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
  PHC308	Blood / Organ donor screening
  PHC309	Evaluation of elevated liver enzymes
  PHC312	Follow-up testing (prior viral hepatitis marker)
  PHC311	Prenatal screening
  PHC313	Screening of asymptomatic patient w/ risk factors
  PHC310	Screening of asymptomatic patient w/o risk factors
  PHC307	Symptoms of acute hepatitis
  PHC1218	Year of birth (1945-1965)

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

  Code	Display
  OTH	Other (specify)
  UNK	Unknown