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
  235856003	Liver disease
  19829001	Lung disease
  90708001	Kidney disease
  370388006	Patient Immunocompromised

• Include these codes as defined in http://terminology.hl7.org/CodeSystem/umls version 20200813

  Code	Display
  C0151453	None of the above

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

  Code	Display
  OTH	Other underlying condition (specify)
  UNK	Unknown