2.16.840.1.113883.4.1" extension="***-**-2222" nullFlavor="MSK"/>
        <addr use="HP">
            <!-- HP is "primary home" from codeSystem 2.16.840.1.113883.5.1119 -->
            <streetAddressLine>1357 Amber Dr</streetAddressLine>
            <!-- US is "United States" from ISO 3166-1 Country Codes: 1.0.3166.1 -->
        <telecom value="tel:+1(555)-777-1234" use="MC"/>
        <telecom value="tel:+1(555)-723-1544" use="HP"/>
        <!-- HP is "primary home" from HL7 AddressUse 2.16.840.1.113883.5.1119 -->
            <name use="L">
            <administrativeGenderCode code="M" displayName="Male" codeSystem="2.16.840.1.113883.5.1" codeSystemName="AdministrativeGender"/>
            <!-- Date of birth need only be precise to the day -->
            <birthTime value="19800801"/>
            <maritalStatusCode nullFlavor="NI"/>
            <religiousAffiliationCode code="1013" displayName="Christian (non-Catholic, non-specific)" codeSystem="2.16.840.1.113883.5.1076" codeSystemName="HL7 Religious Affiliation"/>
            <raceCode nullFlavor="UNK"/>
            <sdtc:raceCode nullFlavor="UNK"/>
            <ethnicGroupCode nullFlavor="UNK"/>
                <languageCode code="en"/>
                <modeCode code="ESP" displayName="Expressed spoken"
                    codeSystem="2.16.840.1.113883.5.60" codeSystemName="LanguageAbilityMode"/>
                <preferenceInd value="true"/>
            <id extension="99999999" root="2.16.840.1.113883.4.6"/>
            <name>Community Health and Hospitals</name>
            <telecom use="WP" value="tel:+1(555)-555-5000"/>
                <streetAddressLine>1002 Healthcare Dr</streetAddressLine>
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