HL7 Electronic Health Record System Functional Model, Release 2.1.1
2.1.1 - Normative

HL7 Electronic Health Record System Functional Model, Release 2.1.1, published by HL7 International / Electronic Health Records. This guide is not an authorized publication; it is the continuous build for version 2.1.1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/ehrsfm-ig/ and changes regularly. See the Directory of published versions

## : TI.3 Registry and Directory Services (Function)

Page standards status: Normative

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        <div id="description"><b>Description <a href="https://hl7.org/fhir/versions.html#std-process" title="Informative Content" class="informative-flag">I</a>:</b> <div><p>Registry and directory service functions are critical to successfully managing the security, interoperability, and the consistency of the health record data across an EHR-S. These services enable the linking of relevant information across multiple information sources within, or external to, an EHR-S for use within an application. This applies to directories/registries internal to the EHR-S as well as directories/registries external to the EHR-S. Transmission may occur automatically or manually and may include small or large amounts of data. Directories and registries support communication between EHR Systems and may be organized hierarchically or in a federated fashion. For example, a patient being treated by a primary care physician for a chronic condition may become ill while out of town. The new provider's EHR-S interrogates a local, regional, or national registry to find the patient's previous records. From the primary care record, a remote EHR-S retrieves relevant information in conformance with applicable patient privacy and confidentiality rules.</p>
    <p>An example of local registry usage is an EHR-S application sending a query message to the Hospital Information System to retrieve a patient's demographic data.</p>
    </div></div>

        <div id="requirements"><b>Criteria <a href="https://hl7.org/fhir/versions.html#std-process" title="Normative Content" class="normative-flag">N</a>:</b></div>

        <table id="statements" class="grid dict">

            <tr>
                <td style="padding-left: 4px;">
                TI.3#01
                </td>
                <td style="padding-left: 4px;">
                SHALL

                </td>
                <td style="padding-left: 4px;" class="requirement">
                    <div><p>The system SHALL provide the ability to manage internal registry services and directories.</p>
    </div>

                </td>
            </tr>

            <tr>
                <td style="padding-left: 4px;">
                TI.3#02
                </td>
                <td style="padding-left: 4px;">
                SHALL

                </td>
                <td style="padding-left: 4px;" class="requirement">
                    <div><p>The system SHALL provide the ability to exchange information with external registry services and directories.</p>
    </div>

                </td>
            </tr>

            <tr>
                <td style="padding-left: 4px;">
                TI.3#03
                </td>
                <td style="padding-left: 4px;">
                SHALL

                </td>
                <td style="padding-left: 4px;" class="requirement">
                    <div><p>The system SHALL provide the ability to exchange information securely with external registry services and directories.</p>
    </div>

                </td>
            </tr>

            <tr>
                <td style="padding-left: 4px;">
                TI.3#04
                </td>
                <td style="padding-left: 4px;">
                SHALL

                </td>
                <td style="padding-left: 4px;" class="requirement">
                    <div><p>The system SHALL conform to function <a href="Requirements-EHRSFMR2-TI.5.1.html">TI.5.1</a> (Application and Structured-Document Interchange Standards) to exchange information with external registry services and directories.</p>
    </div>

                </td>
            </tr>

            <tr>
                <td style="padding-left: 4px;">
                TI.3#05
                </td>
                <td style="padding-left: 4px;">
                SHOULD

                </td>
                <td style="padding-left: 4px;" class="requirement">
                    <div><p>The system SHOULD capture and render local registry services and directory information through standards-based interfaces.</p>
    </div>

                </td>
            </tr>

            <tr>
                <td style="padding-left: 4px;">
                TI.3#06
                </td>
                <td style="padding-left: 4px;">
                SHOULD

                <span style="border-radius: 999px;margin: 2px 2px;font-size: 10px;display: inline-block;padding: 3px 5px;letter-spacing: 0.5px;line-height: 1;white-space: nowrap;background-color: #f3e5ff;color: #7b1fa2;border: 1px solid #d1a3ff;">conditional</span>

                </td>
                <td style="padding-left: 4px;" class="requirement">
                    <div><p>IF the system communicates with external registry services and directories (i.e., external to an EHR-S), THEN the system SHOULD capture and render information using standards-based interfaces.</p>
    </div>

                </td>
            </tr>

            <tr>
                <td style="padding-left: 4px;">
                TI.3#07
                </td>
                <td style="padding-left: 4px;">
                SHOULD

                </td>
                <td style="padding-left: 4px;" class="requirement">
                    <div><p>The system SHOULD provide the ability to determine the unique identity of a patient through the use of internal, and/or external registry services or directories.</p>
    </div>

                </td>
            </tr>

            <tr>
                <td style="padding-left: 4px;">
                TI.3#08
                </td>
                <td style="padding-left: 4px;">
                MAY

                </td>
                <td style="padding-left: 4px;" class="requirement">
                    <div><p>The system MAY provide the ability to determine links to healthcare information regarding a patient through the use of internal, and/or external registry services or directories.</p>
    </div>

                </td>
            </tr>

            <tr>
                <td style="padding-left: 4px;">
                TI.3#09
                </td>
                <td style="padding-left: 4px;">
                MAY

                </td>
                <td style="padding-left: 4px;" class="requirement">
                    <div><p>The system MAY provide the ability to determine the unique identity of a provider through the use of internal, and/or external registry services or directories.</p>
    </div>

                </td>
            </tr>

            <tr>
                <td style="padding-left: 4px;">
                TI.3#10
                </td>
                <td style="padding-left: 4px;">
                MAY

                </td>
                <td style="padding-left: 4px;" class="requirement">
                    <div><p>The system MAY provide the ability to determine the identity of payers, health plans and sponsors for administrative or financial purposes through the use of internal, and/or external registry services or directories.</p>
    </div>

                </td>
            </tr>

            <tr>
                <td style="padding-left: 4px;">
                TI.3#11
                </td>
                <td style="padding-left: 4px;">
                MAY

                </td>
                <td style="padding-left: 4px;" class="requirement">
                    <div><p>The system MAY provide the ability to determine the identity of employers for administrative or financial purposes through the use of internal, and/or external registry services or directories.</p>
    </div>

                </td>
            </tr>

        </table>
    </div>
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      <version value="2.1.1"/>
      <name value="TI_3_Registry_and_Directory_Services"/>
      <title value="TI.3 Registry and Directory Services (Function)"/>
      <status value="active"/>
      <date value="2025-12-13T09:06:06+00:00"/>
      <publisher value="HL7 International / Electronic Health Records"/>
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      <description
                   value="Enable the use of registry services and directories to uniquely identify, locate and supply links for retrieval of information related to:
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    - payers, health plans, sponsors, and employers for administrative and financial purposes;
    - public health agencies for healthcare purposes, and- healthcare resources and devices for resource management purposes."/>
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               value="Registry and directory service functions are critical to successfully managing the security, interoperability, and the consistency of the health record data across an EHR-S. These services enable the linking of relevant information across multiple information sources within, or external to, an EHR-S for use within an application. This applies to directories/registries internal to the EHR-S as well as directories/registries external to the EHR-S. Transmission may occur automatically or manually and may include small or large amounts of data. Directories and registries support communication between EHR Systems and may be organized hierarchically or in a federated fashion. For example, a patient being treated by a primary care physician for a chronic condition may become ill while out of town. The new provider's EHR-S interrogates a local, regional, or national registry to find the patient's previous records. From the primary care record, a remote EHR-S retrieves relevant information in conformance with applicable patient privacy and confidentiality rules.

    An example of local registry usage is an EHR-S application sending a query message to the Hospital Information System to retrieve a patient's demographic data."/>
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