This value set includes codes based on the following rules:

• Include these codes as defined in urn:oid:2.16.840.1.114222.4.5.274 version 20200526

  Code	Display
  PHC821	0-4 years
  PHC823	19-24 years
  PHC824	25-49 years
  PHC822	5-18 years
  PHC825	50-64 years

• Include these codes as defined in http://snomed.info/sct version http://snomed.info/sct/731000124108/version/20200901

  Code	Display
  102528008	65+ years
  255619001	Total

• Include these codes as defined in http://terminology.hl7.org/CodeSystem/v3-NullFlavor version 20090501

  Code	Display
  UNK	Unknown