This value set includes codes based on the following rules:

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

  Code	Display
  79899007	Drug Contraindication/Interaction

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

  Code	Display
  PHC1910	Drug Shortage
  PHC1908	Drug Susceptibility Testing Results Already Known
  PHC1909	Suspected Drug Resistance

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

  Code	Display
  OTH	Other (specify)
  UNK	unknown