<xs:simpleType name="CoverageCodeType" >
  <xs:restriction base="xs:string">
    <xs:enumeration value="MD-ALONE"/>
    <xs:enumeration value="MD-DIRECTING"/>
    <xs:enumeration value="CRNA-DIRECTED"/>
    <xs:enumeration value="CRNA-ALONE"/>
    <xs:enumeration value="CRNA-SUPERVISED"/>
    <xs:enumeration value="MD-SUPERVISING"/>
    <xs:enumeration value="CRNA-DIRECTING"/>
    <xs:enumeration value="MD-MD"/>
    <xs:enumeration value="MD-PRESENT BUT NOT DIRECTING"/>
    <xs:enumeration value="CAA-DIRECTED"/>
  </xs:restriction>
</xs:simpleType>