Operation Definition

<?xml version="1.0" encoding="UTF-8"?>

<OperationDefinition xmlns="http://hl7.org/fhir">
  <id value="Patient-match"/> 
  <text> 
    <status value="extensions"/> 
    <div xmlns="http://www.w3.org/1999/xhtml">
      <p> URL: [base]/Patient/$match</p> 
      <p> Parameters</p> 
      <table class="grid">
        <tr> 
          <td> 
            <b> Use</b> 
          </td> 
          <td> 
            <b> Name</b> 
          </td> 
          <td> 
            <b> Cardinality</b> 
          </td> 
          <td> 
            <b> Type</b> 
          </td> 
          <td> 
            <b> Binding</b> 
          </td> 
          <td> 
            <b> Documentation</b> 
          </td> 
        </tr> 
        <tr> 
          <td> IN</td> 
          <td> resource</td> 
          <td> 1..1</td> 
          <td> 
            <a href="resource.html">Resource</a> 
          </td> 
          <td/>  
          <td> 
            <div> 
              <p> Use this to provide an entire set of patient details for the MPI to match against (e.g.
                 POST a patient record to Patient/$match).</p> 

            </div> 
          </td> 
        </tr> 
        <tr> 
          <td> IN</td> 
          <td> onlyCertainMatches</td> 
          <td> 0..1</td> 
          <td> 
            <a href="datatypes.html#boolean">boolean</a> 
          </td> 
          <td/>  
          <td> 
            <div> 
              <p> If there are multiple potential matches, then the match should not return the results
                 with this flag set to true.  When false, the server may return multiple results with each
                 result graded accordingly.</p> 

            </div> 
          </td> 
        </tr> 
        <tr> 
          <td> IN</td> 
          <td> count</td> 
          <td> 0..1</td> 
          <td> 
            <a href="datatypes.html#integer">integer</a> 
          </td> 
          <td/>  
          <td> 
            <div> 
              <p> The maximum number of records to return. If no value is provided, the server decides how
                 many matches to return. Note that clients should be careful when using this, as it may
                 prevent probable - and valid - matches from being returned</p> 

            </div> 
          </td> 
        </tr> 
        <tr> 
          <td> OUT</td> 
          <td> return</td> 
          <td> 1..1</td> 
          <td> 
            <a href="bundle.html">Bundle</a> 
          </td> 
          <td/>  
          <td> 
            <div> 
              <p> A bundle contain a set of Patient records that represent possible matches, optionally
                 it may also contain an OperationOutcome with further information about the search results
                 (such as warnings or information messages, such as a count of records that were close
                 but eliminated)  If the operation was unsuccessful, then an OperationOutcome may be returned
                 along with a BadRequest status Code (e.g. security issue, or insufficient properties in
                 patient fragment - check against profile)</p> 

            </div> 
          </td> 
        </tr> 
      </table> 
      <div> 
        <p> The response from an &quot;mpi&quot; query is a bundle containing patient records, ordered
           from most likely to least likely. If there are no patient matches, the MPI SHALL return
           an empty search set with no error, but may include an operation outcome with further advice
           regarding patient selection. All patient records SHALL have a search score from 0 to 1,
           where 1 is the most certain match, along with an extension &quot;
          <a href="extension-match-grade.html">match-grade</a> &quot; that indicates the MPI's position on the match quality.
        </p> 

      </div> 
    </div> 
  </text> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="5"/> 
  </extension> 
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
    <valueCode value="trial-use"/> 
  </extension> 
  <url value="http://hl7.org/fhir/OperationDefinition/Patient-match"/> 
  <version value="5.0.0-ballot"/> 
  <name value="Match"/> 
  <title value="Find patient matches using MPI based logic"/> 
  <status value="draft"/> 
  <kind value="operation"/> 
  <experimental value="false"/> 
  <date value="2022-09-07T10:58:29+10:00"/> 
  <publisher value="HL7 (FHIR Project)"/> 
  <contact> 
    <telecom> 
      <system value="url"/> 
      <value value="http://hl7.org/fhir"/> 
    </telecom> 
    <telecom> 
      <system value="email"/> 
      <value value="fhir@lists.hl7.org"/> 
    </telecom> 
  </contact> 
  <description value="A Master Patient Index ([MPI](http://en.wikipedia.org/wiki/Enterprise_master_patient_index)
   ) is a service used to manage patient identification in a context where multiple patient
   databases exist. Healthcare applications and middleware use the MPI to match patients
   between the databases, and to store new patient details as they are encountered. MPIs
   are highly specialized applications, often tailored extensively to the institution's particular
   mix of patients. MPIs can also be run on a regional and national basis.  

To ask an MPI to match a patient, clients use the &quot;$match&quot; operation, which
   accepts a patient resource which may be only partially complete. The data provided is
   interpreted as an MPI input and processed by an algorithm of some kind that uses the data
   to determine the most appropriate matches in the patient set.  Note that different MPI
   matching algorithms have different required inputs. Consult with the vendor implementing
   the $match operation as to its specific behaviors.

  The generic $match operation does not specify any particular algorithm, nor a minimum
   set of information that must be provided when asking for an MPI match operation to be
   performed, but many implementations will have a set of minimum information, which may
   be declared in their definition of the $match operation by specifying a profile on the
   resource parameter, indicating which properties are required in the search.

The patient resource submitted to the operation does not have to be complete, nor does
   it need to pass validation (i.e. mandatory fields don't need to be populated), but it
   does have to be a valid instance, as it is used as the reference data to match against.

  Implementers of the $match algorithm should consider the relevance of returning inactive
   patients, particularly ones associated with patient merges.

E.g. If an inactive patient is &quot;matched&quot; and its merged target resource will
   be included, then the inactive one may be excluded, however if a patient was just marked
   as inactive for other reasons, it could be included in the results.

(any specific MPI algorithm may or might not behave as in these examples)"/> 
  <affectsState value="false"/> 
  <code value="match"/> 
  <comment value="The response from an &quot;mpi&quot; query is a bundle containing patient records, ordered
   from most likely to least likely. If there are no patient matches, the MPI SHALL return
   an empty search set with no error, but may include an operation outcome with further advice
   regarding patient selection. All patient records SHALL have a search score from 0 to 1,
   where 1 is the most certain match, along with an extension &quot;[match-grade](extension-match-grade
  .html)&quot; that indicates the MPI's position on the match quality."/> 
  <resource value="Patient"/> 
  <system value="false"/> 
  <type value="true"/> 
  <instance value="false"/> 
  <parameter> 
    <name value="resource"/> 
    <use value="in"/> 
    <min value="1"/> 
    <max value="1"/> 
    <documentation value="Use this to provide an entire set of patient details for the MPI to match against (e.g.
     POST a patient record to Patient/$match)."/> 
    <type value="Resource"/> 
  </parameter> 
  <parameter> 
    <name value="onlyCertainMatches"/> 
    <use value="in"/> 
    <min value="0"/> 
    <max value="1"/> 
    <documentation value="If there are multiple potential matches, then the match should not return the results
     with this flag set to true.  When false, the server may return multiple results with each
     result graded accordingly."/> 
    <type value="boolean"/> 
  </parameter> 
  <parameter> 
    <name value="count"/> 
    <use value="in"/> 
    <min value="0"/> 
    <max value="1"/> 
    <documentation value="The maximum number of records to return. If no value is provided, the server decides how
     many matches to return. Note that clients should be careful when using this, as it may
     prevent probable - and valid - matches from being returned"/> 
    <type value="integer"/> 
  </parameter> 
  <parameter> 
    <name value="return"/> 
    <use value="out"/> 
    <min value="1"/> 
    <max value="1"/> 
    <documentation value="A bundle contain a set of Patient records that represent possible matches, optionally
     it may also contain an OperationOutcome with further information about the search results
     (such as warnings or information messages, such as a count of records that were close
     but eliminated)  If the operation was unsuccessful, then an OperationOutcome may be returned
     along with a BadRequest status Code (e.g. security issue, or insufficient properties in
     patient fragment - check against profile)"/> 
    <type value="Bundle"/> 
  </parameter> 
</OperationDefinition>