<xs:simpleType name="ProviderCredentialsCodeType" >
  <xs:restriction base="xs:string">
    <xs:enumeration value="Advanced Practice Nurse"/>
    <xs:enumeration value="Anesthesiologist"/>
    <xs:enumeration value="Certified Anesthesiologist Assistant"/>
    <xs:enumeration value="Certified Registered Nurse Anesthetist"/>
    <xs:enumeration value="Fellow (Anesthesiology)"/>
    <xs:enumeration value="Surgeon"/>
    <xs:enumeration value="Physician Assistant"/>
    <xs:enumeration value="Registered Nurse"/>
    <xs:enumeration value="Resident (Anesthesia)"/>
    <xs:enumeration value="Student Registered Nurse Anesthetist"/>
    <xs:enumeration value="Dentist or Oral Surgeon"/>
    <xs:enumeration value="Podiatrist"/>
  </xs:restriction>
</xs:simpleType>