<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://example.org/fhir/StructureDefinition/CMSPatient" />
  <name value="CMSPatient" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Patient" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Patient" />
  <derivation value="constraint" />
  <differential>
    <element id="Patient.identifier">
      <path value="Patient.identifier" />
      <label value="http://hl7.org/fhir/sid/us-mbi" />
      <slicing>
        <description value="slice" />
        <rules value="open" />
      </slicing>
      <short value="An identifier for CMS" />
      <min value="1" />
    </element>
    <element id="Patient.identifier:CMS">
      <path value="Patient.identifier" />
      <sliceName value="CMS" />
      <code>
        <system value="http://hl7.org/fhir/sid/us-mbi" />
      </code>
      <min value="1" />
      <max value="1" />
      <mustSupport value="true" />
    </element>
    <element id="Patient.identifier:CMS.system">
      <path value="Patient.identifier.system" />
      <patternUri value="http://hl7.org/fhir/sid/us-mbi" />
      <mustSupport value="true" />
    </element>
  </differential>
</StructureDefinition>